diff --git a/CHANGELOG.md b/CHANGELOG.md
index 69a3cd7..15545de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## [5.4.0](https://github.com/shivam091/unit_measurements/compare/v5.3.0...v5.4.0) - 2023-10-27
+
+### What's new
+
+- Added new units `Å`, `lnk`, `lea`, `hh`, `nl`, and `sft` in length.
+- Added new units `N`, `s`, `drt`, and `lbt` in weight.
+
+----------
+
 ## [5.3.0](https://github.com/shivam091/unit_measurements/compare/v5.2.0...v5.3.0) - 2023-10-24
 
 ### What's new
diff --git a/Gemfile.lock b/Gemfile.lock
index 5323e4e..e6faa3a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    unit_measurements (5.3.0)
+    unit_measurements (5.4.0)
       activesupport (~> 7.0)
 
 GEM
diff --git a/lib/unit_measurements/unit_groups/length.rb b/lib/unit_measurements/unit_groups/length.rb
index 624ec8b..68c268b 100644
--- a/lib/unit_measurements/unit_groups/length.rb
+++ b/lib/unit_measurements/unit_groups/length.rb
@@ -7,19 +7,31 @@
 
   system :metric do
     si_unit "m", aliases: ["meter", "metre", "meters", "metres"]
+
+    unit "Å", value: "1e-10 m", aliases: ["angstrom", "angstroms", "ångström"]
   end
 
   system :imperial do
+    unit "h", value: "4 in", aliases: ["hh", "hand", "hands"]
+
     unit "in", value: "25.4 mm", aliases: ['"', "inch", "inches"]
     unit "ft", value: "12 in", aliases: ["'", "foot", "feet"]
     unit "yd", value: "3 ft", aliases: ["yard", "yards"]
-    unit "mi", value: "1760 yd", aliases: ["mile", "miles", "statute mile", "international mile"]
+    unit "mi", value: "5280 ft", aliases: ["mile", "miles", "statute mile", "international mile"]
     unit "ch", value: "22 yd", aliases: ["chain", "chains"]
-    unit "th", value: "1/1000 in", aliases: ["thou", "thousandth of an inch"]
+    unit "th", value: "1/1000 in", aliases: ["thou", "thousandth of an inch", "mil", "mils"]
+    unit "nl", value: "3 nmi", aliases: ["NL", "nleague", "nleagues", "nautical league", "nautical leagues"]
+
     unit "ftm", value: "6 ft", aliases: ["fathom", "fathoms"]
     unit "fur", value: "220 yd", aliases: ["furlong", "furlongs"]
     unit "nmi", value: "1852 m", aliases: ["NMI", "M", "NM", "nautical mile", "nautical miles"]
     unit "rod", value: "16 1/2 ft", aliases: ["rods", "perch", "pole", "lug"]
+    unit "lnk", value: "33/50 ft", aliases: ["l", "li", "link", "links"]
+    unit "lea", value: "3 mi", aliases: ["league", "leagues"]
+  end
+
+  system :us_customary do
+    unit "sft", value: "1200/3937 m", aliases: ["sfoot", "sfeet", "survey-foot", "survey-feet"]
   end
 
   system :astronomical do
diff --git a/lib/unit_measurements/unit_groups/weight.rb b/lib/unit_measurements/unit_groups/weight.rb
index 3662c19..af884cb 100644
--- a/lib/unit_measurements/unit_groups/weight.rb
+++ b/lib/unit_measurements/unit_groups/weight.rb
@@ -10,27 +10,28 @@
 
     unit "q", value: "100 kg", aliases: ["quintal", "quintals"]
     unit "t", value: "1000 kg", aliases: ["tonne", "tonnes", "metric tonne", "metric tonnes"]
+    unit "N", value: "0.10197162129779283 kg", aliases: ["newton", "newtons"]
+
     unit "ct", value: "200 mg", aliases: ["carat", "carats"]
     unit "Da", value: "1.660538921e-27 kg", aliases: ["dalton", "daltons"]
   end
 
   system :imperial do
-    unit "lb", value: [Rational(45_359_237, 1e+8), "kg"], aliases: ["lbs", "lbm", "pound-mass", "pound", "pounds", "#"]
+    unit "s", value: "20 gr", aliases: ["scruple", "scruples"]
+
+    unit "lb", value: "0.45359237 kg", aliases: ["lbs", "lbm", "pound-mass", "pound", "pounds", "#"]
     unit "st", value: "14 lb", aliases: ["stone", "stones"]
-    unit "oz", value: [Rational(1, 16), "lb"], aliases: ["ounce", "ounces"]
-  end
+    unit "oz", value: "1/16 lb", aliases: ["ounce", "ounces"]
+    unit "dr", value: "1/16 oz", aliases: ["dram", "drams"]
+    unit "gr", value: "1/7000 lb", aliases: ["grain", "grains"]
 
-  system :troy_weight do
-    unit "gr", value: [Rational(1, 7000), "lb"], aliases: ["grain", "grains"]
+    unit "drt", value: "60 gr", aliases: ["troy dram", "troy drams"]
     unit "ozt", value: "480 gr", aliases: ["troy ounce", "troy ounces"]
-    unit "dwt", value: [Rational(1, 20), "ozt"], aliases: ["pennyweight", "pennyweights"]
-  end
-
-  system :avoirdupois do
-    unit "dr", value: [Rational(1, 16), "oz"], aliases: ["dram", "drams"]
+    unit "lbt", value: "5760 gr", aliases: ["troy pound", "troy pounds"]
+    unit "dwt", value: "1/20 ozt", aliases: ["pwt", "pennyweight", "pennyweights"]
   end
 
   system :foot_pound_second do
-    unit "slug", value: "32.1740 lb", aliases: ["slugs"]
+    unit "slug", value: "32.17404856 lb", aliases: ["slugs"]
   end
 end
diff --git a/lib/unit_measurements/version.rb b/lib/unit_measurements/version.rb
index af0185f..c861720 100644
--- a/lib/unit_measurements/version.rb
+++ b/lib/unit_measurements/version.rb
@@ -4,5 +4,5 @@
 
 module UnitMeasurements
   # Current stable version.
-  VERSION = "5.3.0"
+  VERSION = "5.4.0"
 end
diff --git a/spec/unit_measurements/unit_groups/length_spec.rb b/spec/unit_measurements/unit_groups/length_spec.rb
index 63f882c..9e10c2a 100644
--- a/spec/unit_measurements/unit_groups/length_spec.rb
+++ b/spec/unit_measurements/unit_groups/length_spec.rb
@@ -55,6 +55,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(0.198838781515947)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1e+10)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(4.97096953789867)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.000207123730745778)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(9.84251968503937)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.000179985601151908)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(3.28083333333333)
+    end
   end
 
   describe "in" do
@@ -107,6 +131,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(0.00505050505050505)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(2.54e+8)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(0.126262626262626)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(5.26094276094276e-6)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(0.25)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(4.57163426925846e-6)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(0.0833331666666667)
+    end
   end
 
   describe "ft" do
@@ -159,6 +207,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(0.0606060606060606)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(3048000000)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(1.51515151515152)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(6.31313131313131e-5)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(3)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(5.48596112311015e-5)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(0.999998)
+    end
   end
 
   describe "yd" do
@@ -211,6 +283,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(0.181818181818182)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(9.144e+9)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(4.54545454545454)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.000189393939393939)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(9)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.000164578833693305)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(2.999994)
+    end
   end
 
   describe "mi" do
@@ -263,6 +359,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(320)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1.609344e+13)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(8000)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.333333333333333)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(15840)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.289658747300216)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(5279.98944)
+    end
   end
 
   describe "ch" do
@@ -315,6 +435,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(4)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(2.01168e+11)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(100)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.00416666666666667)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(198)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.0036207343412527)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(65.999868)
+    end
   end
 
   describe "th" do
@@ -367,6 +511,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(5.05050505050505e-6)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(254000)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(0.000126262626262626)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(5.26094276094276e-9)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(0.00025)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(4.57163426925846e-9)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(8.33331666666667e-5)
+    end
   end
 
   describe "au" do
@@ -419,6 +587,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(2.97458583273682e+10)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1.495978707e+21)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(7.43646458184204e+11)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(3.09852690910085e+7)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(1.47241998720472e+12)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(2.69254626889849e+7)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(4.9080568078825e+11)
+    end
   end
 
   describe "pc" do
@@ -471,6 +663,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(6.13552370454817e+15)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(3.08567758149137e+26)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(1.53388092613704e+17)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(6.39117052557101e+12)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(3.03708423375135e+17)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(5.55377534465689e+12)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(1.01235938652763e+17)
+    end
   end
 
   describe "ftm" do
@@ -523,6 +739,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(0.363636363636364)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1.8288e+10)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(9.09090909090909)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.000378787878787879)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(18)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.000329157667386609)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(5.999988)
+    end
   end
 
   describe "fur" do
@@ -575,6 +815,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(40)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(2.011680000000e+12)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(1000)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.0416666666666667)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(1980)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.036207343412527)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(659.99868)
+    end
   end
 
   describe "nmi" do
@@ -627,6 +891,30 @@
     it "converts to rod" do
       expect(subject.convert_to("rod").quantity).to eq(368.249423367534)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1.852e+13)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(9206.23558418834)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.383593149341181)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(18228.3464566929)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.333333333333333)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(6076.10333333333)
+    end
   end
 
   describe "rod" do
@@ -679,5 +967,485 @@
     it "converts to nmi" do
       expect(subject.convert_to("nmi").quantity).to eq(0.00271555075593952)
     end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(5.0292e+10)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(25)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(0.00104166666666667)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(49.5)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.000905183585313175)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(16.499967)
+    end
+  end
+
+  describe "Å" do
+    subject { described_class.new(1, "Å") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(1e-10)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(3.93700787401575e-9)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(3.28083989501312e-10)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(1.09361329833771e-10)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(6.21371192237334e-14)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(4.97096953789867e-12)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(3.93700787401575e-6)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(6.68458712226845e-22)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(3.24077928944437e-27)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(5.46806649168854e-11)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(4.97096953789867e-13)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(5.39956803455724e-14)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(1.98838781515947e-11)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(4.97096953789867e-10)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(2.07123730745778e-14)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(9.84251968503937e-10)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(1.79985601151908e-14)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(3.28083333333333e-10)
+    end
+  end
+
+  describe "lnk" do
+    subject { described_class.new(1, "lnk") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(0.201168)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(7.92)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(0.66)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(0.22)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(0.000125)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(0.01)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(7920)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(1.3447250222125e-12)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(6.51941088098944e-18)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(0.11)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(0.001)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(0.000108622030237581)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(0.04)
+    end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(2.01168e+9)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(4.16666666666667e-5)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(1.98)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(3.6207343412527e-5)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(0.65999868)
+    end
+  end
+
+  describe "lea" do
+    subject { described_class.new(1, "lea") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(4828.032)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(1.9008e+5)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(15840)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(5280)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(3)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(240)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(1.9008e+8)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(3.22734005331e-8)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(1.56465861143747e-13)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(2640)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(24)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(2.60692872570194)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(960)
+    end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(4.828032e+13)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(24000)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(47520)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(0.868976241900648)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(15839.96832)
+    end
+  end
+
+  describe "h" do
+    subject { described_class.new(1, "hh") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(0.1016)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(4)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(0.333333333333333)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(0.111111111111111)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(6.31313131313131e-5)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(0.00505050505050505)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(4000)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(6.79154051622474e-13)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(3.29263175807547e-18)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(0.0555555555555556)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(0.000505050505050505)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(5.48596112311015e-5)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(0.0202020202020202)
+    end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(1.016e+9)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(0.505050505050505)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(2.1043771043771e-5)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(1.82865370770338e-5)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(0.333332666666667)
+    end
+  end
+
+  describe "nl" do
+    subject { described_class.new(1, "nl") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(5556)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(2.18740157480315e+5)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(18228.3464566929)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(6076.11548556431)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(3.45233834407063)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(276.18706752565)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(2.18740157480315e+8)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(3.71395660513235e-8)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(1.80057697321529e-13)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(3038.05774278215)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(27.618706752565)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(3)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(1104.7482701026)
+    end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(5.556e+13)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(27618.706752565)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(1.15077944802354)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(54685.0393700787)
+    end
+
+    it "converts to sft" do
+      expect(subject.convert_to("sft").quantity).to eq(18228.31)
+    end
+  end
+
+  describe "sft" do
+    subject { described_class.new(1, "sft") }
+
+    it "converts to m" do
+      expect(subject.convert_to("m").quantity).to eq(0.304800609601219)
+    end
+
+    it "converts to in" do
+      expect(subject.convert_to("in").quantity).to eq(12.000024000048)
+    end
+
+    it "converts to ft" do
+      expect(subject.convert_to("ft").quantity).to eq(1.000002000004)
+    end
+
+    it "converts to yd" do
+      expect(subject.convert_to("yd").quantity).to eq(0.333334000001333)
+    end
+
+    it "converts to mi" do
+      expect(subject.convert_to("mi").quantity).to eq(0.000189394318182576)
+    end
+
+    it "converts to ch" do
+      expect(subject.convert_to("ch").quantity).to eq(0.0151515454546061)
+    end
+
+    it "converts to th" do
+      expect(subject.convert_to("th").quantity).to eq(12000.024000048)
+    end
+
+    it "converts to au" do
+      expect(subject.convert_to("au").quantity).to eq(2.03746622979988e-12)
+    end
+
+    it "converts to pc" do
+      expect(subject.convert_to("pc").quantity).to eq(9.87791503005648e-18)
+    end
+
+    it "converts to ftm" do
+      expect(subject.convert_to("ftm").quantity).to eq(0.166667000000667)
+    end
+
+    it "converts to fur" do
+      expect(subject.convert_to("fur").quantity).to eq(0.00151515454546061)
+    end
+
+    it "converts to nmi" do
+      expect(subject.convert_to("nmi").quantity).to eq(0.00016457916285163)
+    end
+
+    it "converts to rod" do
+      expect(subject.convert_to("rod").quantity).to eq(0.0606061818184242)
+    end
+
+    it "converts to Å" do
+      expect(subject.convert_to("Å").quantity).to eq(3.04800609601219e+9)
+    end
+
+    it "converts to lnk" do
+      expect(subject.convert_to("lnk").quantity).to eq(1.51515454546061)
+    end
+
+    it "converts to lea" do
+      expect(subject.convert_to("lea").quantity).to eq(6.31314393941919e-5)
+    end
+
+    it "converts to hh" do
+      expect(subject.convert_to("h").quantity).to eq(3.000006000012)
+    end
+
+    it "converts to nl" do
+      expect(subject.convert_to("nl").quantity).to eq(5.48597209505434e-5)
+    end
   end
 end
diff --git a/spec/unit_measurements/unit_groups/weight_spec.rb b/spec/unit_measurements/unit_groups/weight_spec.rb
index 7c5e3c9..b736119 100644
--- a/spec/unit_measurements/unit_groups/weight_spec.rb
+++ b/spec/unit_measurements/unit_groups/weight_spec.rb
@@ -53,7 +53,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.000137043738537252)
+      expect(subject.convert_to("slug").quantity).to eq(0.000137043531698379)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.0196133)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(1.54323583529414)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.514411945098048)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.005358457761438)
     end
   end
 
@@ -105,7 +121,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(13.7043738537252)
+      expect(subject.convert_to("slug").quantity).to eq(13.7043531698379)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(1961.33)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(1.54323583529414e+5)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(51441.1945098048)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(535.8457761438)
     end
   end
 
@@ -157,7 +189,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(137.043738537252)
+      expect(subject.convert_to("slug").quantity).to eq(137.043531698379)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(19613.3)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(1.54323583529414e+6)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(5.14411945098048e+5)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(5358.457761438)
     end
   end
 
@@ -209,7 +257,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(2.74087477074504e-5)
+      expect(subject.convert_to("slug").quantity).to eq(2.74087063396758e-05)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.00392266)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(0.308647167058829)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.10288238901961)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.0010716915522876)
     end
   end
 
@@ -261,7 +325,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(2.27566461720455e-28)
+      expect(subject.convert_to("slug").quantity).to eq(2.27566118256456e-28)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(3.25686480192493e-26)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(2.56260316878787e-24)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(8.54201056262623e-25)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(8.89792766940233e-27)
     end
   end
 
@@ -313,7 +393,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(8.88028487953894e-6)
+      expect(subject.convert_to("slug").quantity).to eq(8.88027147660542e-06)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.001270920461503)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(0.1)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.0333333333333333)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.000347222222222222)
     end
   end
 
@@ -365,7 +461,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.0621619941567726)
+      expect(subject.convert_to("slug").quantity).to eq(0.0621619003362379)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(8.896443230521)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(700)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(233.333333333333)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(2.43055555555556)
     end
   end
 
@@ -417,7 +529,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.00388512463479828)
+      expect(subject.convert_to("slug").quantity).to eq(0.00388511877101487)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.556027701907562)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(43.75)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(14.5833333333333)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.151909722222222)
     end
   end
 
@@ -469,7 +597,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.870267918194816)
+      expect(subject.convert_to("slug").quantity).to eq(0.870266604707331)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(124.550205227294)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(9800)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(3266.66666666667)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(34.0277777777778)
     end
   end
 
@@ -521,7 +665,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.000242820289674893)
+      expect(subject.convert_to("slug").quantity).to eq(0.000242819923188429)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.0347517313692227)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(2.734375)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.911458333333333)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.00949435763888889)
     end
   end
 
@@ -573,7 +733,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.00426253674217869)
+      expect(subject.convert_to("slug").quantity).to eq(0.0042625303087706)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.61004182152144)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(48)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(16)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.166666666666667)
     end
   end
 
@@ -625,7 +801,23 @@
     end
 
     it "converts to slug" do
-      expect(subject.convert_to("slug").quantity).to eq(0.000213126837108934)
+      expect(subject.convert_to("slug").quantity).to eq(0.00021312651543853)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.030502091076072)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(2.4)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.8)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.00833333333333333)
     end
   end
 
@@ -633,51 +825,339 @@
     subject { described_class.new(2, "slug") }
 
     it "converts to g" do
-      expect(subject.convert_to("g").quantity).to eq(29187.76182476)
+      expect(subject.convert_to("g").quantity).to eq(29187.805877651)
+    end
+
+    it "converts to q" do
+      expect(subject.convert_to("q").quantity).to eq(0.29187805877651)
+    end
+
+    it "converts to t" do
+      expect(subject.convert_to("t").quantity).to eq(0.029187805877651)
+    end
+
+    it "converts to st" do
+      expect(subject.convert_to("st").quantity).to eq(4.59629265142857)
+    end
+
+    it "converts to oz" do
+      expect(subject.convert_to("oz").quantity).to eq(1029.56955392)
+    end
+
+    it "converts to ct" do
+      expect(subject.convert_to("ct").quantity).to eq(1.45939029388255e+5)
+    end
+
+    it "converts to dr" do
+      expect(subject.convert_to("dr").quantity).to eq(16473.11286272)
+    end
+
+    it "converts to Da" do
+      expect(subject.convert_to("Da").quantity).to eq(1.75773090943714e+28)
+    end
+
+    it "converts to lb" do
+      expect(subject.convert_to("lb").quantity).to eq(64.34809712)
+    end
+
+    it "converts to gr" do
+      expect(subject.convert_to("gr").quantity).to eq(4.5043667984e+5)
+    end
+
+    it "converts to dwt" do
+      expect(subject.convert_to("dwt").quantity).to eq(18768.1949933333)
+    end
+
+    it "converts to ozt" do
+      expect(subject.convert_to("ozt").quantity).to eq(938.409749666667)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(286.234596510066)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(22521.833992)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(7507.27799733333)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(78.2008124722222)
+    end
+  end
+
+  describe "N" do
+    subject { described_class.new(2, "N") }
+
+    it "converts to g" do
+      expect(subject.convert_to("g").quantity).to eq(203.943242595586)
+    end
+
+    it "converts to q" do
+      expect(subject.convert_to("q").quantity).to eq(0.00203943242595586)
+    end
+
+    it "converts to t" do
+      expect(subject.convert_to("t").quantity).to eq(0.000203943242595586)
+    end
+
+    it "converts to st" do
+      expect(subject.convert_to("st").quantity).to eq(0.0321155632999586)
+    end
+
+    it "converts to oz" do
+      expect(subject.convert_to("oz").quantity).to eq(7.19388617919074)
+    end
+
+    it "converts to ct" do
+      expect(subject.convert_to("ct").quantity).to eq(1019.71621297793)
+    end
+
+    it "converts to dr" do
+      expect(subject.convert_to("dr").quantity).to eq(115.102178867052)
+    end
+
+    it "converts to Da" do
+      expect(subject.convert_to("Da").quantity).to eq(1.22817502207517e+26)
+    end
+
+    it "converts to lb" do
+      expect(subject.convert_to("lb").quantity).to eq(0.449617886199421)
+    end
+
+    it "converts to gr" do
+      expect(subject.convert_to("gr").quantity).to eq(3147.32520339595)
+    end
+
+    it "converts to dwt" do
+      expect(subject.convert_to("dwt").quantity).to eq(131.138550141498)
+    end
+
+    it "converts to ozt" do
+      expect(subject.convert_to("ozt").quantity).to eq(6.55692750707489)
+    end
+
+    it "converts to slug" do
+      expect(subject.convert_to("slug").quantity).to eq(0.0139745511156592)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(157.366260169797)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(52.4554200565991)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.546410625589574)
+    end
+  end
+
+  describe "s" do
+    subject { described_class.new(2, "s") }
+
+    it "converts to g" do
+      expect(subject.convert_to("g").quantity).to eq(2.5919564)
+    end
+
+    it "converts to q" do
+      expect(subject.convert_to("q").quantity).to eq(2.5919564e-5)
+    end
+
+    it "converts to t" do
+      expect(subject.convert_to("t").quantity).to eq(2.5919564e-6)
+    end
+
+    it "converts to st" do
+      expect(subject.convert_to("st").quantity).to eq(0.000408163265306122)
+    end
+
+    it "converts to oz" do
+      expect(subject.convert_to("oz").quantity).to eq(0.0914285714285714)
+    end
+
+    it "converts to ct" do
+      expect(subject.convert_to("ct").quantity).to eq(12.959782)
+    end
+
+    it "converts to dr" do
+      expect(subject.convert_to("dr").quantity).to eq(1.46285714285714)
+    end
+
+    it "converts to Da" do
+      expect(subject.convert_to("Da").quantity).to eq(1.56091276586223e+24)
+    end
+
+    it "converts to lb" do
+      expect(subject.convert_to("lb").quantity).to eq(0.00571428571428571)
+    end
+
+    it "converts to gr" do
+      expect(subject.convert_to("gr").quantity).to eq(40)
+    end
+
+    it "converts to dwt" do
+      expect(subject.convert_to("dwt").quantity).to eq(1.66666666666667)
+    end
+
+    it "converts to ozt" do
+      expect(subject.convert_to("ozt").quantity).to eq(0.0833333333333333)
+    end
+
+    it "converts to slug" do
+      expect(subject.convert_to("slug").quantity).to eq(0.000177605429532108)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.02541840923006)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(0.666666666666667)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.00694444444444444)
+    end
+  end
+
+  describe "drt" do
+    subject { described_class.new(2, "drt") }
+
+    it "converts to g" do
+      expect(subject.convert_to("g").quantity).to eq(7.7758692)
     end
 
     it "converts to q" do
-      expect(subject.convert_to("q").quantity).to eq(0.2918776182476)
+      expect(subject.convert_to("q").quantity).to eq(7.7758692e-5)
     end
 
     it "converts to t" do
-      expect(subject.convert_to("t").quantity).to eq(0.02918776182476)
+      expect(subject.convert_to("t").quantity).to eq(7.7758692e-6)
     end
 
     it "converts to st" do
-      expect(subject.convert_to("st").quantity).to eq(4.59628571428571)
+      expect(subject.convert_to("st").quantity).to eq(0.00122448979591837)
     end
 
     it "converts to oz" do
-      expect(subject.convert_to("oz").quantity).to eq(1029.568)
+      expect(subject.convert_to("oz").quantity).to eq(0.274285714285714)
     end
 
     it "converts to ct" do
-      expect(subject.convert_to("ct").quantity).to eq(1.459388091238e+5)
+      expect(subject.convert_to("ct").quantity).to eq(38.879346)
     end
 
     it "converts to dr" do
-      expect(subject.convert_to("dr").quantity).to eq(1.6473088e+4)
+      expect(subject.convert_to("dr").quantity).to eq(4.38857142857143)
     end
 
     it "converts to Da" do
-      expect(subject.convert_to("Da").quantity).to eq(1.7577282565098e+28)
+      expect(subject.convert_to("Da").quantity).to eq(4.6827382975867e+24)
     end
 
     it "converts to lb" do
-      expect(subject.convert_to("lb").quantity).to eq(64.348)
+      expect(subject.convert_to("lb").quantity).to eq(0.0171428571428571)
     end
 
     it "converts to gr" do
-      expect(subject.convert_to("gr").quantity).to eq(4.50436e+5)
+      expect(subject.convert_to("gr").quantity).to eq(120)
     end
 
     it "converts to dwt" do
-      expect(subject.convert_to("dwt").quantity).to eq(18768.1666666667)
+      expect(subject.convert_to("dwt").quantity).to eq(5)
     end
 
     it "converts to ozt" do
-      expect(subject.convert_to("ozt").quantity).to eq(938.408333333333)
+      expect(subject.convert_to("ozt").quantity).to eq(0.25)
+    end
+
+    it "converts to slug" do
+      expect(subject.convert_to("slug").quantity).to eq(0.000532816288596325)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(0.07625522769018)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(6)
+    end
+
+    it "converts to lbt" do
+      expect(subject.convert_to("lbt").quantity).to eq(0.0208333333333333)
+    end
+  end
+
+  describe "lbt" do
+    subject { described_class.new(2, "lbt") }
+
+    it "converts to g" do
+      expect(subject.convert_to("g").quantity).to eq(746.4834432)
+    end
+
+    it "converts to q" do
+      expect(subject.convert_to("q").quantity).to eq(0.007464834432)
+    end
+
+    it "converts to t" do
+      expect(subject.convert_to("t").quantity).to eq(0.0007464834432)
+    end
+
+    it "converts to st" do
+      expect(subject.convert_to("st").quantity).to eq(0.117551020408163)
+    end
+
+    it "converts to oz" do
+      expect(subject.convert_to("oz").quantity).to eq(26.3314285714286)
+    end
+
+    it "converts to ct" do
+      expect(subject.convert_to("ct").quantity).to eq(3732.417216)
+    end
+
+    it "converts to dr" do
+      expect(subject.convert_to("dr").quantity).to eq(421.302857142857)
+    end
+
+    it "converts to Da" do
+      expect(subject.convert_to("Da").quantity).to eq(4.49542876568323e+26)
+    end
+
+    it "converts to lb" do
+      expect(subject.convert_to("lb").quantity).to eq(1.64571428571429)
+    end
+
+    it "converts to gr" do
+      expect(subject.convert_to("gr").quantity).to eq(11520)
+    end
+
+    it "converts to dwt" do
+      expect(subject.convert_to("dwt").quantity).to eq(480)
+    end
+
+    it "converts to ozt" do
+      expect(subject.convert_to("ozt").quantity).to eq(24)
+    end
+
+    it "converts to slug" do
+      expect(subject.convert_to("slug").quantity).to eq(0.0511503637052472)
+    end
+
+    it "converts to N" do
+      expect(subject.convert_to("N").quantity).to eq(7.32050185825728)
+    end
+
+    it "converts to s" do
+      expect(subject.convert_to("s").quantity).to eq(576)
+    end
+
+    it "converts to drt" do
+      expect(subject.convert_to("drt").quantity).to eq(192)
     end
   end
 end
diff --git a/units.md b/units.md
index 1e6a715..7251a1c 100644
--- a/units.md
+++ b/units.md
@@ -9,27 +9,33 @@ check below list of bundled units before converting your measurements.
 in addition to [Decimal SI prefixes](README.md#decimal-si-prefixes).
 3. Primitive unit of the unit group is in _emphasised typeface_.
 
-## 1. Length/Distance
+## 1. Length or distance
 
 These units are defined in `UnitMeasurements::Length`.
 
 | # | Name | Aliases |
 |:--|:--|:--|
 | _1_ | _m*_ | _meter, metre, meters, metres_ |
-| 2 | in | ", inch, inches |
-| 3 | ft | ', foot, feet |
-| 4 | yd | yard, yards |
-| 5 | mi | mile, miles, statute mile, international mile |
-| 6 | ch | chain, chains |
-| 7 | th | thou, thousandth of an inch |
-| 8 | au | astronomical unit, astronomical units |
-| 9 | pc | parsec, parsecs |
-| 10 | ftm | fathom, fathoms |
-| 11 | fur | furlong, furlongs |
-| 12 | nmi | NMI, M, NM, nautical mile, nautical miles |
-| 13 | rod | rods, perch, pole, lug |
-
-## 2. Weight/Mass
+| 2 | Å | angstrom, angstroms, ångström |
+| 3 | h | hh, hand, hands |
+| 4 | in | ", inch, inches |
+| 5 | ft | ', foot, feet |
+| 6 | yd | yard, yards |
+| 7 | mi | mile, miles, statute mile, international mile |
+| 8 | ch | chain, chains |
+| 9 | th | thou, thousandth of an inch, mil, mils |
+| 10 | au | astronomical unit, astronomical units |
+| 11 | pc | parsec, parsecs |
+| 12 | nl | NL, nleague, nleagues, nautical league, nautical leagues |
+| 13 | ftm | fm, fathom, fathoms |
+| 14 | fur | furlong, furlongs |
+| 15 | nmi | NMI, M, NM, nautical mile, nautical miles |
+| 16 | rod | rods, perch, pole, lug |
+| 17 | lnk | l, li, link, links |
+| 18 | lea | league, leagues |
+| 19 | sft | sfoot, sfeet, survey-foot, survey-feet |
+
+## 2. Weight or mass
 
 These units are defined in `UnitMeasurements::Weight`.
 
@@ -38,16 +44,20 @@ These units are defined in `UnitMeasurements::Weight`.
 | _1_ | _g*_ | _gram, grams, gramme, grammes_ |
 | 2 | q | quintal, quintals |
 | 3 | t | tonne, tonnes, metric tonne, metric tonnes |
-| 4 | ct | carat, carats |
-| 5 | Da | dalton, daltons |
-| 6 | st | stone, stones |
-| 7 | dr | dram, drams |
-| 8 | dwt | pennyweight, pennyweights |
-| 9 | ozt | troy ounce, troy ounces |
-| 10 | slug | slugs |
-| 11 | lb | lbs, lbm, pound-mass, pound, pounds, \# |
-| 12 | oz | ounce, ounces |
-| 13 | gr | grain, grains |
+| 4 | N | newton, newtons |
+| 5 | s | scruple, scruples |
+| 6 | ct | carat, carats |
+| 7 | Da | dalton, daltons |
+| 8 | st | stone, stones |
+| 9 | dr | dram, drams |
+| 10 | lb | lbs, lbm, pound-mass, pound, pounds, \# |
+| 11 | oz | ounce, ounces |
+| 12 | gr | grain, grains |
+| 13 | dwt | pennyweight, pennyweights |
+| 14 | ozt | troy ounce, troy ounces |
+| 15 | lbt | troy pound, troy pounds |
+| 16 | drt | troy dram, troy drams |
+| 17 | slug | slugs |
 
 ## 3. Time