diff --git a/src/main/java/org/gradle/profiler/report/JsonResultWriter.java b/src/main/java/org/gradle/profiler/report/JsonResultWriter.java
index 2c25a83d..1e958f1c 100644
--- a/src/main/java/org/gradle/profiler/report/JsonResultWriter.java
+++ b/src/main/java/org/gradle/profiler/report/JsonResultWriter.java
@@ -96,6 +96,7 @@ private <T extends BuildInvocationResult> JsonObject serializeScenarioResult(Bui
     private JsonObject serializeSample(BuildScenarioResult<? extends BuildInvocationResult> scenarioResult, Sample<?> sample) {
         JsonObject json = new JsonObject();
         json.addProperty("name", sample.getName());
+        json.addProperty("unit", sample.getUnit());
         return json;
     }
 
diff --git a/src/main/java/org/gradle/profiler/result/Sample.java b/src/main/java/org/gradle/profiler/result/Sample.java
index 0d2ffbe0..d1609c21 100644
--- a/src/main/java/org/gradle/profiler/result/Sample.java
+++ b/src/main/java/org/gradle/profiler/result/Sample.java
@@ -3,5 +3,7 @@
 public interface Sample<T extends BuildInvocationResult> {
     String getName();
 
+    String getUnit();
+
     double extractFrom(T result);
 }
diff --git a/src/main/java/org/gradle/profiler/result/TimeSample.java b/src/main/java/org/gradle/profiler/result/TimeSample.java
index d662b312..8860eabb 100644
--- a/src/main/java/org/gradle/profiler/result/TimeSample.java
+++ b/src/main/java/org/gradle/profiler/result/TimeSample.java
@@ -4,6 +4,11 @@
 
 public abstract class TimeSample<T extends BuildInvocationResult> implements Sample<T> {
 
+    @Override
+    public String getUnit() {
+        return "ms";
+    }
+
     @Override
     public double extractFrom(T result) {
         return getDuration(result).toNanos() / 1000000d;
diff --git a/src/main/js/org/gradle/profiler/report/report.js b/src/main/js/org/gradle/profiler/report/report.js
index 5c5960f1..55b4bdeb 100644
--- a/src/main/js/org/gradle/profiler/report/report.js
+++ b/src/main/js/org/gradle/profiler/report/report.js
@@ -156,7 +156,6 @@ new Vue({
                 sample.color = `hsl(${scenarioIndex * 360 / scenarios.length}, ${100 - 80 * sampleIndex / samples.length}%, ${30 + 40 * sampleIndex / samples.length}%)`;
                 sample.thickness = sampleIndex === 0 ? 3 : 2;
                 sample.selected = sampleIndex === 0;
-                sample.unit = "ms";
                 const data = measuredIterations(scenario).map(iteration => iteration.values[sample.name]);
                 OPERATIONS.forEach(operation => sample[operation.name] = operation.apply(data));
             });
diff --git a/src/test/groovy/org/gradle/profiler/report/JsonResultWriterTest.groovy b/src/test/groovy/org/gradle/profiler/report/JsonResultWriterTest.groovy
index aa7bb3d1..c0777282 100644
--- a/src/test/groovy/org/gradle/profiler/report/JsonResultWriterTest.groovy
+++ b/src/test/groovy/org/gradle/profiler/report/JsonResultWriterTest.groovy
@@ -138,10 +138,12 @@ class JsonResultWriterTest extends Specification {
       },
       "samples": [
         {
-          "name": "execution"
+          "name": "execution",
+          "unit": "ms"
         },
         {
-          "name": "Test sample"
+          "name": "Test sample",
+          "unit": "ms"
         }
       ],
       "iterations": [
@@ -236,10 +238,12 @@ class JsonResultWriterTest extends Specification {
       },
       "samples": [
         {
-          "name": "execution"
+          "name": "execution",
+          "unit": "ms"
         },
         {
-          "name": "Test sample"
+          "name": "Test sample",
+          "unit": "ms"
         }
       ],
       "iterations": [
diff --git a/src/test/resources/org/gradle/profiler/report/example-regression.json b/src/test/resources/org/gradle/profiler/report/example-regression.json
index e1dde693..b97fb18b 100644
--- a/src/test/resources/org/gradle/profiler/report/example-regression.json
+++ b/src/test/resources/org/gradle/profiler/report/example-regression.json
@@ -45,7 +45,7 @@
         "samples": [
           {
             "name": "execution",
-            "confidence": 0.0
+            "unit": "ms"
           }
         ],
         "iterations": [
@@ -289,7 +289,7 @@
         "samples": [
           {
             "name": "execution",
-            "confidence": 0.9991642831782728
+            "unit": "ms"
           }
         ],
         "iterations": [
diff --git a/src/test/resources/org/gradle/profiler/report/example-single.json b/src/test/resources/org/gradle/profiler/report/example-single.json
index a56398fb..c9e6e473 100644
--- a/src/test/resources/org/gradle/profiler/report/example-single.json
+++ b/src/test/resources/org/gradle/profiler/report/example-single.json
@@ -45,7 +45,7 @@
       "samples": [
         {
           "name": "execution",
-          "confidence": 0.0
+          "unit": "ms"
         }
       ],
       "iterations": [
diff --git a/src/test/resources/org/gradle/profiler/report/example-with-build-operations.json b/src/test/resources/org/gradle/profiler/report/example-with-build-operations.json
index 684506e9..1bb53ce0 100644
--- a/src/test/resources/org/gradle/profiler/report/example-with-build-operations.json
+++ b/src/test/resources/org/gradle/profiler/report/example-with-build-operations.json
@@ -45,39 +45,39 @@
       "samples": [
         {
           "name": "execution",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "ResolveConfigurationDependenciesBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "DefaultTransformer$FingerprintTransformInputsOperation",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "CaptureStateBeforeExecutionStep$Operation",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "BuildCacheArchivePackBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "BuildCacheArchiveUnpackBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "SnapshotOutputsStep$Operation",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "ExecuteTaskActionBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "ExecuteTaskBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         }
       ],
       "iterations": [
@@ -497,39 +497,39 @@
       "samples": [
         {
           "name": "execution",
-          "confidence": 0.9991642831782728
+          "unit": "ms"
         },
         {
           "name": "ResolveConfigurationDependenciesBuildOperationType",
-          "confidence": 0.7023232455278197
+          "unit": "ms"
         },
         {
           "name": "DefaultTransformer$FingerprintTransformInputsOperation",
-          "confidence": 0.13956902626472267
+          "unit": "ms"
         },
         {
           "name": "CaptureStateBeforeExecutionStep$Operation",
-          "confidence": 0.9999999011729629
+          "unit": "ms"
         },
         {
           "name": "BuildCacheArchivePackBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "BuildCacheArchiveUnpackBuildOperationType",
-          "confidence": 0.0
+          "unit": "ms"
         },
         {
           "name": "SnapshotOutputsStep$Operation",
-          "confidence": 0.10758613603151901
+          "unit": "ms"
         },
         {
           "name": "ExecuteTaskActionBuildOperationType",
-          "confidence": 0.18185053861180012
+          "unit": "ms"
         },
         {
           "name": "ExecuteTaskBuildOperationType",
-          "confidence": 0.9999987143919465
+          "unit": "ms"
         }
       ],
       "iterations": [
diff --git a/src/test/resources/org/gradle/profiler/report/example.json b/src/test/resources/org/gradle/profiler/report/example.json
index 2c0681a5..cdb8eca5 100644
--- a/src/test/resources/org/gradle/profiler/report/example.json
+++ b/src/test/resources/org/gradle/profiler/report/example.json
@@ -45,7 +45,7 @@
       "samples": [
         {
           "name": "execution",
-          "confidence": 0.0
+          "unit": "ms"
         }
       ],
       "iterations": [
@@ -289,7 +289,7 @@
       "samples": [
         {
           "name": "execution",
-          "confidence": 0.9991642831782728
+          "unit": "ms"
         }
       ],
       "iterations": [