diff --git a/mempool/cat/pool.go b/mempool/cat/pool.go
index efe644f809..a1a86e1ef4 100644
--- a/mempool/cat/pool.go
+++ b/mempool/cat/pool.go
@@ -499,6 +499,7 @@ func (txmp *TxPool) Update(
 	// transactions are left.
 	size := txmp.Size()
 	txmp.metrics.Size.Set(float64(size))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 	if size > 0 {
 		if txmp.config.Recheck {
 			txmp.recheckTransactions()
@@ -576,6 +577,7 @@ func (txmp *TxPool) addNewTransaction(wtx *wrappedTx, checkTxRes *abci.ResponseC
 
 	txmp.metrics.TxSizeBytes.Observe(float64(wtx.size()))
 	txmp.metrics.Size.Set(float64(txmp.Size()))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 	txmp.logger.Debug(
 		"inserted new valid transaction",
 		"priority", wtx.priority,
@@ -628,6 +630,7 @@ func (txmp *TxPool) handleRecheckResult(wtx *wrappedTx, checkTxRes *abci.Respons
 	}
 	txmp.metrics.FailedTxs.Add(1)
 	txmp.metrics.Size.Set(float64(txmp.Size()))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 }
 
 // recheckTransactions initiates re-CheckTx ABCI calls for all the transactions
diff --git a/mempool/metrics.go b/mempool/metrics.go
index 6c00ce59bc..7c23a5f94b 100644
--- a/mempool/metrics.go
+++ b/mempool/metrics.go
@@ -30,6 +30,9 @@ type Metrics struct {
 	// Size of the mempool.
 	Size metrics.Gauge
 
+	// Total size of the mempool in bytes.
+	SizeBytes metrics.Gauge
+
 	// Histogram of transaction sizes, in bytes.
 	TxSizeBytes metrics.Histogram
 
@@ -81,6 +84,13 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 			Help:      "Size of the mempool (number of uncommitted transactions).",
 		}, labels).With(labelsAndValues...),
 
+		SizeBytes: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
+			Namespace: namespace,
+			Subsystem: MetricsSubsystem,
+			Name:      "size_bytes",
+			Help:      "Total size of the mempool in bytes.",
+		}, labels).With(labelsAndValues...),
+
 		TxSizeBytes: prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
 			Namespace: namespace,
 			Subsystem: MetricsSubsystem,
@@ -144,6 +154,7 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 func NopMetrics() *Metrics {
 	return &Metrics{
 		Size:           discard.NewGauge(),
+		SizeBytes:      discard.NewGauge(),
 		TxSizeBytes:    discard.NewHistogram(),
 		FailedTxs:      discard.NewCounter(),
 		EvictedTxs:     discard.NewCounter(),
diff --git a/mempool/v0/clist_mempool.go b/mempool/v0/clist_mempool.go
index 17dda10487..e81083cac8 100644
--- a/mempool/v0/clist_mempool.go
+++ b/mempool/v0/clist_mempool.go
@@ -277,6 +277,7 @@ func (mem *CListMempool) globalCb(req *abci.Request, res *abci.Response) {
 
 	// update metrics
 	mem.metrics.Size.Set(float64(mem.Size()))
+	mem.metrics.SizeBytes.Set(float64(mem.SizeBytes()))
 }
 
 // Request specific callback that should be set on individual reqRes objects
@@ -304,6 +305,7 @@ func (mem *CListMempool) reqResCb(
 
 		// update metrics
 		mem.metrics.Size.Set(float64(mem.Size()))
+		mem.metrics.SizeBytes.Set(float64(mem.SizeBytes()))
 
 		// passed in by the caller of CheckTx, eg. the RPC
 		if externalCb != nil {
@@ -639,6 +641,7 @@ func (mem *CListMempool) Update(
 
 	// Update metrics
 	mem.metrics.Size.Set(float64(mem.Size()))
+	mem.metrics.SizeBytes.Set(float64(mem.SizeBytes()))
 
 	return nil
 }
diff --git a/mempool/v1/mempool.go b/mempool/v1/mempool.go
index d3736ef74f..c7191fad9c 100644
--- a/mempool/v1/mempool.go
+++ b/mempool/v1/mempool.go
@@ -439,6 +439,7 @@ func (txmp *TxMempool) Update(
 	// transactions are left.
 	size := txmp.Size()
 	txmp.metrics.Size.Set(float64(size))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 	if size > 0 {
 		if txmp.config.Recheck {
 			txmp.recheckTransactions()
@@ -608,6 +609,7 @@ func (txmp *TxMempool) addNewTransaction(wtx *WrappedTx, checkTxRes *abci.Respon
 
 	txmp.metrics.TxSizeBytes.Observe(float64(wtx.Size()))
 	txmp.metrics.Size.Set(float64(txmp.Size()))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 	txmp.logger.Debug(
 		"inserted new valid transaction",
 		"priority", wtx.Priority(),
@@ -675,6 +677,7 @@ func (txmp *TxMempool) handleRecheckResult(tx types.Tx, checkTxRes *abci.Respons
 		}
 	}
 	txmp.metrics.Size.Set(float64(txmp.Size()))
+	txmp.metrics.SizeBytes.Set(float64(txmp.SizeBytes()))
 }
 
 // recheckTransactions initiates re-CheckTx ABCI calls for all the transactions