diff --git a/internal/mempool/mempool.go b/internal/mempool/mempool.go
index b49f3ace5..1f069b1c9 100644
--- a/internal/mempool/mempool.go
+++ b/internal/mempool/mempool.go
@@ -180,13 +180,27 @@ func (txmp *TxMempool) Unlock() {
 // Size returns the number of valid transactions in the mempool. It is
 // thread-safe.
 func (txmp *TxMempool) Size() int {
-	return txmp.SizeWithoutPending() + txmp.PendingSize()
+	return txmp.NumTxsNotPending() + txmp.PendingSize()
 }
 
-func (txmp *TxMempool) SizeWithoutPending() int {
+func (txmp *TxMempool) NumTxsNotPending() int {
 	return txmp.txStore.Size()
 }
 
+func (txmp *TxMempool) BytesNotPending() int64 {
+	txmp.txStore.mtx.RLock()
+	defer txmp.txStore.mtx.RUnlock()
+	totalBytes := int64(0)
+	for _, wrappedTx := range txmp.txStore.hashTxs {
+		totalBytes += int64(len(wrappedTx.tx))
+	}
+	return totalBytes
+}
+
+func (txmp *TxMempool) TotalTxsBytesSize() int64 {
+	return txmp.BytesNotPending() + int64(txmp.pendingTxs.sizeBytes)
+}
+
 // PendingSize returns the number of pending transactions in the mempool.
 func (txmp *TxMempool) PendingSize() int {
 	return txmp.pendingTxs.Size()
@@ -427,7 +441,7 @@ func (txmp *TxMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs {
 	)
 
 	var txs []types.Tx
-	if uint64(txmp.SizeWithoutPending()) < txmp.config.TxNotifyThreshold {
+	if uint64(txmp.NumTxsNotPending()) < txmp.config.TxNotifyThreshold {
 		// do not reap anything if threshold is not met
 		return txs
 	}
@@ -549,7 +563,8 @@ func (txmp *TxMempool) Update(
 		}
 	}
 
-	txmp.metrics.Size.Set(float64(txmp.SizeWithoutPending()))
+	txmp.metrics.Size.Set(float64(txmp.NumTxsNotPending()))
+	txmp.metrics.TotalTxsSizeBytes.Set(float64(txmp.TotalTxsBytesSize()))
 	txmp.metrics.PendingSize.Set(float64(txmp.PendingSize()))
 	return nil
 }
@@ -676,7 +691,7 @@ func (txmp *TxMempool) addNewTransaction(wtx *WrappedTx, res *abci.ResponseCheck
 			"priority", wtx.priority,
 			"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
 			"height", txmp.height,
-			"num_txs", txmp.SizeWithoutPending(),
+			"num_txs", txmp.NumTxsNotPending(),
 		)
 		txmp.notifyTxsAvailable()
 	}
@@ -772,13 +787,14 @@ func (txmp *TxMempool) handleRecheckResult(tx types.Tx, res *abci.ResponseCheckT
 	if txmp.recheckCursor == nil {
 		txmp.logger.Debug("finished rechecking transactions")
 
-		if txmp.SizeWithoutPending() > 0 {
+		if txmp.NumTxsNotPending() > 0 {
 			txmp.notifyTxsAvailable()
 		}
 	}
 
-	txmp.metrics.Size.Set(float64(txmp.SizeWithoutPending()))
+	txmp.metrics.Size.Set(float64(txmp.NumTxsNotPending()))
 	txmp.metrics.PendingSize.Set(float64(txmp.PendingSize()))
+	txmp.metrics.TotalTxsSizeBytes.Set(float64(txmp.TotalTxsBytesSize()))
 }
 
 // updateReCheckTxs updates the recheck cursors using the gossipIndex. For
@@ -830,7 +846,7 @@ func (txmp *TxMempool) updateReCheckTxs(ctx context.Context) {
 // the transaction can be inserted into the mempool.
 func (txmp *TxMempool) canAddTx(wtx *WrappedTx) error {
 	var (
-		numTxs    = txmp.SizeWithoutPending()
+		numTxs    = txmp.NumTxsNotPending()
 		sizeBytes = txmp.SizeBytes()
 	)
 
@@ -869,9 +885,10 @@ func (txmp *TxMempool) insertTx(wtx *WrappedTx) bool {
 	if !inserted {
 		return false
 	}
-	txmp.metrics.TxSizeBytes.Observe(float64(wtx.Size()))
-	txmp.metrics.Size.Set(float64(txmp.SizeWithoutPending()))
+	txmp.metrics.TxSizeBytes.Add(float64(wtx.Size()))
+	txmp.metrics.Size.Set(float64(txmp.NumTxsNotPending()))
 	txmp.metrics.PendingSize.Set(float64(txmp.PendingSize()))
+	txmp.metrics.TotalTxsSizeBytes.Set(float64(txmp.TotalTxsBytesSize()))
 
 	if replacedTx != nil {
 		txmp.removeTx(replacedTx, true, false, false)
@@ -1013,7 +1030,7 @@ func (txmp *TxMempool) purgeExpiredTxs(blockHeight int64) {
 }
 
 func (txmp *TxMempool) notifyTxsAvailable() {
-	if txmp.SizeWithoutPending() == 0 {
+	if txmp.NumTxsNotPending() == 0 {
 		return
 	}
 
diff --git a/internal/mempool/metrics.gen.go b/internal/mempool/metrics.gen.go
index cfff9ad4c..c9dea0810 100644
--- a/internal/mempool/metrics.gen.go
+++ b/internal/mempool/metrics.gen.go
@@ -26,13 +26,17 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 			Name:      "pending_size",
 			Help:      "Number of pending transactions in mempool",
 		}, labels).With(labelsAndValues...),
-		TxSizeBytes: prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
+		TxSizeBytes: prometheus.NewCounterFrom(stdprometheus.CounterOpts{
 			Namespace: namespace,
 			Subsystem: MetricsSubsystem,
 			Name:      "tx_size_bytes",
-			Help:      "Histogram of transaction sizes in bytes.",
-
-			Buckets: stdprometheus.ExponentialBuckets(1, 3, 7),
+			Help:      "Accumulated transaction sizes in bytes.",
+		}, labels).With(labelsAndValues...),
+		TotalTxsSizeBytes: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
+			Namespace: namespace,
+			Subsystem: MetricsSubsystem,
+			Name:      "total_txs_size_bytes",
+			Help:      "Total current mempool uncommitted txs bytes",
 		}, labels).With(labelsAndValues...),
 		FailedTxs: prometheus.NewCounterFrom(stdprometheus.CounterOpts{
 			Namespace: namespace,
@@ -81,15 +85,16 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 
 func NopMetrics() *Metrics {
 	return &Metrics{
-		Size:         discard.NewGauge(),
-		PendingSize:  discard.NewGauge(),
-		TxSizeBytes:  discard.NewHistogram(),
-		FailedTxs:    discard.NewCounter(),
-		RejectedTxs:  discard.NewCounter(),
-		EvictedTxs:   discard.NewCounter(),
-		ExpiredTxs:   discard.NewCounter(),
-		RecheckTimes: discard.NewCounter(),
-		RemovedTxs:   discard.NewCounter(),
-		InsertedTxs:  discard.NewCounter(),
+		Size:              discard.NewGauge(),
+		PendingSize:       discard.NewGauge(),
+		TxSizeBytes:       discard.NewCounter(),
+		TotalTxsSizeBytes: discard.NewGauge(),
+		FailedTxs:         discard.NewCounter(),
+		RejectedTxs:       discard.NewCounter(),
+		EvictedTxs:        discard.NewCounter(),
+		ExpiredTxs:        discard.NewCounter(),
+		RecheckTimes:      discard.NewCounter(),
+		RemovedTxs:        discard.NewCounter(),
+		InsertedTxs:       discard.NewCounter(),
 	}
 }
diff --git a/internal/mempool/metrics.go b/internal/mempool/metrics.go
index fb68f7918..84cb95f5d 100644
--- a/internal/mempool/metrics.go
+++ b/internal/mempool/metrics.go
@@ -21,8 +21,11 @@ type Metrics struct {
 	// Number of pending transactions in mempool
 	PendingSize metrics.Gauge
 
-	// Histogram of transaction sizes in bytes.
-	TxSizeBytes metrics.Histogram `metrics_buckettype:"exp" metrics_bucketsizes:"1,3,7"`
+	// Accumulated transaction sizes in bytes.
+	TxSizeBytes metrics.Counter
+
+	// Total current mempool uncommitted txs bytes
+	TotalTxsSizeBytes metrics.Gauge
 
 	// Number of failed transactions.
 	FailedTxs metrics.Counter