diff --git a/docs/VictoriaLogs/LogsQL.md b/docs/VictoriaLogs/LogsQL.md
index 44291699c..a9af1e1d8 100644
--- a/docs/VictoriaLogs/LogsQL.md
+++ b/docs/VictoriaLogs/LogsQL.md
@@ -1373,6 +1373,7 @@ LogsQL supports the following functions for [`stats` pipe](#stats-pipe):
 - [`max`](#max-stats) calcualtes the maximum value over the given numeric [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
 - [`min`](#min-stats) calculates the minumum value over the given numeric [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
 - [`sum`](#sum-stats) calculates the sum for the given numeric [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
+- [`sum_len`](#sum_len-stats) calculates the sum of lengths for the given [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
 - [`uniq_values`](#uniq_values-stats) returns unique non-empty values for the given [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
 - [`values`](#values-stats) returns all the values for the given [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
 
@@ -1535,6 +1536,22 @@ See also:
 - [`max`](#max-stats)
 - [`min`](#min-stats)
 
+### sum_len stats
+
+`sum_len(field1, ..., fieldN)` [stats pipe](#stats-pipe) calculates the sum of lengths of all the values
+for the given [log fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
+
+For example, the following query returns the sum of lengths of [`_msg` fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field)
+across all the logs for the last 5 minutes:
+
+```logsql
+_time:5m | stats sum_len(_msg) messages_len
+```
+
+See also:
+
+- [`count`](#count-stats)
+
 ### uniq_values stats
 
 `uniq_values(field1, ..., fieldN)` [stats pipe](#stats-pipe) returns the unique non-empty values across
diff --git a/lib/logstorage/block_result.go b/lib/logstorage/block_result.go
index a873a1c0f..d257775f0 100644
--- a/lib/logstorage/block_result.go
+++ b/lib/logstorage/block_result.go
@@ -1738,6 +1738,55 @@ func (c *blockResultColumn) getMinValue() float64 {
 	}
 }
 
+func (c *blockResultColumn) sumLenValues(br *blockResult) uint64 {
+	if c.isConst {
+		v := c.encodedValues[0]
+		return uint64(len(v)) * uint64(len(br.timestamps))
+	}
+	if c.isTime {
+		return uint64(len(time.RFC3339Nano)) * uint64(len(br.timestamps))
+	}
+
+	switch c.valueType {
+	case valueTypeString:
+		return c.sumLenStringValues(br)
+	case valueTypeDict:
+		n := uint64(0)
+		dictValues := c.dictValues
+		for _, v := range c.encodedValues {
+			idx := v[0]
+			v := dictValues[idx]
+			n += uint64(len(v))
+		}
+		return n
+	case valueTypeUint8:
+		return c.sumLenStringValues(br)
+	case valueTypeUint16:
+		return c.sumLenStringValues(br)
+	case valueTypeUint32:
+		return c.sumLenStringValues(br)
+	case valueTypeUint64:
+		return c.sumLenStringValues(br)
+	case valueTypeFloat64:
+		return c.sumLenStringValues(br)
+	case valueTypeIPv4:
+		return c.sumLenStringValues(br)
+	case valueTypeTimestampISO8601:
+		return uint64(len(iso8601Timestamp)) * uint64(len(br.timestamps))
+	default:
+		logger.Panicf("BUG: unknown valueType=%d", c.valueType)
+		return 0
+	}
+}
+
+func (c *blockResultColumn) sumLenStringValues(br *blockResult) uint64 {
+	n := uint64(0)
+	for _, v := range c.getValues(br) {
+		n += uint64(len(v))
+	}
+	return n
+}
+
 func (c *blockResultColumn) sumValues(br *blockResult) (float64, int) {
 	if c.isConst {
 		v := c.encodedValues[0]
diff --git a/lib/logstorage/parser_test.go b/lib/logstorage/parser_test.go
index ee9498a0b..fe4dbd9c2 100644
--- a/lib/logstorage/parser_test.go
+++ b/lib/logstorage/parser_test.go
@@ -926,6 +926,13 @@ func TestParseQuerySuccess(t *testing.T) {
 	f(`* | stats by(x) values() limit 1_000 AS y`, `* | stats by (x) values(*) limit 1000 as y`)
 	f(`* | stats by(x) values(a,*,b) y`, `* | stats by (x) values(*) as y`)
 
+	// stats pipe sum_len
+	f(`* | stats Sum_len(foo) bar`, `* | stats sum_len(foo) as bar`)
+	f(`* | stats BY(x, y, ) SUM_Len(foo,bar,) bar`, `* | stats by (x, y) sum_len(foo, bar) as bar`)
+	f(`* | stats sum_len() x`, `* | stats sum_len(*) as x`)
+	f(`* | stats sum_len(*) x`, `* | stats sum_len(*) as x`)
+	f(`* | stats sum_len(foo,*,bar) x`, `* | stats sum_len(*) as x`)
+
 	// stats pipe multiple funcs
 	f(`* | stats count() "foo.bar:baz", count_uniq(a) bar`, `* | stats count(*) as "foo.bar:baz", count_uniq(a) as bar`)
 	f(`* | stats by (x, y) count(*) foo, count_uniq(a,b) bar`, `* | stats by (x, y) count(*) as foo, count_uniq(a, b) as bar`)
@@ -1275,6 +1282,10 @@ func TestParseQueryFailure(t *testing.T) {
 	f(`foo | stats values(a) limit 0.5`)
 	f(`foo | stats values(a) limit -1`)
 
+	// invalid stats sum_len
+	f(`foo | stats sum_len`)
+	f(`foo | stats sum_len()`)
+
 	// invalid stats grouping fields
 	f(`foo | stats by(foo:bar) count() baz`)
 	f(`foo | stats by(foo:/bar) count() baz`)
diff --git a/lib/logstorage/pipe_stats.go b/lib/logstorage/pipe_stats.go
index 3a9d8980b..fcdd43a5a 100644
--- a/lib/logstorage/pipe_stats.go
+++ b/lib/logstorage/pipe_stats.go
@@ -534,6 +534,12 @@ func parseStatsFunc(lex *lexer) (statsFunc, string, error) {
 			return nil, "", fmt.Errorf("cannot parse 'values' func: %w", err)
 		}
 		sf = svs
+	case lex.isKeyword("sum_len"):
+		sss, err := parseStatsSumLen(lex)
+		if err != nil {
+			return nil, "", fmt.Errorf("cannot parse 'sum_len' func: %w", err)
+		}
+		sf = sss
 	default:
 		return nil, "", fmt.Errorf("unknown stats func %q", lex.token)
 	}
diff --git a/lib/logstorage/stats_sum_len.go b/lib/logstorage/stats_sum_len.go
new file mode 100644
index 000000000..f09e48418
--- /dev/null
+++ b/lib/logstorage/stats_sum_len.go
@@ -0,0 +1,89 @@
+package logstorage
+
+import (
+	"slices"
+	"strconv"
+	"unsafe"
+)
+
+type statsSumLen struct {
+	fields       []string
+	containsStar bool
+}
+
+func (ss *statsSumLen) String() string {
+	return "sum_len(" + fieldNamesString(ss.fields) + ")"
+}
+
+func (ss *statsSumLen) neededFields() []string {
+	return ss.fields
+}
+
+func (ss *statsSumLen) newStatsProcessor() (statsProcessor, int) {
+	ssp := &statsSumLenProcessor{
+		ss:     ss,
+		sumLen: 0,
+	}
+	return ssp, int(unsafe.Sizeof(*ssp))
+}
+
+type statsSumLenProcessor struct {
+	ss *statsSumLen
+
+	sumLen uint64
+}
+
+func (ssp *statsSumLenProcessor) updateStatsForAllRows(br *blockResult) int {
+	if ssp.ss.containsStar {
+		// Sum all the columns
+		for _, c := range br.getColumns() {
+			ssp.sumLen += c.sumLenValues(br)
+		}
+	} else {
+		// Sum the requested columns
+		for _, field := range ssp.ss.fields {
+			c := br.getColumnByName(field)
+			ssp.sumLen += c.sumLenValues(br)
+		}
+	}
+	return 0
+}
+
+func (ssp *statsSumLenProcessor) updateStatsForRow(br *blockResult, rowIdx int) int {
+	if ssp.ss.containsStar {
+		// Sum all the fields for the given row
+		for _, c := range br.getColumns() {
+			v := c.getValueAtRow(br, rowIdx)
+			ssp.sumLen += uint64(len(v))
+		}
+	} else {
+		// Sum only the given fields for the given row
+		for _, field := range ssp.ss.fields {
+			c := br.getColumnByName(field)
+			v := c.getValueAtRow(br, rowIdx)
+			ssp.sumLen += uint64(len(v))
+		}
+	}
+	return 0
+}
+
+func (ssp *statsSumLenProcessor) mergeState(sfp statsProcessor) {
+	src := sfp.(*statsSumLenProcessor)
+	ssp.sumLen += src.sumLen
+}
+
+func (ssp *statsSumLenProcessor) finalizeStats() string {
+	return strconv.FormatUint(ssp.sumLen, 10)
+}
+
+func parseStatsSumLen(lex *lexer) (*statsSumLen, error) {
+	fields, err := parseFieldNamesForStatsFunc(lex, "sum_len")
+	if err != nil {
+		return nil, err
+	}
+	ss := &statsSumLen{
+		fields:       fields,
+		containsStar: slices.Contains(fields, "*"),
+	}
+	return ss, nil
+}