diff --git a/docs/VictoriaLogs/LogsQL.md b/docs/VictoriaLogs/LogsQL.md
index c0ccb5c6c..1b002d357 100644
--- a/docs/VictoriaLogs/LogsQL.md
+++ b/docs/VictoriaLogs/LogsQL.md
@@ -1072,30 +1072,39 @@ See the [Roadmap](https://docs.victoriametrics.com/VictoriaLogs/Roadmap.html) fo
 LogsQL supports calculating the following stats:
 
 - The number of matching log entries. Examples:
-  - `error | stats count() as errors_total` returns the number of log messages containing the `error` [word](#word).
-  - `error | stats by (_stream) count() as errors_by_stream` returns the number of log messages containing the `error` [word](#word)
-  grouped by [`_stream`](https://docs.victoriametrics.com/victorialogs/keyconcepts/#stream-fields).
-  - `error | stats by (datacenter, namespace) count(trace_id, user_id) as errors_with_trace_and_user` returns the number of log messages containing the `error` [word](#word),
+  - `error | stats count() as errors_total` returns the number of [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field) with the `error` [word](#word).
+  - `error | stats by (_stream) count() as errors_by_stream` returns the number of [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field)
+  with the `error` [word](#word) grouped by [`_stream`](https://docs.victoriametrics.com/victorialogs/keyconcepts/#stream-fields).
+  - `error | stats by (datacenter, namespace) count(trace_id, user_id) as errors_with_trace_and_user` returns the number
+  of [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field)  containing the `error` [word](#word),
   which contain non-empty `trace_id` or `user_id` [fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model), grouped by `datacenter` and `namespace` fields.
 
 - The number of unique values for the given set of [fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model). Examples:
   - `error | stats uniq(client_ip) as unique_user_ips` returns the number of unique values for `client_ip` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model)
-  across log messages with the `error` [word](#word).
+  across [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field) with the `error` [word](#word).
   - `error | stats by (app) uniq(path, host) as unique_path_hosts` - returns the number of unique `(path, host)` pairs
-  for [field values](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) across log messages with the `error` [word](#word),
-  grouped by `app` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
-  - `error | fields path, host | stats uniq(*)` - returns the number of unique `(path, host)` pairs
-  for [field values](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) across log messages with the `error` [word](#word).
+  for [field values](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) across [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field)
+  with the `error` [word](#word), grouped by `app` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model).
+  - `error | fields path, host | stats uniq(*) unique_path_hosts` - returns the number of unique `(path, host)` pairs
+  for [field values](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) across [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field)
+  with the `error` [word](#word).
 
-Stats' calculation can be combined in a single query. For example, the following query calculates the number of log messages with the `error` [word](#word),
-the number of unique values for `ip` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) and the number of unique values
-for `path` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model), grouped by `namespace` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model):
+- Sum for the given [fields](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model). Examples:
+  - `error | stats sum(duration) duration_total` - returns the sum of `duration` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) values
+  across [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field) with the `error` [word](#word).
+  - `GET | stats by (path) sum(response_size)` - returns the sum of `response_size` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) values
+  across [log messages](https://docs.victoriametrics.com/victorialogs/keyconcepts/#message-field) with the `GET` [word](#word), grouped
+  by `path` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) value.
+
+Stats calculations can be combined. For example, the following query calculates the number of log messages with the `error` [word](#word),
+the number of unique values for `ip` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) and the sum of `duration`
+[field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model), grouped by `namespace` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model):
 
 ```logsql
 error | stats by (namespace)
   count() as errors_total,
   uniq(ip) as unique_ips,
-  uniq(path) as unique_paths
+  sum(duration) as duration_sum
 ```
 
 LogsQL will support calculating the following additional stats based on the [log fields](https://docs.victoriametrics.com/VictoriaLogs/keyConcepts.html#data-model)
diff --git a/lib/logstorage/parser_test.go b/lib/logstorage/parser_test.go
index 9fbb9ac5e..7223087bf 100644
--- a/lib/logstorage/parser_test.go
+++ b/lib/logstorage/parser_test.go
@@ -838,6 +838,10 @@ func TestParseQuerySuccess(t *testing.T) {
 	f(`* | STATS bY (foo, b.a/r, "b az") count(*) XYz`, `* | stats by (foo, "b.a/r", "b az") count(*) as XYz`)
 	f(`* | stats by() COUNT(x, 'a).b,c|d') as qwert`, `* | stats count(x, "a).b,c|d") as qwert`)
 
+	// stats pipe sum
+	f(`* | stats Sum(foo) bar`, `* | stats sum(foo) as bar`)
+	f(`* | stats BY(x, y, ) SUM(foo,bar,) bar`, `* | stats by (x, y) sum(foo, bar) as bar`)
+
 	// stats pipe uniq
 	f(`* | stats uniq(foo) bar`, `* | stats uniq(foo) as bar`)
 	f(`* | stats by(x, y) uniq(foo,bar) as baz`, `* | stats by (x, y) uniq(foo, bar) as baz`)
@@ -1090,9 +1094,15 @@ func TestParseQueryFailure(t *testing.T) {
 	f(`foo | stats count() as`)
 	f(`foo | stats count() as |`)
 
+	// invalid stats sum
+	f(`foo | stats sum`)
+	f(`foo | stats sum()`)
+	f(`foo | stats sum() as abc`)
+
 	// invalid stats uniq
 	f(`foo | stats uniq`)
 	f(`foo | stats uniq()`)
+	f(`foo | stats uniq() as abc`)
 
 	// invalid by clause
 	f(`foo | stats by`)
diff --git a/lib/logstorage/pipes.go b/lib/logstorage/pipes.go
index c8e97af43..74ecd56be 100644
--- a/lib/logstorage/pipes.go
+++ b/lib/logstorage/pipes.go
@@ -2,6 +2,7 @@ package logstorage
 
 import (
 	"fmt"
+	"math"
 	"slices"
 	"strconv"
 	"strings"
@@ -603,6 +604,12 @@ func parseStatsFunc(lex *lexer) (statsFunc, error) {
 			return nil, fmt.Errorf("cannot parse 'uniq' func: %w", err)
 		}
 		return sfu, nil
+	case lex.isKeyword("sum"):
+		sfs, err := parseStatsFuncSum(lex)
+		if err != nil {
+			return nil, fmt.Errorf("cannot parse 'sum' func: %w", err)
+		}
+		return sfs, nil
 	default:
 		return nil, fmt.Errorf("unknown stats func %q", lex.token)
 	}
@@ -696,6 +703,142 @@ func (sfcp *statsFuncCountProcessor) finalizeStats() (string, string) {
 	return sfcp.sfc.resultName, value
 }
 
+func parseStatsFuncCount(lex *lexer) (*statsFuncCount, error) {
+	lex.nextToken()
+	fields, err := parseFieldNamesInParens(lex)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse 'count' args: %w", err)
+	}
+	resultName, err := parseResultName(lex)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse result name: %w", err)
+	}
+	sfc := &statsFuncCount{
+		fields:       fields,
+		containsStar: slices.Contains(fields, "*"),
+		resultName:   resultName,
+	}
+	return sfc, nil
+}
+
+type statsFuncSum struct {
+	fields       []string
+	containsStar bool
+	resultName   string
+}
+
+func (sfs *statsFuncSum) String() string {
+	return "sum(" + fieldNamesString(sfs.fields) + ") as " + quoteTokenIfNeeded(sfs.resultName)
+}
+
+func (sfs *statsFuncSum) neededFields() []string {
+	return sfs.fields
+}
+
+func (sfs *statsFuncSum) newStatsFuncProcessor() (statsFuncProcessor, int) {
+	sfsp := &statsFuncSumProcessor{
+		sfs: sfs,
+	}
+	return sfsp, int(unsafe.Sizeof(*sfsp))
+}
+
+type statsFuncSumProcessor struct {
+	sfs *statsFuncSum
+
+	sum float64
+}
+
+func (sfsp *statsFuncSumProcessor) updateStatsForAllRows(timestamps []int64, columns []BlockColumn) int {
+	if sfsp.sfs.containsStar {
+		// Sum all the columns
+		for _, c := range columns {
+			sfsp.sum += sumValues(c.Values)
+		}
+		return 0
+	}
+
+	// Sum the requested columns
+	for _, field := range sfsp.sfs.fields {
+		if idx := getBlockColumnIndex(columns, field); idx >= 0 {
+			sfsp.sum += sumValues(columns[idx].Values)
+		}
+	}
+	return 0
+}
+
+func sumValues(values []string) float64 {
+	sum := float64(0)
+	f := float64(0)
+	for i, v := range values {
+		if i == 0 || values[i-1] != v {
+			f, _ = tryParseFloat64(v)
+			if math.IsNaN(f) {
+				// Ignore NaN values, since this is the expected behaviour by most users.
+				f = 0
+			}
+		}
+		sum += f
+	}
+	return sum
+}
+
+func (sfsp *statsFuncSumProcessor) updateStatsForRow(_ []int64, columns []BlockColumn, rowIdx int) int {
+	if sfsp.sfs.containsStar {
+		// Sum all the fields for the given row
+		for _, c := range columns {
+			v := c.Values[rowIdx]
+			f, _ := tryParseFloat64(v)
+			if !math.IsNaN(f) {
+				sfsp.sum += f
+			}
+		}
+		return 0
+	}
+
+	// Sum only the given fields for the given row
+	for _, field := range sfsp.sfs.fields {
+		if idx := getBlockColumnIndex(columns, field); idx >= 0 {
+			v := columns[idx].Values[rowIdx]
+			f, _ := tryParseFloat64(v)
+			if !math.IsNaN(f) {
+				sfsp.sum += f
+			}
+		}
+	}
+	return 0
+}
+
+func (sfsp *statsFuncSumProcessor) mergeState(sfp statsFuncProcessor) {
+	src := sfp.(*statsFuncSumProcessor)
+	sfsp.sum += src.sum
+}
+
+func (sfsp *statsFuncSumProcessor) finalizeStats() (string, string) {
+	value := strconv.FormatFloat(sfsp.sum, 'g', -1, 64)
+	return sfsp.sfs.resultName, value
+}
+
+func parseStatsFuncSum(lex *lexer) (*statsFuncSum, error) {
+	lex.nextToken()
+	fields, err := parseFieldNamesInParens(lex)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse 'sum' args: %w", err)
+	}
+	if len(fields) == 0 {
+		return nil, fmt.Errorf("'sum' must contain at least one arg")
+	}
+	resultName, err := parseResultName(lex)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse result name: %w", err)
+	}
+	sfs := &statsFuncSum{
+		fields:       fields,
+		containsStar: slices.Contains(fields, "*"),
+		resultName:   resultName,
+	}
+	return sfs, nil
+}
+
 type statsFuncUniq struct {
 	fields       []string
 	containsStar bool
@@ -942,24 +1085,6 @@ func parseStatsFuncUniq(lex *lexer) (*statsFuncUniq, error) {
 	return sfu, nil
 }
 
-func parseStatsFuncCount(lex *lexer) (*statsFuncCount, error) {
-	lex.nextToken()
-	fields, err := parseFieldNamesInParens(lex)
-	if err != nil {
-		return nil, fmt.Errorf("cannot parse 'count' args: %w", err)
-	}
-	resultName, err := parseResultName(lex)
-	if err != nil {
-		return nil, fmt.Errorf("cannot parse result name: %w", err)
-	}
-	sfc := &statsFuncCount{
-		fields:       fields,
-		containsStar: slices.Contains(fields, "*"),
-		resultName:   resultName,
-	}
-	return sfc, nil
-}
-
 func parseResultName(lex *lexer) (string, error) {
 	if lex.isKeyword("as") {
 		if !lex.mustNextToken() {