diff --git a/api/numerics/samples_stats_counter.h b/api/numerics/samples_stats_counter.h
index 9d72296317..c4eabffa2f 100644
--- a/api/numerics/samples_stats_counter.h
+++ b/api/numerics/samples_stats_counter.h
@@ -65,6 +65,12 @@ class SamplesStatsCounter {
     RTC_DCHECK(!IsEmpty());
     return *stats_.GetMax();
   }
+  // Returns sum in O(1) time. This function may not be called if there are
+  // no samples.
+  double GetSum() const {
+    RTC_DCHECK(!IsEmpty());
+    return *stats_.GetSum();
+  }
   // Returns average in O(1) time. This function may not be called if there are
   // no samples.
   double GetAverage() const {
diff --git a/api/numerics/samples_stats_counter_unittest.cc b/api/numerics/samples_stats_counter_unittest.cc
index 1f9cabfb29..d1614f2e2d 100644
--- a/api/numerics/samples_stats_counter_unittest.cc
+++ b/api/numerics/samples_stats_counter_unittest.cc
@@ -61,6 +61,7 @@ TEST(SamplesStatsCounterTest, FullSimpleTest) {
   EXPECT_TRUE(!stats.IsEmpty());
   EXPECT_DOUBLE_EQ(stats.GetMin(), 1.0);
   EXPECT_DOUBLE_EQ(stats.GetMax(), 100.0);
+  EXPECT_DOUBLE_EQ(stats.GetSum(), 5050.0);
   EXPECT_NEAR(stats.GetAverage(), 50.5, 1e-6);
   for (int i = 1; i <= 100; i++) {
     double p = i / 100.0;
diff --git a/rtc_base/numerics/running_statistics.h b/rtc_base/numerics/running_statistics.h
index bbcc7e2a73..fe991b043f 100644
--- a/rtc_base/numerics/running_statistics.h
+++ b/rtc_base/numerics/running_statistics.h
@@ -51,6 +51,7 @@ class RunningStatistics {
   void AddSample(T sample) {
     max_ = std::max(max_, sample);
     min_ = std::min(min_, sample);
+    sum_ += sample;
     ++size_;
     // Welford's incremental update.
     const double delta = sample - mean_;
@@ -123,6 +124,14 @@ class RunningStatistics {
     return max_;
   }
 
+  // Returns sum in O(1) time.
+  absl::optional<double> GetSum() const {
+    if (size_ == 0) {
+      return absl::nullopt;
+    }
+    return sum_;
+  }
+
   // Returns mean in O(1) time.
   absl::optional<double> GetMean() const {
     if (size_ == 0) {
@@ -153,6 +162,7 @@ class RunningStatistics {
   T max_ = minus_infinity_or_min<T>();
   double mean_ = 0;
   double cumul_ = 0;  // Variance * size_, sometimes noted m2.
+  double sum_ = 0;
 };
 
 }  // namespace webrtc_impl
diff --git a/rtc_base/numerics/running_statistics_unittest.cc b/rtc_base/numerics/running_statistics_unittest.cc
index d593f3fc5a..7f8adfba24 100644
--- a/rtc_base/numerics/running_statistics_unittest.cc
+++ b/rtc_base/numerics/running_statistics_unittest.cc
@@ -61,6 +61,7 @@ TEST(RunningStatistics, FullSimpleTest) {
 
   EXPECT_DOUBLE_EQ(*stats.GetMin(), 1.0);
   EXPECT_DOUBLE_EQ(*stats.GetMax(), 100.0);
+  EXPECT_DOUBLE_EQ(*stats.GetSum(), 5050.0);
   // EXPECT_DOUBLE_EQ is too strict (max 4 ULP) for this one.
   ASSERT_NEAR(*stats.GetMean(), 50.5, 1e-10);
 }