diff --git a/libc/test/src/math/log10f_test.cpp b/libc/test/src/math/log10f_test.cpp
@@ -0,0 +1,74 @@
+//===-- Unittests for log10f ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/math/log10f.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+#include "utils/UnitTest/FPMatcher.h"
+#include "utils/UnitTest/Test.h"
+#include <math.h>
+
+#include <errno.h>
+#include <stdint.h>
+
+namespace mpfr = __llvm_libc::testing::mpfr;
+
+DECLARE_SPECIAL_CONSTANTS(float)
+
+TEST(LlvmLibcLog10fTest, SpecialNumbers) {
+  EXPECT_FP_EQ(aNaN, __llvm_libc::log10f(aNaN));
+  EXPECT_FP_EQ(inf, __llvm_libc::log10f(inf));
+  EXPECT_TRUE(FPBits(__llvm_libc::log10f(neg_inf)).is_nan());
+  EXPECT_FP_EQ(neg_inf, __llvm_libc::log10f(0.0f));
+  EXPECT_FP_EQ(neg_inf, __llvm_libc::log10f(-0.0f));
+  EXPECT_TRUE(FPBits(__llvm_libc::log10f(-1.0f)).is_nan());
+  EXPECT_FP_EQ(zero, __llvm_libc::log10f(1.0f));
+}
+
+TEST(LlvmLibcLog10fTest, TrickyInputs) {
+  constexpr int N = 12;
+  constexpr uint32_t INPUTS[N] = {
+      0x41200000U /*10.0f*/,
+      0x42c80000U /*100.0f*/,
+      0x447a0000U /*1,000.0f*/,
+      0x461c4000U /*10,000.0f*/,
+      0x47c35000U /*100,000.0f*/,
+      0x49742400U /*1,000,000.0f*/,
+      0x4b189680U /*10,000,000.0f*/,
+      0x4cbebc20U /*100,000,000.0f*/,
+      0x4e6e6b28U /*1,000,000,000.0f*/,
+      0x501502f9U /*10,000,000,000.0f*/,
+      0x4f134f83U /*2471461632.0f*/,
+      0x7956ba5eU /*69683218960000541503257137270226944.0f*/};
+
+  for (int i = 0; i < N; ++i) {
+    float x = float(FPBits(INPUTS[i]));
+    EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10, x,
+                                   __llvm_libc::log10f(x), 0.5);
+  }
+}
+
+TEST(LlvmLibcLog10fTest, InFloatRange) {
+  constexpr uint32_t COUNT = 1000000;
+  constexpr uint32_t STEP = UINT32_MAX / COUNT;
+  for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
+    float x = float(FPBits(v));
+    if (isnan(x) || isinf(x))
+      continue;
+    errno = 0;
+    float result = __llvm_libc::log10f(x);
+    // If the computation resulted in an error or did not produce valid result
+    // in the single-precision floating point range, then ignore comparing with
+    // MPFR result as MPFR can still produce valid results because of its
+    // wider precision.
+    if (isnan(result) || isinf(result) || errno != 0)
+      continue;
+    ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10, x,
+                                   __llvm_libc::log10f(x), 0.5);
+  }
+}
diff --git a/libc/utils/MPFRWrapper/MPFRUtils.cpp b/libc/utils/MPFRWrapper/MPFRUtils.cpp
@@ -273,6 +273,12 @@ class MPFRNumber {
     return result;
   }
 
+  MPFRNumber log10() const {
+    MPFRNumber result(*this);
+    mpfr_log10(result.value, value, mpfr_rounding);
+    return result;
+  }
+
   MPFRNumber remquo(const MPFRNumber &divisor, int &quotient) {
     MPFRNumber remainder(*this);
     long q;
@@ -502,6 +508,8 @@ unary_operation(Operation op, InputType input, unsigned int precision,
     return mpfrInput.log();
   case Operation::Log2:
     return mpfrInput.log2();
+  case Operation::Log10:
+    return mpfrInput.log10();
   case Operation::Mod2PI:
     return mpfrInput.mod_2pi();
   case Operation::ModPIOver2:

diff --git a/libc/utils/MPFRWrapper/MPFRUtils.h b/libc/utils/MPFRWrapper/MPFRUtils.h
@@ -32,6 +32,7 @@ enum class Operation : int {
   Floor,
   Log,
   Log2,
+  Log10,
   Mod2PI,
   ModPIOver2,
   ModPIOver4,
-Original file line number
+Diff line change
@@ Expand Up / @@ -32,6 +32,7 @@ enum class Operation : int { @@
       Floor,
       Log,
       Log2,
+      Log10,
       Mod2PI,
       ModPIOver2,
       ModPIOver4,
@@ Expand Down @@