diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index d8b5a1e87f9..e4ce6725700 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -559,7 +559,7 @@ static size_t value_accuracy_to_buf_fast(char *buf, float value, int8_t accuracy
   p = uint32_to_str_unchecked(p, scaled / mult);
   if (accuracy_decimals > 0) {
     *p++ = '.';
-    p = frac_to_str_(p, scaled % mult, mult / 10);
+    p = frac_to_str_unchecked(p, scaled % mult, mult / 10);
   }
   *p = '\0';
   return static_cast<size_t>(p - buf);
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index d41b8181a45..55f411fdec4 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -1331,7 +1331,7 @@ inline size_t uint32_to_str(std::span<char, UINT32_MAX_STR_SIZE> buf, uint32_t v
 /// Write fractional digits with leading zeros to buffer (internal, no size check).
 /// frac is the fractional value, divisor is the highest place value (e.g. 100 for 3 digits).
 /// Returns pointer past last char written.
-inline char *frac_to_str_(char *buf, uint32_t frac, uint32_t divisor) {
+inline char *frac_to_str_unchecked(char *buf, uint32_t frac, uint32_t divisor) {
   while (divisor > 0) {
     *buf++ = '0' + static_cast<char>(frac / divisor);
     frac %= divisor;
diff --git a/tests/components/core/test_helpers.cpp b/tests/components/core/test_helpers.cpp
index 68568982e44..5fb77ef7536 100644
--- a/tests/components/core/test_helpers.cpp
+++ b/tests/components/core/test_helpers.cpp
@@ -124,11 +124,11 @@ TEST(SmallPow10, One) { EXPECT_EQ(small_pow10(1), 10u); }
 TEST(SmallPow10, Two) { EXPECT_EQ(small_pow10(2), 100u); }
 TEST(SmallPow10, Three) { EXPECT_EQ(small_pow10(3), 1000u); }
 
-// --- frac_to_str_() ---
+// --- frac_to_str_unchecked() ---
 
 TEST(FracToStr, OneDigit) {
   char buf[8];
-  char *end = frac_to_str_(buf, 5, 1);
+  char *end = frac_to_str_unchecked(buf, 5, 1);
   *end = '\0';
   EXPECT_STREQ(buf, "5");
   EXPECT_EQ(end - buf, 1);
@@ -136,14 +136,14 @@ TEST(FracToStr, OneDigit) {
 
 TEST(FracToStr, TwoDigits) {
   char buf[8];
-  char *end = frac_to_str_(buf, 46, 10);
+  char *end = frac_to_str_unchecked(buf, 46, 10);
   *end = '\0';
   EXPECT_STREQ(buf, "46");
 }
 
 TEST(FracToStr, ThreeDigits) {
   char buf[8];
-  char *end = frac_to_str_(buf, 456, 100);
+  char *end = frac_to_str_unchecked(buf, 456, 100);
   *end = '\0';
   EXPECT_STREQ(buf, "456");
   EXPECT_EQ(end - buf, 3);
@@ -151,22 +151,22 @@ TEST(FracToStr, ThreeDigits) {
 
 TEST(FracToStr, LeadingZeros) {
   char buf[8];
-  char *end = frac_to_str_(buf, 1, 100);
+  char *end = frac_to_str_unchecked(buf, 1, 100);
   *end = '\0';
   EXPECT_STREQ(buf, "001");
 
-  end = frac_to_str_(buf, 5, 10);
+  end = frac_to_str_unchecked(buf, 5, 10);
   *end = '\0';
   EXPECT_STREQ(buf, "05");
 }
 
 TEST(FracToStr, AllZeros) {
   char buf[8];
-  char *end = frac_to_str_(buf, 0, 100);
+  char *end = frac_to_str_unchecked(buf, 0, 100);
   *end = '\0';
   EXPECT_STREQ(buf, "000");
 
-  end = frac_to_str_(buf, 0, 1);
+  end = frac_to_str_unchecked(buf, 0, 1);
   *end = '\0';
   EXPECT_STREQ(buf, "0");
 }
@@ -174,7 +174,7 @@ TEST(FracToStr, AllZeros) {
 TEST(FracToStr, ZeroDivisor) {
   char buf[8];
   buf[0] = 'X';
-  char *end = frac_to_str_(buf, 0, 0);
+  char *end = frac_to_str_unchecked(buf, 0, 0);
   EXPECT_EQ(end, buf);  // writes nothing
 }