diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 6552029870..38fe44b24c 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -471,14 +471,16 @@ ParseOnOffState parse_on_off(const char *str, const char *on, const char *off) {
 
 static inline void normalize_accuracy_decimals(float &value, int8_t &accuracy_decimals) {
   if (accuracy_decimals < 0) {
+    // Clamp to -9 to keep divisor within uint32_t range (max 10^9 = 1,000,000,000)
+    int8_t dec = accuracy_decimals < -9 ? (int8_t) -9 : accuracy_decimals;
     uint32_t divisor;
-    if (accuracy_decimals == -1) {
+    if (dec == -1) {
       divisor = 10;
-    } else if (accuracy_decimals == -2) {
+    } else if (dec == -2) {
       divisor = 100;
     } else {
       divisor = 1000;
-      for (int8_t i = accuracy_decimals + 3; i < 0; i++)
+      for (int8_t i = dec + 3; i < 0; i++)
         divisor *= 10;
     }
     auto divisor_f = static_cast<float>(divisor);