diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index 3f371cd829..7866eaa9bd 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -719,6 +719,25 @@ template<class T> class RAMAllocator {
     return ptr;
   }
 
+  T *reallocate(T *p, size_t n) { return this->reallocate(p, n, sizeof(T)); }
+
+  T *reallocate(T *p, size_t n, size_t manual_size) {
+    size_t size = n * sizeof(T);
+    T *ptr = nullptr;
+#ifdef USE_ESP32
+    if (this->flags_ & Flags::ALLOC_EXTERNAL) {
+      ptr = static_cast<T *>(heap_caps_realloc(p, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT));
+    }
+    if (ptr == nullptr && this->flags_ & Flags::ALLOC_INTERNAL) {
+      ptr = static_cast<T *>(heap_caps_realloc(p, size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT));
+    }
+#else
+    // Ignore ALLOC_EXTERNAL/ALLOC_INTERNAL flags if external allocation is not supported
+    ptr = static_cast<T *>(realloc(p, size));  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
+#endif
+    return ptr;
+  }
+
   void deallocate(T *p, size_t n) {
     free(p);  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
   }