diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index bd3a4def05..7de952a712 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -348,6 +348,8 @@ template<typename T> class FixedVector {
 
   size_t size() const { return size_; }
   bool empty() const { return size_ == 0; }
+  size_t capacity() const { return capacity_; }
+  bool full() const { return size_ == capacity_; }
 
   /// Access element without bounds checking (matches std::vector behavior)
   /// Caller must ensure index is valid (i < size())