diff --git a/esphome/components/light/light_transformer.h b/esphome/components/light/light_transformer.h
index 079c2d2ae0..b9535c834c 100644
--- a/esphome/components/light/light_transformer.h
+++ b/esphome/components/light/light_transformer.h
@@ -44,12 +44,11 @@ class LightTransformer {
   /// The progress of this transition, on a scale of 0 to 1.
   float get_progress_() {
     uint32_t now = esphome::millis();
-    if (now < this->start_time_)
-      return 0.0f;
-    if (now >= this->start_time_ + this->length_)
+    uint32_t elapsed = now - this->start_time_;
+    if (elapsed >= this->length_)
       return 1.0f;
 
-    return clamp((now - this->start_time_) / float(this->length_), 0.0f, 1.0f);
+    return clamp(elapsed / float(this->length_), 0.0f, 1.0f);
   }
 
   uint32_t start_time_;
diff --git a/esphome/components/light/transformers.h b/esphome/components/light/transformers.h
index a26713b723..b6e5e08f2b 100644
--- a/esphome/components/light/transformers.h
+++ b/esphome/components/light/transformers.h
@@ -78,7 +78,7 @@ class LightFlashTransformer : public LightTransformer {
   optional<LightColorValues> apply() override {
     optional<LightColorValues> result = {};
 
-    if (this->transformer_ == nullptr && millis() > this->start_time_ + this->length_ - this->transition_length_) {
+    if (this->transformer_ == nullptr && millis() - this->start_time_ > this->length_ - this->transition_length_) {
       // second transition back to start value
       this->transformer_ = this->state_.get_output()->create_default_transition();
       this->transformer_->setup(this->state_.current_values, this->get_start_values(), this->transition_length_);