diff --git a/esphome/components/slow_pwm/slow_pwm_output.cpp b/esphome/components/slow_pwm/slow_pwm_output.cpp
index 9b2589e735..8c88b3537c 100644
--- a/esphome/components/slow_pwm/slow_pwm_output.cpp
+++ b/esphome/components/slow_pwm/slow_pwm_output.cpp
@@ -15,7 +15,7 @@ void SlowPWMOutput::loop() {
   uint32_t now = millis();
   float scaled_state = this->state_ * this->period_;
 
-  if (now - this->period_start_time_ > this->period_) {
+  if (now - this->period_start_time_ >= this->period_) {
     ESP_LOGVV(TAG, "End of period. State: %f, Scaled state: %f", this->state_, scaled_state);
     this->period_start_time_ += this->period_;
   }