diff --git a/esphome/components/duty_cycle/duty_cycle_sensor.cpp b/esphome/components/duty_cycle/duty_cycle_sensor.cpp
index aed22312a7..9a881c81f0 100644
--- a/esphome/components/duty_cycle/duty_cycle_sensor.cpp
+++ b/esphome/components/duty_cycle/duty_cycle_sensor.cpp
@@ -23,22 +23,24 @@ void DutyCycleSensor::dump_config() {
 }
 void DutyCycleSensor::update() {
   const uint32_t now = micros();
+  const uint32_t last_interrupt = this->store_.last_interrupt;  // Read the measurement taken by the interrupt
+  uint32_t on_time = this->store_.on_time;
+
+  this->store_.on_time = 0;  // Start new measurement, exactly aligned with the micros() reading
+  this->store_.last_interrupt = now;
+
   if (this->last_update_ != 0) {
     const bool level = this->store_.last_level;
-    const uint32_t last_interrupt = this->store_.last_interrupt;
-    uint32_t on_time = this->store_.on_time;
 
     if (level)
       on_time += now - last_interrupt;
 
     const float total_time = float(now - this->last_update_);
 
-    const float value = (on_time / total_time) * 100.0f;
+    const float value = (on_time * 100.0f) / total_time;
     ESP_LOGD(TAG, "'%s' Got duty cycle=%.1f%%", this->get_name().c_str(), value);
     this->publish_state(value);
   }
-  this->store_.on_time = 0;
-  this->store_.last_interrupt = now;
   this->last_update_ = now;
 }