diff --git a/esphome/components/hm3301/abstract_aqi_calculator.h b/esphome/components/hm3301/abstract_aqi_calculator.h
index 42d900a262..038828e9de 100644
--- a/esphome/components/hm3301/abstract_aqi_calculator.h
+++ b/esphome/components/hm3301/abstract_aqi_calculator.h
@@ -7,7 +7,7 @@ namespace hm3301 {
 
 class AbstractAQICalculator {
  public:
-  virtual uint8_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) = 0;
+  virtual uint16_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) = 0;
 };
 
 }  // namespace hm3301
diff --git a/esphome/components/hm3301/aqi_calculator.h b/esphome/components/hm3301/aqi_calculator.h
index 08d1dc2921..6c830f9bad 100644
--- a/esphome/components/hm3301/aqi_calculator.h
+++ b/esphome/components/hm3301/aqi_calculator.h
@@ -7,7 +7,7 @@ namespace hm3301 {
 
 class AQICalculator : public AbstractAQICalculator {
  public:
-  uint8_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) override {
+  uint16_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) override {
     int pm2_5_index = calculate_index_(pm2_5_value, pm2_5_calculation_grid_);
     int pm10_0_index = calculate_index_(pm10_0_value, pm10_0_calculation_grid_);
 
diff --git a/esphome/components/hm3301/caqi_calculator.h b/esphome/components/hm3301/caqi_calculator.h
index 1ec61f2416..3f338776d8 100644
--- a/esphome/components/hm3301/caqi_calculator.h
+++ b/esphome/components/hm3301/caqi_calculator.h
@@ -8,7 +8,7 @@ namespace hm3301 {
 
 class CAQICalculator : public AbstractAQICalculator {
  public:
-  uint8_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) override {
+  uint16_t get_aqi(uint16_t pm2_5_value, uint16_t pm10_0_value) override {
     int pm2_5_index = calculate_index_(pm2_5_value, pm2_5_calculation_grid_);
     int pm10_0_index = calculate_index_(pm10_0_value, pm10_0_calculation_grid_);
 
diff --git a/esphome/components/hm3301/hm3301.cpp b/esphome/components/hm3301/hm3301.cpp
index a2bef2a01d..379c4dbc5a 100644
--- a/esphome/components/hm3301/hm3301.cpp
+++ b/esphome/components/hm3301/hm3301.cpp
@@ -62,7 +62,7 @@ void HM3301Component::update() {
     pm_10_0_value = get_sensor_value_(data_buffer_, PM_10_0_VALUE_INDEX);
   }
 
-  int8_t aqi_value = -1;
+  int16_t aqi_value = -1;
   if (this->aqi_sensor_ != nullptr && pm_2_5_value != -1 && pm_10_0_value != -1) {
     AbstractAQICalculator *calculator = this->aqi_calculator_factory_.get_calculator(this->aqi_calc_type_);
     aqi_value = calculator->get_aqi(pm_2_5_value, pm_10_0_value);