diff --git a/esphome/components/es7210/es7210.cpp b/esphome/components/es7210/es7210.cpp
index 4d1f2171e7..9a99e60995 100644
--- a/esphome/components/es7210/es7210.cpp
+++ b/esphome/components/es7210/es7210.cpp
@@ -89,7 +89,7 @@ void ES7210::setup() {
 }
 
 bool ES7210::set_mic_gain(float mic_gain) {
-  this->mic_gain_ = clamp<float>(mic_gain, ES7210_MIC_GAINS[0], ES7210_MIC_GAINS[ES7210_MIC_GAIN_COUNT - 1]);
+  this->mic_gain_ = clamp<float>(mic_gain, ES7210_MIC_GAIN_MIN, ES7210_MIC_GAIN_MAX);
   if (this->setup_complete_) {
     return this->configure_mic_gain_();
   }
@@ -169,14 +169,18 @@ bool ES7210::configure_mic_gain_() {
 }
 
 uint8_t ES7210::es7210_gain_reg_value_(float mic_gain) {
-  for (uint8_t i = 0; i < ES7210_MIC_GAIN_COUNT; i++) {
-    if (mic_gain == ES7210_MIC_GAINS[i]) {
-      return i;
-    } else if (mic_gain < ES7210_MIC_GAINS[i]) {
-      return i - 1;
-    }
+  // reg: 12 - 34.5dB, 13 - 36dB, 14 - 37.5dB
+  mic_gain += 0.5;
+  if (mic_gain <= 33.0) {
+    return (uint8_t) mic_gain / 3;
   }
-  return ES7210_MIC_GAIN_COUNT - 1;
+  if (mic_gain < 36.0) {
+    return 12;
+  }
+  if (mic_gain < 37.0) {
+    return 13;
+  }
+  return 14;
 }
 
 bool ES7210::configure_i2s_format_() {
diff --git a/esphome/components/es7210/es7210.h b/esphome/components/es7210/es7210.h
index 647c27ed52..8f6d9d8136 100644
--- a/esphome/components/es7210/es7210.h
+++ b/esphome/components/es7210/es7210.h
@@ -33,7 +33,6 @@ class ES7210 : public audio_adc::AudioAdc, public Component, public i2c::I2CDevi
   void set_sample_rate(uint32_t sample_rate) { this->sample_rate_ = sample_rate; }
 
   float mic_gain() override { return this->mic_gain_; };
-  float actual_mic_gain() { return ES7210_MIC_GAINS[this->es7210_gain_reg_value_(this->mic_gain_)]; }
 
  protected:
   /// @brief Updates an I2C registry address by modifying the current state
@@ -45,7 +44,7 @@ class ES7210 : public audio_adc::AudioAdc, public Component, public i2c::I2CDevi
 
   /// @brief Convert floating point mic gain value to register value
   /// @param mic_gain Gain value to convert
-  /// @return Corresponding register value closest to but not exceeding specified gain
+  /// @return Corresponding register value for specified gain
   uint8_t es7210_gain_reg_value_(float mic_gain);
 
   bool configure_i2s_format_();
diff --git a/esphome/components/es7210/es7210_const.h b/esphome/components/es7210/es7210_const.h
index 5657f582f5..e5ffea5743 100644
--- a/esphome/components/es7210/es7210_const.h
+++ b/esphome/components/es7210/es7210_const.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <cinttypes>
+
 namespace esphome {
 namespace es7210 {
 
@@ -120,10 +122,8 @@ static const ES7210Coefficient ES7210_COEFFICIENTS[] = {
     {19200000, 96000, 0x01, 0x05, 0x00, 0x01, 0x28, 0x00, 0x00, 0xc8},
 };
 
-static const uint8_t ES7210_MIC_GAIN_COUNT = 15;
-static const float ES7210_MIC_GAINS[ES7210_MIC_GAIN_COUNT] = {
-    0.0, 3.0, 6.0, 9.0, 12.0, 15.0, 18.0, 21.0, 24.0, 27.0, 30.0, 33.0, 34.5, 36.0, 37.5,
-};
+static const float ES7210_MIC_GAIN_MIN = 0.0;
+static const float ES7210_MIC_GAIN_MAX = 37.5;
 
 }  // namespace es7210
 }  // namespace esphome