From 834241dfb531261769ce752443c529cdb357882f Mon Sep 17 00:00:00 2001
From: ellensp <530024+ellensp@users.noreply.github.com>
Date: Thu, 15 Jan 2026 15:19:45 +1300
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20ADC=20calculation=20(#2827?=
 =?UTF-8?q?9)?=
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Followup to 89379cd
---
 Marlin/src/HAL/ESP32/HAL.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/HAL/ESP32/HAL.cpp b/Marlin/src/HAL/ESP32/HAL.cpp
index acfec29b2f..9adff634a0 100644
--- a/Marlin/src/HAL/ESP32/HAL.cpp
+++ b/Marlin/src/HAL/ESP32/HAL.cpp
@@ -271,7 +271,8 @@ void MarlinHAL::adc_start(const pin_t pin) {
   uint32_t mv;
   esp_adc_cal_get_voltage((adc_channel_t)chan, &characteristics[attenuations[chan]], &mv);
 
-  adc_result = (mv * 1023) * (1000.f / (ADC_REFERENCE_VOLTAGE));
+  static constexpr uint32_t adc_divisor = uint32_t((ADC_REFERENCE_VOLTAGE) * 1000UL);
+  adc_result = (mv * 1023UL) / adc_divisor;
 
   // Change the attenuation level based on the new reading
   adc_atten_t atten;