diff --git a/Marlin/src/inc/Conditionals_post.h b/Marlin/src/inc/Conditionals_post.h
index 1ce79ca7d450..871a9443a8bd 100644
--- a/Marlin/src/inc/Conditionals_post.h
+++ b/Marlin/src/inc/Conditionals_post.h
@@ -2726,12 +2726,6 @@
   #define HAS_FANMUX 1
 #endif
 
-#if FAN_MIN_PWM == 0 && FAN_MAX_PWM == 255
-  #define CALC_FAN_SPEED(f) (f ?: FAN_OFF_PWM)
-#else
-  #define CALC_FAN_SPEED(f) (f ? map(f, 1, 255, FAN_MIN_PWM, FAN_MAX_PWM) : FAN_OFF_PWM)
-#endif
-
 /**
  * Controller Fan Settings
  */