Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -r8b73263b38f449dacc0795c67a7cf6240cb79026 -rbb63d313f1edeb2fa72f992cedab03b13cdf644a
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 8b73263b38f449dacc0795c67a7cf6240cb79026)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision bb63d313f1edeb2fa72f992cedab03b13cdf644a)
@@ -113,6 +113,8 @@
 #define BP_PWM_FROM_ML_PER_MIN(rate)        ( (rate) * BP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * BP_GEAR_RATIO * BP_MOTOR_RPM_TO_PWM_DC_FACTOR + BP_PWM_ZERO_OFFSET )
 /// Conversion from PWM duty cycle % to commanded pump motor speed.
 #define BP_PWM_TO_MOTOR_SPEED_RPM(pwm)      ( ((pwm) - BP_PWM_ZERO_OFFSET) * 4000.0F )
+/// Conversion macro from mL/min to estimated PWM duty cycle %.
+#define BP_ML_PER_MIN_FROM_PWM(pwm)         ( ( pwm / ( BP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * BP_GEAR_RATIO * BP_MOTOR_RPM_TO_PWM_DC_FACTOR) ) - BP_PWM_ZERO_OFFSET )
 
 /// Measured blood flow is filtered w/ moving average.
 #define SIZE_OF_ROLLING_AVG                 ( ( MS_PER_SECOND / TASK_PRIORITY_INTERVAL ) * 1 )