Calories
Basal metabolic rate (BMR) from the Mifflin–St Jeor equation and total daily energy expenditure (TDEE) by activity level.
Open calculatorIntermittent fasting window
Enter the hour of your last evening meal and the hour of your first meal the next day (0–23 clock). The calculator handles overnight rollovers across midnight automatically.
Fasting duration
16 h
Eating window
8 h
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A classic 16:8 schedule is last meal at 20:00 and first meal at 12:00 the next day.
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Educational estimate only. Not medical, tax, legal or financial advice.