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Eating window
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Fasting window
During the fast, water, black coffee and unsweetened tea are allowed. Drink plenty of water to succeed.
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How it works
Intermittent fasting splits your day into an eating window and a fasting window. For example 16:8 = 16 hours fasting + 8 hours eating. Choose when your eating window starts, and the calculator shows exactly when to eat and when to fast.
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Frequently asked questions
What is the 16:8 protocol?
16 hours of fasting and an 8-hour eating window. For example eating from 12:00 to 20:00, and fasting from 20:00 to 12:00 the next day. The most popular and beginner-friendly protocol.
What can I drink while fasting?
Water, black coffee and unsweetened tea (no sugar or milk). They don't break the fast. Staying well hydrated is important.
Does fasting cause weight loss?
It helps reduce calorie intake, but weight loss depends on your total daily calories. Calculate your calorie target.