Intermittent fasting calculator

Enter your values

Set the eating window first, then turn it into a practical meal-timing plan.

All required fields must be filled in.

Eating Window

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Enter a protocol, wake time, first meal time, calories, and meal count to build a fasting schedule.

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Example calculations

Tap an example to prefill the calculator with sample values.

Standard 16:8 workday

Wake at 6:30 AM, first meal at noon, two meals

A common time-restricted-eating rhythm that keeps the feeding window aligned with lunch and dinner.

Result: A fixed window makes the meal-timing side clear even before deciding what foods belong inside it.

18:6 training day

Later first meal with three smaller meals

Useful for people who prefer a tighter eating window but still want more than two feedings inside it.

Result: More meals can fit inside a shorter window if the schedule is tight and intentional.

OMAD experiment

Single evening meal after a long fasting period

A more aggressive schedule where meal size and daily sustainability deserve extra caution.

Result: Very narrow windows can look simple on paper but still require a more careful sustainability check.

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