Intermittent Fasting Window Calculator

Calculate the number of fasting hours per day based on a chosen daily eating window, such as the popular 16:8 method.

Inputs
Results
Fasting Window
16 hours

Try an example

Formula

Fasting Hours = 24 − Eating Window Hours

Learn How This Works

Meal Timing and Daily Nutrition Targets

Intermittent fasting windows, calories per serving, weekly caloric surplus, daily hydration, added sugar, and UK alcohol units — six calculations for daily nutrition planning.

Frequently Asked Questions

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