Intermittent Fasting Window Calculator
Following 16:8, 18:6 or another intermittent fasting plan? Choose your protocol and enter when your fast starts — usually when your last meal ends — and this tool gives you the exact clock times your eating window opens and closes.
Enter your details above and the result will appear here.
How to use
- Choose your fasting protocol.
- Enter the time your fast begins, usually when your last meal ends.
- Read when you can eat again and when the eating window closes.
- Plan your meals inside the window shown, so fasting and eating hours stay consistent each day.
Note
This is clock arithmetic only: eating window opens after the fasting hours and closes after the eating hours. Fasting is not suitable for everyone — including during pregnancy, for people with diabetes on medication, or with a history of eating disorders — without medical guidance. Estimate only — not medical advice.