Free meal-time tools

Fasting Time Calculator

Calculate how many hours and minutes passed between your last bite and your next meal, including overnight fasts.

How long did I fast?

Finished eating at

Ate again at

Day of the next meal

Time between meals

16 hours, 0 minutes

Worked example

Finish dinner at 8:15 pm on Friday and eat breakfast at 10:45 am on Saturday. Choose Next day: 3 hours 45 minutes before midnight plus 10 hours 45 minutes after midnight gives 14 hours 30 minutes.

If a snack came after dinner, use the time you finished the snack. Select Same day for two meals on the same calendar date. This calculates clock hours; if the clock changed overnight, actual elapsed time can differ.