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IFWindow
16:8, 18:6, OMAD — pick any protocol.
16:8 means 16 hours fasting, 8 hours eating each day; 18:6 is stricter; OMAD ('one meal a day') is the extreme end — this calculator just does the clock math to show your exact eating window for any split.
Knowing exactly when your eating window opens and closes removes the guesswork and decision fatigue of tracking fasting hours manually throughout the day.
Daily energy expenditure with personalised macro splits.
OpenBody mass index with healthy-range guidance.
OpenUS Navy circumference method for body fat percentage.
OpenDaily hydration target based on weight, activity, and climate.
OpenWhat you entered
Eating window length
24 − 16= 8 hoursBreak fast at
12:00= 12:00 PMStop eating at (start of next fast)
12:00 PM + 8h= 8:00 PMResult
Eating window: 8 hours
On a 16:8 protocol starting at 12:00 PM, eat between 12:00 PM and 8:00 PM, then fast until the next day.