Intermittent Fasting Calculator
Plan your intermittent fasting schedule and track your fasting and eating windows. Enter your desired fasting duration and start time to get a personalized schedule with reminders and tips.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Intermittent Fasting Calculator
- Enter Fasting Duration — Input the number of hours you plan to fast (e.g., 16). Must be between 1 and 48.
- Set Start Time — Choose the time of your last meal (e.g., 8:00 PM). Use the 24-hour format if needed.
- Click "Calculate Schedule" — Your fasting and eating windows will appear below.
- Read the Results:
- Fasting Window — The period you avoid food (from start time to end of fast).
- Eating Window — The period you can eat (24 hours minus fasting hours).
- Tip — A suggestion based on your fasting length.
Note: All times are in 24-hour format. The calculator automatically adjusts for overnight fasts. No other settings needed.
Previous Results
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Frequently Asked Questions
Intermittent fasting is an eating pattern that cycles between periods of fasting and eating. It does not specify which foods to eat but rather when you should eat them.
Common methods include the 16:8 method (16 hours fasting, 8 hours eating), 18:6, 20:4, and alternate-day fasting.
Yes, water, black coffee, and unsweetened tea are generally allowed during fasting periods as they contain minimal calories.
