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Intermittent Fasting Calculator
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Calculate your fasting and eating windows for 16:8, 18:6, 20:4, and 5:2 protocols.
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A free Intermittent Fasting Calculator that calculates your fasting and eating windows for popular IF protocols including 16:8, 18:6, 20:4, 14:10, 12:12, and OMAD. Simply enter your fasting start time and get your exact eating window schedule.
How to Use Intermittent Fasting Calculator
Select your intermittent fasting protocol, enter the time you want to start fasting, and click Calculate. The tool shows your fasting start, eating window open, and eating window close times — with personalized tips for each protocol.
Features
- ✓ Supports 6 popular IF protocols
- ✓ 12-hour and 24-hour time formats
- ✓ Protocol-specific tips and advice
- ✓ Instant schedule calculation
- ✓ Beginner-friendly explanations
Use Cases
- → Planning your 16:8 daily fasting schedule
- → Trying a new IF protocol
- → Setting eating window reminders
- → Comparing different fasting methods
Frequently Asked Questions
The 14:10 or 16:8 protocol is recommended for beginners. They allow an 8–10 hour eating window which is easy to maintain alongside a normal lifestyle.
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