Intermittent Fasting Schedule Calculator
Enter your preferred eating window start time and fasting protocol to instantly see your eating and fasting windows, plus a 24-hour visual timeline.
Common questions
What is intermittent fasting?
Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating. It doesn't specify which foods to eat but rather when you eat them. It works with your body's natural circadian rhythms to improve metabolic health.
What are the benefits of 16:8 intermittent fasting?
The 16:8 protocol fasts for 16 hours and eats within an 8-hour window. Research shows benefits including improved insulin sensitivity, support for weight management, reduced inflammation, enhanced autophagy (cellular repair), and better metabolic markers. It's widely considered the most sustainable IF protocol for beginners.
Can you drink water while fasting?
Yes — water, sparkling water, black coffee, and plain tea are permitted during the fasting window. They contain no meaningful calories and will not break your fast. Staying well-hydrated during fasting periods is important and can help manage hunger.
Who should not do intermittent fasting?
IF is not recommended for pregnant or breastfeeding women, children and teenagers, people with a history of eating disorders, those with type 1 diabetes or certain other medical conditions, and people who are underweight. Always consult your doctor or a registered dietitian before starting any fasting protocol.