Intermittent Fasting Calculator
Find your personalized eating and fasting window based on your preferred IF schedule and daily routine.
📊 Suggested Meal Timing
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💡 Tips for Success
How Intermittent Fasting Works
Intermittent fasting restricts eating to a specific daily window, leaving the rest of the day (including sleep) as a fasting period. The most common schedules — 16:8, 18:6, and 20:4 — refer to hours fasting versus hours eating. Rather than dictating what you eat, IF focuses on when you eat, which many people find simpler to follow consistently than traditional calorie-counting diets.
16:8 (Beginner): 16 hours fasting, 8-hour eating window — e.g. skip breakfast, eat 12pm-8pm
18:6 (Intermediate): 18 hours fasting, 6-hour eating window — more fat-burning time, still manageable
20:4 (Advanced / "Warrior Diet"): 20 hours fasting, 4-hour eating window — typically one larger meal plus a small snack
Frequently Asked Questions
Yes — water, black coffee, and plain tea are generally considered fine and don't break a fast, since they contain negligible calories. Avoid anything with sugar, cream, or calories.
IF can support weight loss mainly by making it easier to eat fewer calories overall — the eating window naturally limits opportunities to snack. Total calorie intake still determines weight change.
No — it's not recommended for pregnant or breastfeeding women, people with a history of eating disorders, or those with certain medical conditions like diabetes without medical supervision. Consult a doctor before starting.
Adequate protein intake during your eating window, combined with resistance training, helps preserve muscle mass during intermittent fasting — similar to any calorie-controlled approach.
Most people report adapting to hunger cues within 1-2 weeks. Visible results depend on consistency and overall calorie intake, typically becoming noticeable over several weeks.
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