Fasting Calculators
Explore our comprehensive suite of calculators designed to help you optimize your fasting journey. Whether you're new to intermittent fasting or an experienced faster, we have tools to support your goals.
Intermittent Fasting Calculator
Calculate your eating window and fasting period for 16:8, 18:6, 20:4, and other popular methods.
Calculate Now →16:8 Fasting Calculator
Plan your 16-hour fast with an 8-hour eating window, the most popular intermittent fasting method.
Calculate Now →Water Fasting Calculator
Estimate potential weight loss and track your progress during water-only fasts.
Calculate Now →5:2 Diet Calculator
Plan your 5:2 intermittent fasting diet with calorie calculations for fasting days.
Calculate Now →One Meal A Day (OMAD) Calculator
Plan your single meal per day and maximize the benefits of extended daily fasting.
Calculate Now →Weight Loss Fasting Calculator
Calculate potential weight loss from various fasting protocols based on your metrics.
Calculate Now →Extended Fast Calculator
Plan and track your 24-hour, 36-hour, 48-hour, or 72-hour extended fasts.
Calculate Now →Alternate Day Fasting Calculator
Calculate your eating and fasting days for the alternate day fasting protocol.
Calculate Now →Dry Fasting Calculator
Advanced calculator for dry fasting protocols (no food or water). For experienced fasters only.
Calculate Now →Why Use Our Fasting Calculators?
Science-Based Formulas
Our calculators use evidence-based formulas from nutritional science and metabolism research.
Personalized Results
Get custom recommendations based on your age, gender, weight, height, and activity level.
Clear Guidance
Receive easy-to-understand advice for implementing your chosen fasting protocol safely.
Important Considerations
Fasting is not appropriate for everyone. It's generally not recommended for:
- Pregnant or breastfeeding women
- Children under 18
- People with a history of eating disorders
- Individuals with certain medical conditions (e.g., diabetes)
- Those who are underweight
Always consult with a healthcare professional before starting any fasting regimen, especially if you have medical concerns or are taking medications.