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Water Fasting Weight Loss Estimator
Estimate caloric deficit and fat loss during a water fast based on body weight and activity.
Results
Estimated Fat Loss0.49 kg
Estimated Water Loss1.96 kg
Estimated Total Loss2.45 kg
What is it?
Estimates the breakdown of weight loss during a water-only fast, separating fat loss from water and glycogen depletion.
How to use
Enter your body weight, planned fasting duration, and activity level. Results are educational estimates only.
Example scenario
A 3-day fast at light activity (~1800 kcal/day) burns ~5400 kcal total, yielding roughly 0.5 kg of fat loss and 2.0 kg total weight change.
Pro tip
Disclaimer: Extended fasting should only be done under medical supervision. This calculator is for educational purposes only.