Weight Loss Calculator
A physiology-based model that estimates fat loss, lean mass changes, calorie deficits, and total weight change during sustained calorie restriction. It can be used for Intermittent Fasting, OMAD, time-restricted eating, or traditional calorie deficit diets. Adjust your inputs to see how your projected weight curve changes over time. For educational purposes only - estimates are based on simplified physiological assumptions and individual results may vary.
Your Starting Point
Enter your baseline parameters.
Calculator Mode
Physiological Parameters
If you don’t know your Body Fat or Bone Mass, leave them blank and we’ll auto-estimate.
Daily Activity
Weight Loss Plan
Model Parameters
Share Your Feedback and Fasting Results
Tried the calculator or completed an extended fast yourself? Share your results, observations, or questions. Real-world experiences help improve this model and help others understand what to expect during multi-day fasting.