Decimaly · Health

Calorie Deficit Calculator

Set a goal weight and date, and see three deficit paths to get there — capped at what’s actually safe, not just what fits your calendar.

Estimates use the Mifflin-St Jeor equation and are not medical advice. Calorie targets are automatically floored at 1,200 kcal/day (women) or 1,500 kcal/day (men), and deficits are capped at 1,000 kcal/day — both NIH-aligned safety limits — regardless of your goal date. If reaching your goal safely would take longer than your target date allows, this tool will tell you that instead of suggesting an unsafe number. Consult a doctor or registered dietitian before starting any weight-loss plan, especially if you have a medical condition or history of disordered eating.