Weight Loss Calculator
Daily calorie deficit needed to lose a target amount of weight.
weeks
Formula: ≈7700 kcal per kg of fat
Worth Knowing
This works from the well-known figure that roughly 7,700 kcal equals a kilogram of body fat, so a daily 500-calorie deficit predicts about half a kilo lost per week. Real results run slower than the math suggests, because metabolism adapts downward as you lose weight and early drops include water rather than pure fat. A deficit of 15–25% below maintenance is generally sustainable; deeper cuts risk muscle loss and rarely hold up over time.
How to Use
- Enter Weight to lose into the first field of the Weight Loss Calculator.
- Fill in the rest: Timeframe.
- Your result appears instantly as you type — there's no submit button or page reload.
Formula
≈7700 kcal per kg of fat