Calories to Fat Calculator
Convert a calorie surplus or deficit to kilograms or pounds of body fat.
How to use this tool
- Enter calorie surplus/deficit in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your body fat and the full breakdown beneath it.
One kilogram of body fat stores approximately 7,700 kcal. Use this tool to translate any calorie surplus or deficit into fat gained or lost.
Frequently asked questions
- Is 1 lb of fat really 3,500 calories?
- The 3,500 kcal/lb figure is an approximation. The more precise value is ~7,700 kcal/kg which equals ~3,500 kcal/lb (since 7700 ÷ 2.205 ≈ 3,493). In practice, actual loss is slower because the body adapts metabolically.
- Why doesn't my weight loss match this calculation?
- Real weight change also includes water retention, glycogen changes, and metabolic adaptation. The calculation gives a theoretical estimate, not a guarantee.