Calorie to Kg Calculator
This calculator converts a calorie surplus or deficit into estimated kilograms of body weight change. It uses the common approximation that roughly 7700 calories equals 1 kilogram of body fat. Enter your daily calorie balance and number of days to see the projected weight change.
How it works
Body weight change from calories is estimated using the rule that about 7700 kcal corresponds to 1 kilogram of body fat. The formula is: kg change = (daily calorie balance × days) ÷ calories per kg.
A negative daily balance (eating fewer calories than you burn) produces weight loss, while a positive balance (eating more than you burn) produces weight gain. The result shows your projected change over the entered number of days plus an approximate weekly rate.
Tips
The 7700 kcal-per-kg figure is an average; real-world results vary with water weight, muscle changes, metabolism, and measurement accuracy. A safe sustainable rate of loss is often 0.5–1 kg per week.
To find your daily calorie balance, subtract your total daily energy expenditure (TDEE) from your calorie intake. Track consistently over several weeks for the most reliable picture.
FAQ
How many calories equal 1 kg?
Approximately 7700 calories are stored in 1 kilogram of body fat. This is the standard estimate used to convert calorie surplus or deficit into weight change.
Is the calorie-to-kg conversion exact?
No. It is an approximation. Actual weight change is affected by water retention, glycogen, muscle gain or loss, hormones, and individual metabolism, so results are estimates only.
How fast can I safely lose weight?
Most guidelines suggest aiming for about 0.5 to 1 kg per week, which roughly corresponds to a daily deficit of 500–1000 kcal. Faster loss can risk muscle loss and other issues.