Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Health
Calorie Deficit & Weight Loss Calculator
Estimate how much weight you'll lose over a set number of weeks from your daily calorie deficit and exercise. Based on the well-established rule that ~7,700 kcal equals roughly 1 kg of body fat.
Fill in the required fields to see your result.
Fitness
BMI Calculator
Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions.
Fill in the required fields to see your result.
Key differences
| Calorie Deficit & Weight Loss Calculator | BMI Calculator | |
|---|---|---|
| Category | Health | Fitness |
| Inputs required | 4 | 2 |
| Result | Estimated Weight Loss (kg) | Your BMI |
| What it does | Estimate how much weight you'll lose over a set number of weeks from your daily calorie deficit and exercise. Based on the well-established rule that ~7,700 kcal equals roughly 1 kg of body fat. | Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions. |