Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Lean Body Mass Calculator
Estimate your lean body mass — everything except fat — from height, weight, and sex using the Boer formula. Useful for setting protein, calorie, and medication targets.
BMR / TDEE Calculator
Estimate your daily calorie needs using the revised Harris-Benedict equation, then adjust for activity to get your Total Daily Energy Expenditure (TDEE) — the rough number of calories you burn in 24 hours when you eat a maintenance diet. Enter your weight in kilograms, height in centimetres, age, biological sex, and an activity multiplier (sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extremely active 1.9). The result is what most nutrition guides call your "maintenance calories" — a starting point for designing a deficit (to lose weight), a surplus (to gain muscle), or a recomposition plan.
Key differences
| Lean Body Mass Calculator | BMR / TDEE Calculator | |
|---|---|---|
| Category | Health | Health |
| Inputs required | 3 | 5 |
| Result | Lean Body Mass (kg) | Daily Calorie Needs (calories) |
| What it does | Estimate your lean body mass — everything except fat — from height, weight, and sex using the Boer formula. Useful for setting protein, calorie, and medication targets. | Estimate your daily calorie needs using the revised Harris-Benedict equation, then adjust for activity to get your Total Daily Energy Expenditure (TDEE) — the rough number of calories you burn in 24 hours when you eat a maintenance diet. Enter your weight in kilograms, height in centimetres, age, biological sex, and an activity multiplier (sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extremely active 1.9). The result is what most nutrition guides call your "maintenance calories" — a starting point for designing a deficit (to lose weight), a surplus (to gain muscle), or a recomposition plan. |