Lean Body Mass Calculator Guide: Formula & Worked Example
Short answer
Weight of everything except body fat (Boer formula). In the fixed example below, lean body mass is 56 kg. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Lean Body Mass Calculator calculation using gender, weight, height
The inputs are gender, weight, height. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Gender
- m
- Weight
- 70
- Height
- 175
- Lean body mass: 56 kg
- Body fat (estimated): 20%
Understanding the result
Weight of everything except body fat (Boer formula). Start with the base example, then replace each value with the figure that matches your situation.
Gender
The example uses Male for gender. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Weight
The example uses 70 kg for weight. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Height
The example uses 175 cm for height. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The comparison changes only weight, keeping every other example input fixed. This isolates that input's effect on the primary result. It does not predict future outcomes.
This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Lower input | Weight: 56 kg | Lean body mass: 50.3 kg |
| Base example | Weight: 70 kg | Lean body mass: 56 kg |
| Higher input | Weight: 84 kg | Lean body mass: 61.7 kg |
Common mistakes
- Using the wrong units for weight.
- Comparing results while changing more than one input at a time.
- This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.
Checklist
- Confirm gender.
- Confirm weight is expressed in kg.
- Confirm height is expressed in cm.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.