Calculator inputs
Estimate lean body mass from body weight and body fat percentage.
Enter the weight using the unit shown in the label.
Estimated or measured body-fat percentage. Use the most reliable measurement you have available.
Controls rounding in the displayed result only; it does not change the underlying calculation.
How this calculator works
This calculator subtracts estimated fat mass from total body weight.
Use this result as a planning estimate. Real lending, payroll, tax, health or construction outcomes can vary based on official rules, local costs and personal circumstances.
Formula
Worked example
An 80 kg person at 20% body fat has an estimated lean body mass of 64 kg.
Frequently asked questions
Why use this calculator?
It gives a fast estimate and helps compare related scenarios before moving to more detailed planning.
Is the result exact?
No. Treat it as a practical estimate and verify important numbers with official sources or qualified professionals.