Get input for lean-mass estimate.
Lean Body Mass Calculator
Estimate non-fat mass and interpret body composition changes more clearly.
Use consistent body-fat input sources for better trend quality.
Result Interpretation
Lean body mass helps separate composition change from scale-only change. This is useful when deciding whether a cut or gain phase is moving in the right direction.
Formula
Lean Body Mass = body weight x (1 - body fat / 100)
Practical Usage
Track lean mass trend alongside performance and recovery. If scale weight rises but estimated lean mass and performance do not improve, gain pace may be too aggressive. If weight drops quickly and lean mass falls sharply, deficit may be too large.
Best workflow: estimate body fat first, calculate lean mass, set calories with TDEE/calorie tools, then log adherence in Diet Log.
Limitations
Output quality depends on body-fat estimate quality. Focus on trend direction over repeated check-ins.
FAQ
Is this a medical-grade measurement?
No. It is a planning estimate for trend analysis.
How often should I recalculate?
Every 2 to 4 weeks is usually enough.
Can lean mass rise while bodyweight is stable?
Yes, small recomposition is possible.
Should this be used with body-fat and BMI?
Yes. Multi-metric context improves decisions.
What should I do after calculating?
Adjust calorie strategy only after reviewing trend data and adherence.
Related Calculators
Add screening context.
Set calorie baseline from current stats.
Track consistency against targets.