Lean Body Mass Calculator
Enter your weight, height and sex to estimate lean body mass using the Boer formula.
Lean Body Mass Calculator
Estimate lean body mass and fat mass from weight, height and sex using the Boer formula.
Lean body mass is your total body weight minus fat mass — muscle, bone, organs and water. The Boer formula estimates it from weight, height and sex without needing body fat measurement equipment, making it a convenient (if approximate) estimate.
Example
- With the default values shown above, this calculator returns: Lean Body Mass ≈ 54.7; Estimated Fat Mass ≈ 15.3.
Frequently Asked Questions
What is lean body mass used for?
It is often used to estimate protein needs, set strength-training goals, or track body composition changes alongside (not instead of) total body weight.
How accurate is the Boer formula?
It is a reasonable population-level estimate but, like all formula-based methods, can be less accurate for people with atypical body composition, such as very muscular or very lean individuals.