Calculate your lean body mass index using weight, height, and gender metrics.
Calculator Parameters
Enter details and click calculate to view the results instantly.
Calculation Examples
Scenario Inputs
Output Result
gender : male , weight : 80, height : 180
Estimated Lean Mass: ~ 61.5 kg
About Lean Body Mass Calculator
Lean Body Mass (LBM) Calculator. Calculate your lean body mass index using weight, height, and gender metrics. Starlightopia provides this tool completely free and online, optimized for instant, accurate computations.
How It's Calculated
How do you calculate lean body mass?
Lean Body Mass = Total Weight - (Total Weight x Body Fat Percentage).
Technical Specifications
CategoryHealth
Target ValueLean Mass Value
Inputs Required (3)
Gender (select)
Weight (kg) (number)
Height (cm) (number)
Frequently Asked Questions
What is lean body mass (LBM)?
Lean body mass is your total body weight minus your body fat mass, representing the weight of muscles, bones, organs, and water.
How do you calculate lean body mass?
Lean Body Mass = Total Weight - (Total Weight x Body Fat Percentage).
Why is LBM important for strength athletes?
Tracking LBM helps athletes monitor muscle growth and adjust their training without being misled by changes in water or fat weight.
What is the Boer formula for lean body mass?
The Boer formula is a widely accepted mathematical equation that uses weight and height metrics to estimate an individual's LBM.
Does losing weight always reduce lean body mass?
A calorie deficit can lead to a slight drop in LBM, but eating enough protein and doing resistance training helps preserve muscle.