Free Tool
Lean Body Mass Calculator | Lean Body Mass
Calculate your lean body mass (total weight minus fat)
Built by an engineer who chases finish lines and is obsessed with data. Thomas Prommer — technology executive who has worked with Google, Apple, Nike, Adidas, Netflix and other global brands. Also an Ironman finisher, HYROX Pro Division competitor, and marathon runner. These tools combine engineering rigor with real race experience.
Lean Body Mass Calculator
Calculate your lean body mass (total weight minus fat)
Methodology
Boer formula or weight × (1 - body fat %)
FAQ
What is Lean Body Mass?
Calculate your lean body mass (total weight minus fat).
How is it calculated?
Boer formula or weight × (1 - body fat %)
How accurate is this?
This provides a reasonable estimate. Professional measurement recommended for clinical use.
Who should use this?
Athletes, fitness enthusiasts, and anyone tracking body composition.