Lean Body Mass Calculator
Estimate lean body mass from your body weight and body fat percentage. Informational only, not medical advice.
Lean body mass is estimated as total weight × (1 − body fat fraction).
Privacy: runs locally in your browser. No values are stored or transmitted.
How it works
This calculator uses lean body mass = total body weight × (1 − body fat fraction). Fat mass is then the remainder of total body weight.
Examples
- 70 kg at 20% body fat → lean body mass ≈ 56 kg
- 154 lb at 18% body fat → lean body mass ≈ 126.28 lb
- Useful for simple body composition estimates
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What is lean body mass?
Lean body mass is body weight minus fat mass. It includes muscle, bone, organs, water, and other non-fat tissue.
- Is this the same as muscle mass?
No. Lean body mass includes muscle, but it also includes other non-fat tissue such as bone, water, and organs.
- How is lean body mass estimated here?
This calculator uses your body weight and body fat percentage to estimate how much of your weight is non-fat mass.
- Can I use pounds or kilograms?
Yes. This calculator supports both metric and imperial input.
- Are my values stored?
No. All calculations run locally in your browser.