What is the Lean Body Mass Calculator?
Estimate lean body mass with the Boer formula. Our health and fitness calculators use validated, published equations — such as Mifflin-St Jeor for metabolic rate and the U.S. Navy method for body fat — to give you a solid starting point for training and nutrition.
How to use the Lean Body Mass Calculator
- Enter your sex, your weight, your height.
- Results update automatically as you type; you can also press Calculate.
- Read the output: lean body mass, estimated body fat.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With sex = Male, weight = 80 kg, height = 180 cm, the Lean Body Mass Calculator returns lean body mass: 61.4 kg; estimated body fat: 23.2%.
Tips for better results
- Equations estimate population averages; your individual numbers may differ.
- Track trends over weeks rather than reacting to a single reading.
- Pair calculators with professional guidance for medical conditions, pregnancy or major diet changes.
⚠️ This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Frequently asked questions
What does the Lean Body Mass Calculator do?
Estimate lean body mass with the Boer formula.
How is it calculated?
The Lean Body Mass Calculator uses this method: Men: 0.407W + 0.267H − 19.2; Women: 0.252W + 0.473H − 48.3.
Can you show an example?
With sex = Male, weight = 80 kg, height = 180 cm, the Lean Body Mass Calculator returns lean body mass: 61.4 kg; estimated body fat: 23.2%.
Is the Lean Body Mass Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Is this tool free and private?
Yes — the Lean Body Mass Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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