Lean Body Mass Calculator
Calculate your lean body mass and body fat weight.
Boer Formula:
- • Male: 0.407W + 0.267H − 19.2
- • Female: 0.252W + 0.473H − 48.3
What is Lean Body Mass Calculator?
A lean body mass calculator estimates the weight of everything in your body except fat — muscle, bone, organs, and water.
Lean body mass is a better indicator of fitness than total weight, and it drives your metabolic rate.
How does the Lean Body Mass Calculator work?
The calculator estimates body fat using the US Navy method, then subtracts it from total weight.
It also shows the fat mass and the lean-to-fat ratio.
How to use the Lean Body Mass Calculator?
- Enter your gender, height, weight, and measurements.
- The calculator shows your lean body mass and fat mass.
Example
Try the calculator with your own numbers
- Enter your values in the input fields above.
- Adjust the values to match your situation.
- The result updates instantly as you change the inputs.
Benefits of using the Lean Body Mass Calculator
- Track muscle gain accurately.
- Set body composition goals.
- Understand your metabolic baseline.
Who should use the Lean Body Mass Calculator?
- People tracking their weight, fitness, and daily health numbers.
- Fitness enthusiasts planning workouts, calories, and protein intake.
- Parents monitoring their child's growth and development.
- Anyone preparing for a health check-up or fitness goal.
Tips for getting the most out of the Lean Body Mass Calculator
- Use your most recent measurements for the most accurate result.
- Re-check periodically as your weight, age, or activity level changes.
- Treat the result as a guideline, not a medical diagnosis — consult a professional for health decisions.
Frequently Asked Questions
Why does lean mass matter?
Muscle burns more calories than fat, so higher lean mass raises your metabolism and supports strength and mobility.
How do I increase lean body mass?
Progressive strength training with adequate protein (1.6-2.2 g/kg) and a slight calorie surplus.
Small daily decisions add up. Use this calculator to track your numbers and make healthier choices with confidence.
Related Calculators
Body Fat Calculator
Estimate your body fat percentage using common measurements.
Body Surface Area Calculator
Calculate your body surface area using the Mosteller formula.
BMI Calculator
Calculate your Body Mass Index and category.
Ideal Weight Calculator
Calculate your ideal body weight based on height and gender.
Calorie Calculator
Calculate your daily calorie needs based on age, gender, weight and activity.
Carbohydrate Calculator
Calculate your daily carbohydrate needs based on weight and activity.