Calculadora de Massa Corporal Magra
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
LBM = peso × (1 − %gordura/100)
About this calculator
The Lean Body Mass Calculator estimates the weight of your muscles, bones, organs, and body water, excluding fat. The calculation is simple: lean body mass = total weight × (1 − body fat percentage / 100). For example, a person weighing 70 kg with 20% body fat has a lean mass of 56 kg. This tool is useful for quickly assessing body composition, complementing BMI.
Use this calculator to track changes in muscle mass during diets or training. It is especially relevant for athletes, bodybuilders, or people in rehabilitation who want to monitor lean mass gain. The result helps adjust dietary and exercise plans, as weight loss can include both fat and muscle.
Important precautions: the calculation depends on the accuracy of the body fat percentage entered. Methods like bioimpedance, skinfold calipers, or DEXA have error margins. Do not confuse lean body mass with muscle mass: the former includes all non-fat tissues. Consult a healthcare professional to interpret results in your clinical context.
Remember that lean mass varies with age, sex, genetics, and activity level. Men tend to have higher lean mass than women. Use this calculator as a reference, but do not replace detailed medical or nutritional assessments.
Frequently asked questions
What is the difference between lean body mass and muscle mass?
Lean body mass includes muscles, bones, organs, water, and connective tissue, while muscle mass refers only to muscles.
How do I know my body fat percentage to use the calculator?
You can get it via bioimpedance, skinfold calipers, DEXA, or visual estimates. The more accurate the method, the better the result.
Does the calculator work for children or the elderly?
Yes, but interpretation should consider age and health conditions. Consult a professional for proper assessment.
Can I use this calculator to set training goals?
Yes, it helps track lean mass gains. Combine with strength assessments and body measurements for best results.
What if my body fat percentage is very high or very low?
Extreme percentages may indicate health risks. Seek medical or nutritional guidance to adjust diet and exercise.