Muscle Mass Calculator
muscle mass calculator. Get instant, accurate results. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
Lee Equation: SM(kg) = 0.244 x BW + 7.80 x Ht(m) - 0.098 x Age + 6.6 x Sex - 3.3 | LBM = Weight x (1 - BF%)
The Lee equation estimates appendicular skeletal muscle mass from height, weight, age, and sex. Alternative: Lean Body Mass = total weight x (1 - body fat percentage). Average muscle mass: men 36-42% of body weight, women 29-35%.
Worked Examples
Example 1: 75kg male, 1.75m
Problem:75kg, 1.75m, 30yr, male
Solution:SM = 0.244(75) + 7.80(1.75) - 0.098(30) + 6.6(1) - 3.3 = 31.9 kg
Result:31.9 kg muscle mass (42.5% of body weight)
Frequently Asked Questions
What is the difference between mass and weight?
Mass measures the amount of matter in an object (kilograms) and is constant everywhere. Weight is the gravitational force on that mass (newtons) and varies by location. On Earth, a 1 kg object weighs about 9.8 newtons. In everyday use, the terms are often used interchangeably.
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy