Why are body composition formulas different for men and women?

Because of physiological differences. For women, hip circumference is part of the equation, while for men, only waist and neck measurements are used.

How to Calculate Your Body Composition

Q: What is body composition?

Body composition is the breakdown of your weight into fat mass, muscle mass, and other tissues. It's a more accurate way to assess health than just using body weight alone.

Q: How does the body composition calculator work?

It uses scientifically validated formulas based on your weight, height, and measurements of the waist, neck, and hips (for women) to estimate your body fat percentage and muscle mass.

Discover your body composition with our free body fat and muscle mass calculator designed for both men and women. Find out how it works and why results differ by gender.

Try the body composition calculator

What is body composition?

Body composition refers to the ratio of fat mass, muscle mass, and other body tissues. It's a more insightful health metric than weight alone.

Our free body composition calculator provides instant estimates of your fat and muscle percentages using just a few simple measurements.

Why do body composition formulas differ for men and women?

Women naturally carry more body fat, especially around the hips and thighs. Our calculations reflect these biological differences.

For example, the hip measurement is essential for women, while men only need to input waist and neck measurements.

Illustration of a man on a scale wearing sportswear

How does the body composition calculator work?

Our online body composition calculator is based on proven anthropometric formulas. Just enter:

Your weight and height
Your waist and neck circumference
Hip measurement (for women)

You’ll instantly get:

Your body fat percentage and value in kilograms
Your estimated lean muscle mass in kilograms

A tool for everyone

Whether you're an athlete, on a weight loss journey, or just curious about your body composition, our online body fat and muscle calculator is here to help.

✅ Completely free
✅ No account required
✅ Based on medical-grade calculation methods

Ready to check your stats? Try our body fat and muscle mass calculator now.