What Is Body Composition?
Body composition describes what the body is made of, usually divided into fat mass and lean mass (muscle, bone, organs, and water). Two people with the same weight and BMI can have very different body compositions, which is why body fat percentage is used alongside BMI.
Measurement Methods
Methods include skinfold calipers, bioelectrical impedance scales, circumference-based formulas, and DEXA scans, which vary in accuracy and cost.
Key Figures
Body fat percentage and lean body mass are the most common summary numbers.
🧮 Calculate It Yourself
Put Body Composition into practice with these free calculators — no sign-up, nothing stored.
🔗 Related Terms
More Health & Fitness Terms
- Basal Metabolic Rate (BMR)
- Calorie
- Calorie Deficit
- Circadian Rhythm
- Estimated Due Date (EDD)
- Fertile Window
📖 Browse all glossary terms or explore all free calculators.
Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.