Body Composition Calculators

Calculate your body fat percentage using the same circumference-based method used for U.S. Army body composition standards.

Calculate your Body Mass Index (BMI) to see where your weight falls relative to your height, using standard health categories.

Estimate your body fat percentage from simple tape measurements using the U.S. Navy method — no calipers or scans required.

Calculate your body surface area using your height and weight with the Mosteller formula.

Estimate your frame size from wrist circumference and height, plus an informal ecto/meso/endomorph body-type label — descriptive, not diagnostic.

Calculate your Fat-Free Mass Index (FFMI) to estimate your muscularity relative to your height, adjusted for a fair comparison across body sizes.

Get a general reference point for a healthy body weight, based on your height and a well-known clinical formula.

Estimate your lean body mass using your height, weight, and the Boer formula — separate from fat mass.

Get a risk-indicator estimate for visceral fat using waist-to-height ratio and waist circumference thresholds — with the real limitations of this method stated upfront.

Calculate your waist-to-height ratio to assess body fat distribution and better understand your health risk.

Calculate your waist-to-hip ratio to better understand your body fat distribution and potential health risks.