Fitness & Body Composition Calculators

13 free calculators to track body composition, ideal weight, and fitness metrics.

BMI

Calculate your BMI Prime and classification relative to ideal BMI.

Estimate your body fat percentage using Navy or skinfold method.

Calculate your lean body mass and fat-free body weight.

Measure your waist-to-hip ratio and associated health risk.

Calculate body surface area (BSA) using standard formulas.

Estimate your skeletal muscle mass from body measurements.

Find your ideal body weight range based on height and frame.

Find the healthy BMI weight range for your height.

Calculate body fat using the US Army tape measurement method.

Calculate body fat using the US Navy circumference method.

Determine small, medium, or large frame based on wrist and height.

Find your somatotype: ectomorph, mesomorph, or endomorph.

Estimate your metabolic age based on BMR compared to averages.