Fitness Calculators

Free tools to measure your body composition. Pick a calculator below to get your number in seconds.

FFMI Calculator

Find your Fat-Free Mass Index and see how your muscle development compares to natural lifting standards.

Estimate how much of your weight is muscle, bone, and organs using the Boer, James, and Hume formulas.

Measure your body fat percentage using the U.S. Navy formula. Enter your neck, waist, and hip measurements for an instant estimate.

Track your simultaneous fat loss and muscle gain progress with projections tailored to your training experience and goals.