Fitness Calculators & Tools
Free, accurate, and science-backed tools to help you understand your body composition and track your fitness journey.
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Estimate your body fat percentage using the U.S. Navy circumference method. Accurate, simple, and requires only a tape measure.
Evaluate your muscle mass with the Fat-Free Mass Index — a more accurate metric than BMI for assessing muscularity and natural limits.
More tools are on the way
Calculate your Total Daily Energy Expenditure to know exactly how many calories you need for your goals.
Estimate your one-rep max for any lift based on your submaximal performance. Perfect for strength training.
Find your ideal body weight range using multiple scientific formulas and considering your body frame.
Calculate your optimal daily water intake based on weight, activity level, and climate conditions.