Health & Fitness Calculators

Calculate body mass index, see your category, and find the weight range that would put you in the healthy band.

Estimate body fat percentage with the US Navy circumference method, plus lean mass and category.

Find your BMR, maintenance calories, and daily targets for losing, maintaining, or gaining weight.

Calculate your five training zones from maximum and resting heart rate using the Karvonen method.

Split your calorie target into protein, carbohydrate, and fat grams for your goal and training style.

Find your daily protein target based on body weight, goal, and training volume — with per-meal distribution.

Convert between pace, speed, and finish time, and get equivalent race predictions and training paces.

Estimate daily fluid needs based on body weight, activity, climate, and exercise duration.