Health & Fitness

Free health and fitness calculators — hydration, macros, heart-rate zones, training and more. Instant, private and running entirely in your browser.

10 tools

Estimate your daily water needs based on weight, exercise and climate, shown in litres, cups and bottles.

Split your daily calories into protein, carbs and fat with diet-style presets and a per-meal breakdown.

Calculate your 5 training heart-rate zones using the Karvonen method with your resting heart rate.

Estimate calories burned for dozens of activities using MET values, your weight and duration.

Estimate your 1RM from a lift and reps, with a full percentage-of-max training table.

Turn a distance and time into pace per km and per mile, plus projected 5K, 10K, half and marathon times.

Estimate blood alcohol concentration with the Widmark formula and a time-to-sober estimate.

Find your daily protein target range based on body weight and your goal.

Calculate your waist-to-hip ratio and see your health-risk category by sex.

Compute body surface area with the Mosteller and Du Bois formulas side by side.

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