Health & Fitness Calculators
Calories, body metrics, hydration, protein, and training numbers — clear estimates for general guidance, never medical advice.
8 free calculators · updated June 2026
BMR Calculator
Calories your body burns at complete rest — the Mifflin-St Jeor basal metabolic rate.
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TDEE Calculator
Maintenance calories — your BMR scaled by activity, the number to plan around.
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Body Fat Percentage Calculator
Estimate body fat from a tape measure — the US Navy circumference method, with neutral reference bands.
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Ideal Weight Calculator
A reference weight range from four classic formulas — a spread, never a single target.
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Water Intake Calculator
A daily water target from your weight, activity, and climate — in liters, cups, and ounces.
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Protein Intake Calculator
Daily protein in grams from your weight and goal — with the goal’s evidence range.
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One Rep Max Calculator
Estimate your 1RM from reps — Epley and Brzycki, plus a %-of-1RM table for programming.
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Pace Calculator
Running pace per km and per mile from distance and time — plus speed in km/h and mph.
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