Health calculators

The standard formulas, cited — with their limits stated.

BMI calculator kg/cm or lbs/ft, WHO categories Calorie calculator (TDEE) Maintenance, cut, and gain targets BMR calculator Calories burned at complete rest Ideal weight Devine formula + the healthy range Body fat (Navy) Tape-measure estimate, honest ±3% Water intake Daily target from weight and training Due date Naegele’s rule, week and trimester Pace calculator Min/km, min/mile + race projections One rep max Epley & Brzycki + training percentages Macro calculator Protein, carbs, fat from your calories Ovulation Fertile window from your last period
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Every health calculator here follows the same rules: results update live as you type, the formula is shown with a worked example, and the math runs entirely in your browser — nothing you enter is uploaded anywhere. More health calculators are added regularly; each one is unit-tested against published reference values before it ships.