Health Calculators

Estimate adult body mass index from metric height and weight, then map the result to a standard adult screening category.

Estimate resting daily energy expenditure with the Mifflin–St Jeor equation.

Estimate total daily energy expenditure from BMR and a selected activity factor.

Model a daily calorie adjustment from maintenance energy and a weekly weight-change target.

Estimate body-fat percentage with the circumference-based US Navy method.

Compare four historical height-based weight-reference equations.

Estimate daily fluid volume from body weight, activity time, and climate.

Estimate a broad daily protein range by body weight and activity goal.

Estimate a pregnancy due date from the first day of the last menstrual period and usual cycle length.

Estimate ovulation, a fertile window, and the next period from cycle assumptions.

Split daily calories into protein, carbohydrate, and fat gram targets from percentage shares.

Estimate Karvonen training zones from age and resting heart rate.

Calculate pace per kilometer and average speed from distance and finish time.

Estimate one-repetition maximum using Epley and Brzycki formulas.

Calculate waist-to-hip circumference ratio.

Estimate lean body mass and fat mass from weight and body-fat percentage.