Fitness & health

Body Mass Index with metric / imperial inputs and WHO category bands.

Daily calorie needs from BMR and activity level, with weight-goal targets.

US Navy circumference method — body fat % from neck, waist and hip.

Basal metabolic rate via Mifflin-St Jeor, Harris-Benedict and Katch-McArdle.

Estimate lean body mass with Boer, James and Hume formulas.

Healthy weight range from height via Robinson, Miller, Devine and Hamwi formulas.

Healthy weight range for your height using BMI 18.5–24.9 and clinical references.

AR 600-9 body fat % and pass/fail check from neck, waist and hip measurements.

Karvonen and percentage-of-max heart rate zones for cardio training.

1RM via Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner and Wathan formulas.

Running pace per km / mile and finish-time predictor for common race distances.

Energy expenditure for 30+ activities via the MET method (kcal = MET × kg × hours).