Health

BMI, calories, body fat, heart rate, and related fitness calculators. Educational estimates, not medical advice.

15 calculators

BMI Calculator

Calculate body mass index from height and weight with WHO category.

Estimate daily calorie needs (TDEE) from BMR and activity level.

Estimate body fat percentage with the US Navy circumference method.

Calculate basal metabolic rate with Mifflin–St Jeor and Harris–Benedict.

Compare Hamwi, Devine, Robinson, and Miller ideal-weight formulas.

Convert distance and time into running pace and speed.

Estimate body fat with the DoD / AR 600-9 tape test and age-based max.

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

Find the WHO BMI 18.5–24.9 weight range for your height.

Estimate calories burned from MET, body weight, and duration.

Estimate 1RM from weight and reps using Epley, Brzycki, and Lombardi.

Find training zones from Tanaka HRmax and optional Karvonen resting HR.

Split daily calories into protein, carbs, and fat for cut, maintain, or bulk.

Estimate daily water needs from body weight plus activity.

Calculate waist-to-hip ratio and WHO-style risk category by sex.