Health Calculators
BMI, calories & body metrics
BMI Calculator
Body Mass Index in metric or imperial units, with WHO category and healthy weight range for your height.
BMR Calculator
Basal Metabolic Rate via the Mifflin-St Jeor equation — the calories your body burns at complete rest.
TDEE Calculator
Total Daily Energy Expenditure: your full-day calorie burn based on BMR and activity level.
Calorie Calculator
Daily calorie targets for losing, maintaining or gaining weight based on your goal pace.
Body Fat Calculator
US Navy method body-fat percentage from neck, waist and hip measurements, with category rating.
Ideal Weight Calculator
Healthy weight ranges from four classic formulas plus the normal-BMI band for your height.
Macro Calculator
Protein, carb and fat gram targets matched to your calories and preferred macro split.
Water Intake Calculator
Personalized daily hydration target from body weight plus exercise and climate adjustments.
Calories Burned Calculator
Estimate calories burned walking, running, cycling or hiking using MET values for any duration.
One Rep Max Calculator
Estimate your 1RM from a rep max set, plus percentage-based training loads.
About health calculations
Health calculators for BMI, basal metabolic rate, daily calorie needs, body fat, ideal weight, macros and hydration. Evidence-based formulas with clear explanations of what each result means.