Health Calculators
BMI, calories, ideal weight and other health metric tools.
BMI and Calorie Calculator
Calculate BMI and daily calorie needs.
Body Fat % Calculator — US Navy Circumference & BMI Formula Methods
Enter height, weight, age, and circumferences to estimate body-fat percentage using the US Navy circumference method or the Deurenberg BMI formula method.
Macronutrient Calculator — Protein, Carbs & Fat Split
From TDEE and goal (maintain / cut / bulk), get daily grams of protein, carbs and fat.
Target Heart Rate Calculator — Karvonen Heart Rate Reserve
From age and resting heart rate, get max HR, heart rate reserve, and target HR range by intensity.
Daily Water Intake Calculator — NASEM Baseline
From sex, weight, exercise and climate, estimate daily water and exercise top-up.
Lean Body Mass Calculator — Boer / Hume formulas
From sex, height and weight, estimate lean body mass, fat mass and body-fat percentage with the Boer or Hume formula.
Sleep Cycle Calculator — Best Wake Times
Enter bedtime to get the best wake times across 90-minute sleep cycles, avoiding grogginess.
BMI Calculator
Enter height and weight to compute BMI and get the weight category and health advice per WHO / Asian standards.
Ideal Weight (by Target Body Fat) Calculator
Enter current weight, current body-fat percentage, and target body-fat percentage to estimate ideal weight via the lean-mass method.
Calorie Deficit (Calorie Deficit) Calculator
Enter total daily energy expenditure (TDEE) and target weekly weight-loss rate to compute the daily calorie intake and corresponding deficit.
Daily Water Intake Calculator
From weight, activity and climate, estimate daily water goal (litres).
Target Weight (by BMI) Calculator
Enter height and a target BMI range to compute the corresponding target weight range.