Health calculators
Track your body with TudoCalc's health calculators: BMI, metabolic rate, ideal weight, body fat, daily water and more. They're practical estimates based on recognized formulas — not a substitute for medical advice.
BMI
Calculate your Body Mass Index (BMI) and see the WHO classification.
BMR & calories
Calculate your basal metabolic rate (BMR) and how many calories you burn per day (TDEE).
Ideal weight
Find your healthy weight range by height and an ideal weight estimate.
Pregnancy (due date)
Estimate the due date and gestational age from the last menstrual period.
Fertile window
Estimate your fertile window and ovulation day from the last period and cycle length.
Body fat %
Estimate your body fat percentage with the US Navy method using tape measurements.
Daily water
Find out how many liters of water to drink per day based on your weight and activity.
Sleep (best time)
Find the best time to sleep or wake up, based on 90-minute sleep cycles.
Lean body mass
Estimate your lean body mass and fat mass with the Boer formula (weight, height, sex).
Medication dosage
Calculate the total dose from the recommended dose per kg and the patient's weight.
Blood alcohol (BAC)
Estimate your blood alcohol content with the Widmark formula, in g/L and %. An estimate only — never drink and drive.
Calories burned
Estimate how many calories you burn in an activity from your weight, exercise type and time.
Waist-to-hip ratio
Calculate your waist-to-hip ratio and see the cardiovascular risk band per the WHO.
Calorie deficit
Find out how many calories to eat per day to lose (or gain) weight at the pace you choose.
Waist-to-height ratio
Divide waist by height to assess health risk — the simple "keep your waist under half your height" rule.
Body surface area
Calculate body surface area with the Mosteller formula, used in medication dosing.