Health calculators
Body mass index, calorie use, water, sleep, walking, and the kidney filtration rate. These are guides taken from published formulas, not a medical opinion.
Body mass index and a weight range from the WHO boundaries.
HealthIdeal weightFour formulas: Devine, Robinson, Miller, and Hamwi.
HealthBasal metabolismHow many calories you use at rest, by the Mifflin–St Jeor formula.
HealthDaily caloriesIntake for the day, the goal, and a rough split of protein, fat, and carbs.
HealthWaterAbout 30 mL per kilogram of weight, plus extra for the workout.
HealthProteinGrams of protein per day from weight and activity level.
HealthSleepWake time or bedtime from cycles of about 90 minutes.
HealthHeart rateZones from an estimate of maximum heart rate, or from the Karvonen formula.
HealthGFReGFR from creatinine, the CKD-EPI 2021 equation.
HealthDue dateFrom the last period, from conception, or from the age on an ultrasound.
HealthAlcohol calculatorAn estimate of alcohol concentration by the Widmark formula.
HealthOvulationThe ovulation day and the fertile window from the cycle length.
HealthWalkingSpeed, pace, and a calorie guide for a walk.
HealthCalories on a bicycleSpeed and energy use of a bicycle ride.
HealthCalories from macrosCalories from grams of protein, fat, and carbohydrate.
HealthCalories in a servingRecalculates the calories on the label for the actual weight.
HealthCalorie densityHow many kilocalories there are per gram of the food.
HealthProtein per 100 kcalCompares foods by protein per 100 kilocalories.
HealthHeart-rate recoveryHow far the heart rate fell in the minute after exercise.
HealthStride lengthA stride estimate for walking and running, from height.
HealthWeight on other planetsHow much the same mass would weigh in a different gravity.
HealthFrame sizeA frame-size guide from inseam.
HealthBicycle gearsSpeed and rollout from the sprockets and cadence.
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