🫀 Human Body & Health Calculators
BMI, metabolism, heart, lungs, hydration and dosing. Browse 63 free human body & health calculators, each with the formula, a worked example and an interactive chart.
BMI CalculatorCompute body mass index and weight category.BMR Calculator (Mifflin-St Jeor Equation)Estimate basal metabolic rate and daily calorie needs.Weight Change Calorie CalculatorEstimate time to lose or gain weight with a daily calorie change.Body Surface Area CalculatorCompute body surface area (Mosteller).Ideal Body Weight CalculatorEstimate ideal body weight with the Devine formula.Body Fat Percentage Calculator (Navy Method)Estimate body fat percentage from waist and neck measurements.Waist-to-Hip Ratio CalculatorCompute waist-to-hip ratio and health risk.Heart Rate Zones CalculatorFind maximum heart rate and training zones.Cardiac Output CalculatorCompute cardiac output from heart rate and stroke volume.Mean Arterial Pressure CalculatorFind mean arterial pressure and pulse pressure.Minute Ventilation CalculatorCompute minute ventilation from breathing rate and tidal volume.Predicted Lung Capacity CalculatorEstimate predicted forced vital capacity.Daily Water Intake CalculatorEstimate daily water needs from weight and activity.Sweat Rate CalculatorCompute sweat rate during exercise.Weight-Based Dose CalculatorCompute a dose from body weight (educational use only).IV Drip Rate CalculatorCompute drops per minute for an infusion.Drug Elimination CalculatorFind drug amount remaining after time using half-life.Blood Alcohol Content (Widmark) CalculatorEstimate blood alcohol content (educational estimate).Sleep Cycle CalculatorFind wake times that match 90-minute sleep cycles.Reaction Time Distance CalculatorFind distance travelled during a reaction delay.VO₂ Max Calculator (Cooper Test)Estimate VO₂ max from a 12-minute run distance.Calories Burned Running CalculatorEstimate calories burned from weight and distance.Calories Burned by Activity (MET) CalculatorCompute energy burned from activity intensity.Daily Protein CalculatorEstimate daily protein needs.Macronutrient CalculatorConvert a calorie target to grams of carbs, protein and fat.Pregnancy Gestation CalculatorEstimate weeks pregnant and days to due date (Naegele rule).Visual Acuity ConverterConvert Snellen acuity to decimal and logMAR.Safe Noise Exposure Time CalculatorFind the safe daily exposure time at a noise level.Katch-McArdle BMR CalculatorEstimate basal metabolic rate from lean body mass, which is more accurate than weight alone for muscular people.Total Daily Energy Expenditure CalculatorEstimate daily calorie needs by multiplying your basal metabolic rate by an activity factor.Ponderal Index CalculatorCompare body mass with height cubed, a measure of leanness used for children and tall people.Waist-to-Height Ratio CalculatorAssess central fat and health risk by comparing waist circumference with height.Body Adiposity Index CalculatorEstimate body fat percentage from hip circumference and height only.Pulse Pressure CalculatorFind the difference between systolic and diastolic blood pressure.Rate Pressure Product CalculatorEstimate heart workload from heart rate and systolic blood pressure.Ejection Fraction CalculatorFind the percentage of blood the heart pumps out with each beat from its end-diastolic and end-systolic volumes.Kidney Function eGFR (MDRD) CalculatorEstimate kidney filtration rate from serum creatinine, age and sex using the MDRD equation.Creatinine Clearance (Cockcroft-Gault) CalculatorEstimate creatinine clearance from age, weight, serum creatinine and sex, used for drug dosing.Anion Gap CalculatorCalculate the anion gap from serum sodium, chloride and bicarbonate levels.Albumin Corrected Calcium CalculatorCorrect a measured blood calcium level for low or high serum albumin.Arterial Oxygen Content CalculatorFind the total oxygen carried in arterial blood from haemoglobin, saturation and oxygen pressure.Alveolar Oxygen Pressure CalculatorEstimate the oxygen pressure in the lungs air sacs using the alveolar gas equation.Oxygen Delivery CalculatorFind how much oxygen the heart delivers to the body per minute.Urine Output per Kilogram CalculatorCalculate urine output rate in mL per kg per hour, a common measure of kidney function in hospital.Maintenance IV Fluid Rate (4-2-1 Rule) CalculatorEstimate hourly maintenance fluid for a child or adult using the 4-2-1 rule.Blood Glucose Unit ConverterConvert blood glucose between mmol/L and mg/dL.LDL Cholesterol (Friedewald) CalculatorEstimate LDL cholesterol from total cholesterol, HDL and triglycerides using the Friedewald equation.Non-HDL Cholesterol CalculatorFind non-HDL cholesterol, total cholesterol minus HDL cholesterol.Hematocrit Estimate CalculatorEstimate the packed cell volume (hematocrit) from haemoglobin concentration.Free Water Deficit CalculatorEstimate the free water deficit in a dehydrated patient from serum sodium and body weight.Fractional Excretion of Sodium CalculatorFind the fraction of filtered sodium the kidneys excrete, to help tell causes of kidney injury.Corrected QT Interval (Bazett) CalculatorCorrect the QT interval on an ECG for heart rate using Bazett formula.Daily Fibre Target CalculatorEstimate a daily fibre target based on energy intake (14 g per 1000 kcal).Time to Sunburn CalculatorEstimate how many minutes you can stay in the sun before skin starts to burn, from UV index and sunscreen SPF.Pediatric Dose (Young Rule) CalculatorEstimate a child dose from the adult dose and the child age using Young rule.Daily Free Sugar Limit CalculatorFind the daily limit for free sugars from energy intake, using the WHO guideline of 10 percent and a stricter 5 percent target.Salt to Sodium ConverterConvert daily salt intake into sodium, which is the amount a food label lists.UK Alcohol Units CalculatorCount the UK alcohol units in a drink from its volume and alcohol by volume.Steps to Distance CalculatorEstimate the distance covered from step count and height, using a typical stride length.Karvonen Target Heart Rate CalculatorFind a target heart rate for training from age, resting heart rate and desired intensity.Insulin to Carbohydrate Ratio (500 Rule) CalculatorEstimate how many grams of carbohydrate one unit of insulin covers, using the 500 rule.Blood Volume Estimate CalculatorEstimate total blood volume from body weight and sex.Predicted Body Weight and Tidal Volume CalculatorFind predicted body weight from height and sex and the tidal volume at 6 mL per kg for ventilation.
About Human Body & Health calculators
BMI, metabolism, heart, lungs, hydration and dosing. CalcDepo has 63 free human body & health calculators. Each one shows the formula, the variables and their units, a worked example and a chart of how the result changes, so you can check homework, plan a lab or understand the idea behind the numbers.
Popular calculators here include BMI, BMR, Weight Change Calorie, Body Surface Area, Ideal Body Weight, Body Fat Percentage. Common searches in this category include “am i overweight”, “mifflin st jeor calculator”, “how long to lose weight”, “bsa for dosing”.
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