🫀 Human Body & Health Calculators
BMI, metabolism, heart, lungs, hydration and dosing. Browse 28 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)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.
More calculator categories
🚀 Mechanics & Motion🔥 Thermodynamics & Fluids⚡ Electricity & Magnetism🌈 Waves, Sound & Optics🪐 Modern Physics & Astronomy⚗️ General Chemistry🧪 Solutions, Acids & Kinetics🧬 Genetics & Molecular Biology🌿 Ecology & Evolution∑ Algebra & Calculus📐 Geometry & Trigonometry📊 Statistics & Probability🌍 Earth & Environmental Science