67 tools
Health & Fitness
Informational body and activity calculators. They never replace a qualified health professional.
Tools in this category
- Health & FitnessBMI CalculatorBody mass index, its standard category and the weight range for a BMI of 18.5 to 24.9.
- Health & FitnessBMR and Daily Calorie CalculatorBasal metabolic rate by the Mifflin-St Jeor equation, and daily needs at your activity level.
- Health & FitnessRunning Pace CalculatorPace per kilometre and per mile from a distance and a finishing time, with average speed.
- Health & FitnessWater Intake Reference CalculatorA rough daily water reference from body weight and exercise time.
- Health & FitnessCalories Burned CalculatorEnergy used during an activity from its MET intensity, your weight and the duration.
- Health & FitnessHeart Rate Zones CalculatorEstimated maximum heart rate and the 60, 70, 80 and 90 percent training thresholds.
- Health & FitnessBody Fat Calculator (US Navy Method)Estimated body fat percentage, fat mass and lean mass from neck, waist, hip and height measurements.
- Health & FitnessSleep Cycle CalculatorTime in bed needed for a number of sleep cycles, including the time it takes to fall asleep.
- Health & FitnessCalorie Deficit CalculatorTime to reach a target weight at a chosen daily calorie deficit, and the intake it implies.
- Health & FitnessVDOT Calculator (Jack Daniels' Running Formula)A running-fitness score from any race result, with the oxygen cost of your pace and the share of VO₂max you held, using the published Daniels and Gilbert equations.
- Health & FitnessIdeal Body Weight CalculatorDevine and Robinson ideal weights for both sexes, alongside the healthy BMI weight range.
- Health & FitnessRace Finish Time CalculatorFinish time for any distance from a target pace per kilometre, with the average speed.
- Health & FitnessSteps to Distance CalculatorDistance walked from a step count, with stride length estimated from your height.
- Health & FitnessBlood Alcohol Calculator (Widmark Formula Estimate)A rough estimate of blood alcohol concentration after a number of drinks, from your weight and sex, and how long until it reaches zero.
- Health & FitnessHbA1c to Average Glucose Calculator (eAG, % and mmol/mol)Estimated average blood glucose from an HbA1c result, with the value in both % and mmol/mol and the ADA category.
- Health & FitnessOvulation and Fertile Window Calculator (Cycle-Day Method)The expected day of ovulation and the six-day fertile window from your cycle length, with the days left until each.
- Health & FitnessMacronutrient CalculatorDaily grams of protein, carbohydrate and fat from a calorie target and a percentage split.
- Health & FitnessOne Rep Max CalculatorEstimated maximum single lift from a set, by two published formulas, with common training percentages.
- Health & FitnessGlycemic Load Calculator (Meal GL and Average Glycemic Index)Glycemic load, carbohydrate-weighted glycemic index and total carbohydrate for a meal of up to three foods.
- Health & FitnessLDL Cholesterol Calculator (Friedewald Equation)Estimated LDL cholesterol from total cholesterol, HDL and triglycerides in mg/dL or mmol/L, with non-HDL cholesterol and the NCEP band.
- Health & FitnessMean Arterial Pressure Calculator (MAP and Pulse Pressure)Mean arterial pressure and pulse pressure from a blood pressure reading, with the American blood pressure category.
- Health & FitnessPregnancy Weight Gain Calculator (IOM Recommendations)The recommended weight gain for a single pregnancy from your pre-pregnancy BMI, the range for the week you are at, and where your gain so far falls.
- Health & FitnessBarbell Plate Calculator (Which Plates to Load)How many of each plate to put on each side of a barbell to reach a target weight, for kilogram or pound plates, with what is left over if the target cannot be made.
- Health & FitnessCaffeine Half-Life Calculator (How Much Is Still in Your Body?)How much caffeine is left in your body hours after a coffee, and how long until it falls to a level that will not get in the way of sleep.
- Health & FitnessCycling Speed from Power Calculator (Watts to km/h on Hills and Flat)How fast you will ride on a given gradient for the power you can hold, from your weight, rolling resistance and aerodynamics, and how long a climb will take.
- Health & FitnessGrade Adjusted Pace Calculator (Running Uphill and Downhill)The flat-ground pace that costs the same energy as your pace on a slope, so hill runs can be compared with flat ones, from Minetti's measured cost of running.
- Health & FitnessWaist-to-Height Ratio CalculatorWaist measurement divided by height, with the half-height reference value.
- Health & FitnessWilks and DOTS Score Calculator (Powerlifting Coefficients)Your powerlifting total scaled by bodyweight, as a Wilks score and as a DOTS score, so lifters of different sizes can be compared.
- Health & FitnessMid-Parental Height Calculator (How Tall Will My Child Be?)A prediction of your child's adult height from both parents' heights, using Tanner's mid-parental formula, with a likely range.
- Health & FitnessCycling Power CalculatorThe watts needed to hold a speed, split between air resistance, rolling resistance and the gradient.
- Health & FitnesseGFR Calculator (CKD-EPI 2021 Creatinine Equation)Estimated glomerular filtration rate from serum creatinine, age and sex by the 2021 race-free CKD-EPI equation, with its KDIGO category.
- Health & FitnessHOMA-IR Calculator (Insulin Resistance, HOMA-%B and QUICKI)Insulin resistance by HOMA-IR, beta-cell function by HOMA-%B and the QUICKI sensitivity index from fasting glucose and fasting insulin.
- Health & FitnessSunscreen Amount Calculator (How Much for Your Body?)The amount of sunscreen to cover the skin you leave exposed, using the 2 mg per cm² of the SPF test, plus how many applications a bottle gives.
- Health & FitnessTreadmill Oxygen Cost Calculator (ACSM Walking and Running Equations)Oxygen cost in mL/kg/min, METs and calories for walking or running on a treadmill at a given speed and incline, from the ACSM metabolic equations.
- Health & FitnessKarvonen Target Heart Rate CalculatorTraining heart rate zone from the heart rate reserve method, using your resting pulse.
- Health & FitnessAthlete Carbohydrate Needs Calculator (Grams per Day by Training Load)A daily carbohydrate range in grams from your body weight and how much you train, plus the carbohydrate-loading amount before a long event.
- Health & FitnessCreatinine Clearance Calculator (Cockcroft–Gault)Estimated creatinine clearance in mL/min from age, weight, sex and serum creatinine, the equation behind many drug-dosing tables.
- Health & FitnessCritical Power Calculator (CP and W′ from Two Efforts)Your critical power and W′ from two maximal efforts of different lengths, with the time you can hold a chosen power and predicted 5- and 20-minute powers.
- Health & FitnessFFMI Calculator (Fat-Free Mass Index, Normalised)Fat-free mass index and its height-normalised version from your weight, height and body fat percentage, with lean and fat mass.
- Health & FitnessRace Time Predictor (Riegel Formula)Predicted finish time and pace for a half marathon, marathon or any distance from a recent race result, using Riegel's formula.
- Health & FitnessRucking Calories Calculator (Pandolf Equation)Energy you spend walking with a backpack or weighted vest, from body weight, load, speed, slope and terrain, by the Pandolf equation used by the US Army.
- Health & FitnessSkinfold Body Fat Calculator (Jackson–Pollock 3-Site, Siri Equation)Body fat percentage, body density and fat and lean mass from three skinfold caliper readings, by the Jackson–Pollock 3-site method.
- Health & FitnessSleep Efficiency Calculator (Time Asleep ÷ Time in Bed)Sleep efficiency as a percentage, and total sleep time, from your time in bed, how long you took to fall asleep and how long you were awake.
- Health & FitnessWaist to Hip Ratio CalculatorWaist-to-hip ratio, with the waist measurement that would meet the commonly cited thresholds.
- Health & FitnessAcute:Chronic Workload Ratio Calculator (ACWR for Training Load)Your acute:chronic workload ratio from four weeks of training load, with its zone, the largest sensible load for next week and the week-on-week change.
- Health & FitnessAerobic Decoupling Calculator (Pa:Hr Cardiac Drift)How much your pace-to-heart-rate efficiency fell from the first half of a steady run or ride to the second, from the average speed or power and heart rate of each half.
- Health & FitnessSWOLF and Stroke Index Calculator (Swimming Efficiency)SWOLF, distance per stroke, stroke rate and Costill's stroke index from your time and stroke count for one pool length.
- Health & FitnessVO2max Calculator from Heart Rate (Uth Method)Estimated maximal oxygen uptake from the ratio between your maximum and resting heart rate, with no running or cycling test.
- Health & FitnessABSI and Body Roundness Index Calculator (Waist-Based Risk Indices)A Body Shape Index and Body Roundness Index from waist, height and weight, two measures that use the waist to say more than BMI does.
- Health & FitnessBody Surface Area CalculatorBody surface area by the Mosteller, Du Bois and Haycock formulas, with the BMI alongside.
- Health & FitnessRelative Fat Mass (RFM) CalculatorEstimated body fat percentage from height and waist circumference, by the RFM equation, with the fat and fat-free mass for your weight.
- Health & FitnessSwimming Pace CalculatorPace per 100 metres, speed, number of lengths and the average time per length.
- Health & FitnessCooper Test VO₂ Max CalculatorEstimated VO₂ max from the distance covered in a 12-minute run, with the MET equivalent.
- Health & FitnessLean Body Mass Calculator (Boer Formula)Lean mass, fat mass and implied body fat percentage from height, weight and sex.
- Health & FitnessHiking Time Calculator (Naismith's Rule)How long a hill walk will take from its distance and total climb, using Naismith's rule, with your own pace if you know it.
- Health & FitnessWBGT Calculator (Wet-Bulb Globe Temperature)Heat stress index from the natural wet-bulb, black globe and air temperatures, outdoors or indoors, with the US Army heat category flag.
- Health & FitnessBody Adiposity Index (BAI) CalculatorEstimated body fat percentage from hip circumference and height alone, and the fat and fat-free mass it implies for your weight.
- Health & FitnessTotal Body Water Calculator (Watson Formula)Litres of water in your body from sex, age, height and weight, by the Watson equations, and the fat-free and fat mass that implies.
- Health & FitnessTRIMP Calculator (Banister Training Impulse)A single number for how hard a session was, from its length and your average heart rate, using the Banister exponential weighting of the heart rate reserve.
- Health & FitnessTSS Calculator (Training Stress Score for Cycling)Training Stress Score and intensity factor of a ride from its duration, normalized power and your FTP, with the equivalent minutes at threshold.
- Health & FitnessCritical Swim Speed (CSS) CalculatorYour critical swim speed and the matching pace per 100 m from just a 400 m and a 200 m time trial, plus the anaerobic distance capacity.
- Health & FitnessFTP and Cycling Power Zones CalculatorFunctional threshold power from a 20-minute test, watts per kilogram, and the training zones built on it.
- Health & FitnessRowing Pace and Watts Calculator (Concept2 Ergometer)Convert a rowing split per 500 m into watts, speed and a 2000 m time, or turn a power in watts back into the split it corresponds to.
- Health & FitnessStride Length Calculator (Running Step Length from Speed and Cadence)Step length, stride length and steps per kilometre or mile from your running or walking speed and your cadence.
- Health & FitnessSweat Rate CalculatorHow much fluid you lose per hour of exercise, from your weight before and after, what you drank and the duration.
- Health & FitnessVAM Calculator (Climbing Speed and Estimated W/kg)Average climbing speed in vertical metres per hour, the gradient, and a rough estimate of the watts per kilogram that it takes.
- Health & FitnessRockport Walk Test Calculator (VO₂max)Estimated aerobic fitness (VO₂max) from the Rockport one-mile walk test: walk 1609 m as fast as you can and note the time and your heart rate at the finish.