Health & Body calculators
BMI, body fat, ideal weight, BMR, blood alcohol, sleep and health metrics.
65 free tools
Most used
A1C CalculatorConvert HbA1c to estimated average glucose (eAG) and backAdult Height Percentile CalculatorSee how your height compares with US adults of your sex and ageBlood Alcohol (BAC) CalculatorEstimate your blood alcohol content and how long until it reaches zeroBlood Pressure CalculatorCheck which blood pressure category your reading falls inBMI CalculatorFind your body mass index, weight category and healthy weight rangeBMR CalculatorFind the calories your body burns at rest with three proven formulasBody Fat CalculatorEstimate body fat percentage with a tape measure (US Navy method)Body Shape CalculatorFind your body shape from bust, waist and hip measurementsDesk Height CalculatorErgonomic desk, chair and monitor heights for sitting and standingeGFR CalculatorEstimate kidney function from creatinine with the CKD-EPI 2021 equationGlasses to Contacts Prescription ConverterConvert a glasses prescription to contact lens power at the eyeHeart Age CalculatorFind your heart age and 10-year cardiovascular risk (Framingham)Ideal Weight CalculatorHow much should you weigh? Four clinical formulas plus a healthy BMI rangeLean Body Mass CalculatorEstimate your fat-free mass from height and weight with three formulasLife Expectancy CalculatorEstimate how long you might live and how lifestyle changes the oddsNap CalculatorPick the best nap length and wake time to avoid waking up groggyPeriod CalculatorPredict your next periods, ovulation and fertile daysReading Glasses Strength CalculatorEstimate the reading glasses strength you need from age or near pointResting Heart Rate Chart by AgeRate your resting pulse against healthy people your age and sexSkinfold Body Fat CalculatorTurn caliper skinfold readings into body fat % with proven equationsSleep CalculatorFind the best time to go to bed or wake up using 90-minute sleep cyclesStandard Drinks CalculatorCount the standard drinks in any bottle, can or glassWaist-to-Hip Ratio CalculatorFind your waist-to-hip ratio and what it says about your health risk
More health & body tools
20-20-20 Eye Break TimerEvery 20 minutes, look 20 feet away for 20 seconds — we’ll remind youAdult Weight Percentile CalculatorSee how your weight compares with US adults of your sex and ageAlcohol Units CalculatorCount UK alcohol units and US standard drinks in any drinkArmy Body Fat CalculatorCheck the new Army waist-to-height standard and estimate your body fatASCVD Risk CalculatorEstimate your 10-year risk of heart attack or strokeBlood Donation Eligibility Date CalculatorFind the next date you can give whole blood, Power Red, platelets or plasmaBlood Sugar ConverterConvert glucose between mg/dL and mmol/L and see what it meansBody Roundness Index CalculatorMeasure your body roundness (BRI) from just your waist and heightBody Surface Area CalculatorCalculate BSA in m² with Mosteller, DuBois, Haycock and moreBox Breathing TimerFollow an animated guide for box, 4-7-8 and coherent breathingCaffeine CalculatorAdd up your daily caffeine and see how much is left at bedtimeCholesterol Ratio CalculatorTurn your lipid panel into total/HDL, LDL/HDL and TG/HDL ratiosChronotype CalculatorFind your body-clock type from when you sleep on work days and free daysCreatinine Clearance CalculatorEstimate CrCl with Cockcroft-Gault for kidney function and drug dosingFFMI CalculatorMeasure muscularity with fat-free mass index and normalized FFMIIV Drip Rate CalculatorWork out IV flow in mL/hr and drops per minute in secondsLDL Cholesterol CalculatorCalculate LDL from total cholesterol, HDL and triglyceridesMean Arterial Pressure CalculatorTurn a blood pressure reading into MAP and pulse pressure instantlyMeditation TimerA calm, simple meditation timer with warm-up, interval bells and ambient soundNoise Exposure CalculatorWork out your daily noise dose and safe listening time (NIOSH & OSHA)QTc CalculatorCorrect the QT interval for heart rate with four standard formulasRadiation Dose CalculatorAdd up your yearly radiation dose from scans, flights and backgroundSleep Debt CalculatorSee how much sleep you owe this week and how long to catch upSleep Efficiency CalculatorSee what share of your time in bed you actually spend asleepSunburn Time CalculatorEstimate how many minutes until you burn — with and without sunscreenTotal Body Water CalculatorEstimate how many litres of water your body holds (Watson formula)Visual Acuity ConverterConvert 20/x, 6/x, decimal and logMAR vision scores instantlyVitamin D Sun Exposure CalculatorEstimate how many minutes of sun make your target vitamin D — before you burnWaist-to-Height Ratio CalculatorKeep your waist to less than half your height — check yours in secondsABSI Calculator (A Body Shape Index)Gauge abdominal-fat risk beyond BMI with your ABSI and age-sex z-scoreAmputee BMI CalculatorCorrect BMI and weight for missing limbs using standard segment percentagesAnion Gap CalculatorSerum anion gap with albumin correction and delta ratioBlood Volume CalculatorEstimate how much blood is in your body with Nadler’s formulaBody Adiposity Index CalculatorEstimate body fat percentage from just your hip measurement and heightCorrected Calcium CalculatorAdjust total calcium for low albumin in mg/dL or mmol/LGrip Strength Norms CalculatorSee how your hand grip compares with norms for your age and sexMaintenance Fluid CalculatorHolliday-Segar daily fluids and the 4-2-1 hourly rate by weightMedication Days Supply CalculatorFind how many days a prescription lasts and when to refill itPack Year CalculatorMeasure smoking history in pack-years and check screening eligibilityPeak Flow CalculatorPredicted peak flow for your age and height, plus your asthma zonePonderal Index CalculatorRohrer’s ponderal index for adults and newborns — weight scaled by height cubedRelative Fat Mass CalculatorEstimate body fat % from just your height and waist