100 tools

Health, fitness and nutrition

100 free health, fitness and nutrition tools, all running in your browser with no sign-up.

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BMI calculatorWork out your body mass index from weight in kg and height in cm, see your WHO category and the healthy weight range for your height.
BMI calculator in pounds, feet and inchesCalculate BMI from weight in pounds and height in feet and inches, using exact conversion to kilograms and meters.
BMI Prime calculatorFind your BMI Prime, the ratio of your BMI to the upper healthy limit of 25, and see how far above or below that limit you are.
Target weight for a BMI calculatorFind the weight that gives the BMI you want at your height, and how many kilograms you need to lose or gain to get there.
Healthy weight range calculatorSee the lowest and highest healthy weight for your height, based on the WHO healthy BMI band of 18.5 to 24.9.
Ideal weight calculatorCalculate your ideal body weight from height and sex with four medical formulas: Devine, Robinson, Miller and Hamwi, side by side.
Broca and Lorentz ideal weight calculatorWork out ideal weight with the classic Broca formula (height minus 100) and the Lorentz formula, which adjusts for sex.
BMR calculator (Mifflin-St Jeor)Calculate your basal metabolic rate with the Mifflin-St Jeor equation: the calories your body burns each day at complete rest.
Harris-Benedict BMR calculatorCalculate basal metabolic rate with the Harris-Benedict equation, in the original 1919 version or the 1984 Roza and Shizgal revision.
Katch-McArdle BMR calculatorCalculate BMR with the Katch-McArdle equation, which uses lean body mass. Useful if you know your body fat percentage.
TDEE calculatorEstimate your total daily energy expenditure from BMR and activity level, the calories you need each day to keep your weight steady.
Body fat calculator (US Navy method)Estimate your body fat percentage with just a tape measure using the US Navy method: height, neck and waist, plus hips for women.
Body fat from BMI calculatorEstimate body fat percentage from BMI, age and sex using the Deurenberg equation, with no tape measure needed.
Lean body mass calculatorCalculate your lean body mass with three known equations, Boer, James and Hume, plus the body fat percentage each one implies.
FFMI calculator (fat-free mass index)Calculate your fat-free mass index and its height-adjusted value, a better gauge of muscle than BMI for people who train.
Waist-to-hip ratio calculatorWork out your waist-to-hip ratio and compare it with the WHO cut-offs of 0.90 for men and 0.85 for women to gauge belly fat.
Waist-to-height ratio calculatorWork out your waist-to-height ratio against the rule of keeping your waist under half your height, with the UK NICE bands.
Body surface area calculatorCalculate body surface area in square meters with the Mosteller, Du Bois, Haycock and Gehan and George formulas used in dosing.
Body roundness index (BRI) calculatorCalculate your body roundness index from waist and height, a newer measure of belly fat that links body shape to health risk.
Body adiposity index (BAI) calculatorEstimate body fat percentage with the body adiposity index from hip circumference and height only, with no weight or scale needed.
Calorie deficit calculator with target dateWork out your daily calorie deficit, expected weekly weight loss and the date you reach your goal weight from maintenance and intake.
Calories to reach a goal weight in set weeksSet current weight, goal weight and number of weeks to get the daily calorie target, the deficit needed and the weekly loss rate.
Macro calculator: protein, carbs and fatSplit your daily calories into grams of protein, carbohydrate and fat using the percentages you choose, with the calories of each.
Daily protein intake calculatorFind how many grams of protein you need a day from your weight and situation: inactive adult, older adult or regular exerciser, split by meal.
Daily water intake calculatorSee the recommended daily water intake by sex, pregnancy and breastfeeding from EFSA or NASEM reference values, and how many cups to drink.
Daily fiber intake calculatorCalculate how many grams of fiber you need a day from your calories (14 g per 1000 kcal) and from age and sex, plus how far you are from it.
Sugar grams to teaspoons converterTurn the grams of sugar on a food label into teaspoons, and see the calories and the share of the WHO daily sugar limit.
Daily sugar limit calculatorCalculate your daily free sugar limit in grams and teaspoons from your calories using WHO advice, plus the American Heart Association added sugar cap.
Keto macro calculatorWork out keto fat and protein grams from your calories, net carb limit and protein per kg, with each macro as a share of calories.
Intermittent fasting window calculatorEnter your last meal time and a fasting plan such as 16:8 or 18:6 to see when to break the fast and when the eating window closes.
Ramadan suhoor and iftar calorie splitSplit your daily Ramadan calories between iftar, suhoor and a snack with the shares you pick, and see fasting hours and the eating window.
Ramadan water plan from iftar to suhoorSpread the water you want to drink in Ramadan across the hours from maghrib to fajr: number of cups and how often to drink one.
Daily caffeine intake calculatorAdd up caffeine from coffee, tea, cola, energy drinks and chocolate, and compare it with the 400 mg daily safe level, or 200 mg in pregnancy.
Caffeine half-life calculatorEstimate how much caffeine is still in your body after a number of hours using its half-life, and when it drops below 50 mg before sleep.
Meal calories from protein, carbs and fatEnter the grams of protein, carbohydrate, fat and alcohol in a meal to get its total calories and the share from each.
Net carbs calculatorWork out net carbs from a food label by subtracting fiber and sugar alcohols, allowing for the difference between US and EU labels.
Portion calories from a per 100 g labelTurn the per 100 g values on a food label into calories, protein, carbs and fat for the portion you actually eat, in grams.
Sodium to salt converterConvert milligrams of sodium to grams of salt, or back, with the food label factor 2.5, and see the share of the WHO daily limit.
Carbohydrate intake calculator for athletesCalculate your daily carbohydrate need in grams from body weight and training load using sports nutrition guidelines, with matching calories.
Glycemic load calculatorCalculate the glycemic load of a food portion from its glycemic index and grams of carbohydrate, and see whether it is low, medium or high.
Running pace calculatorEnter a distance and finish time to get your running pace per kilometer and per mile, plus your speed in km/h and mph.
Pace to speed converterConvert a running pace in minutes per km or per mile into speed in km/h, mph and meters per second.
Speed to pace converterTurn a speed in km/h or mph into pace per km and per mile, with finish times for 5K, 10K, half marathon and marathon.
Race time predictor (Riegel)Predict your 5K, 10K, half marathon or marathon time from a recent race result using the Riegel formula.
Race split calculatorEnter a race distance and goal time to get a table of the cumulative time at every kilometer or mile at an even pace.
One rep max (1RM) calculatorEstimate your one rep max (1RM) from a weight and the reps you did with it, using the Epley and Brzycki formulas and their average.
Weight for reps calculator (rep max chart)From your one rep max, find the weight to use for a target number of reps, with a chart from 1 to 12 reps and percentages.
Heart rate zones calculator (Karvonen)Work out your five training heart rate zones with the Karvonen method from your age and resting heart rate, including the fat burn zone.
Max heart rate calculatorEstimate your maximum heart rate from your age with the Tanaka, Fox (220 − age) and Gellish formulas, plus Gulati for women.
Target heart rate calculatorCalculate your target heart rate range for exercise between two intensities you choose, by the Karvonen method or percent of max.
Calories burned calculator (MET)Estimate the calories you burn walking, running, swimming and more from your weight, activity time and its MET value.
Treadmill calories calculator with inclineEstimate treadmill calories from speed, incline, body weight and time using the ACSM walking and running equations.
Steps to distance converterConvert your step count into distance in kilometers, miles and meters based on your step length, such as the distance of 10,000 steps.
Distance to steps converterFind how many steps it takes to cover a distance in kilometers or miles based on your step length, such as steps in one kilometer.
VO2 max calculator (Cooper 12 minute test)Estimate your VO2 max, the maximum oxygen uptake, from the distance you run in 12 minutes using the Cooper test.
Rockport walk test calculator (VO2 max)Estimate VO2 max from the Rockport one mile walk test using your time, finishing heart rate, age, weight and sex.
VO2 max from resting heart rate calculatorEstimate VO2 max without any exercise test from the ratio of max heart rate to resting heart rate, by the Uth method.
Swimming pace calculator per 100 mEnter a swim distance and time to get your pace per 100 meters and per 100 yards, plus speed in m/s and km/h.
Wilks score calculatorCalculate your Wilks score to compare strength across body weights, from body weight and your squat, bench and deadlift total.
DOTS score calculatorCalculate your DOTS powerlifting score from body weight and total to compare relative strength between lifters.
Due date calculatorEstimate your due date from the first day of your last period with Naegele's rule, adjusted for cycle length, plus trimester start dates.
Pregnancy week calculatorFind how many weeks pregnant you are today or on any date, from your last period or your due date, with the trimester and days left.
Conception date calculatorEstimate the day you conceived from your due date or last period, plus the window of days when intercourse most likely led to the pregnancy.
Due date from conception date calculatorIf you know the day you conceived or ovulated, get the estimated due date, the matching last period date and trimester start dates.
Ultrasound due date calculatorEnter the scan date and the pregnancy age from the ultrasound report in weeks and days to get the due date and the matching last period date.
IVF due date calculatorWork out an IVF due date from the embryo transfer date and embryo age, or from the egg retrieval date, with the pregnancy age on transfer day.
Pregnancy calendar week by weekA table of start and end dates for all 40 pregnancy weeks and the trimester each falls in, built from your last period and cycle length.
Ovulation and fertile days calculatorEstimate your ovulation day, the six-day fertile window and your next period from your last period and cycle length, with a table for six cycles.
Next period calculatorFind when your next period starts and ends, with a calendar of upcoming periods for as many cycles as you choose, up to 12.
Menstrual cycle length calculatorPaste the start dates of your past periods to get your average cycle length, shortest and longest cycle, the spread and your next period.
Implantation date calculatorEstimate the days when an embryo is most likely to implant after ovulation, and when a home pregnancy test gives a dependable result.
Safe period calculator (calendar method)Works out fertile days with the calendar rhythm method (Ogino-Knaus) from your shortest and longest cycle, with a clear warning that other days are not fully safe.
hCG doubling time calculatorEnter two blood hCG results and the hours between them to get the doubling time, the percentage rise and its 48-hour equivalent.
Pregnancy weight gain calculatorSee the recommended pregnancy weight gain for your pre-pregnancy BMI under the 2009 IOM guidelines, for one baby or twins.
Baby age calculator in weeks and monthsHow old is your baby? Enter the birth date to see the age in months and days, in weeks and in total days. Handy for vaccines and checkups.
Corrected age calculator for preemiesWork out the corrected age of a baby born early from the birth date and gestational age at birth, with actual age and weeks born early.
Baby formula amount calculatorEstimate your baby’s daily formula and the amount per feed from body weight, based on AAP guidance, capped at 32 ounces a day.
Newborn weight loss calculatorWork out how much weight your newborn has lost since birth as a percentage, compared with the 7% mark the AAP treats as a signal to check feeding.
Breast milk storage time calculatorFind when pumped breast milk should be used by at room temperature, in the fridge, in the freezer or after thawing, based on CDC guidance.
CRL gestational age calculatorTurn the crown-rump length (CRL) from an early scan into a gestational age in weeks and days and a due date, using the Robinson formula.
Blood alcohol (BAC) calculator, Widmark formulaEstimate blood alcohol concentration (BAC) from drinks, strength, body weight, sex and time elapsed using the Widmark formula.
eGFR calculator (CKD-EPI 2021)Calculate estimated glomerular filtration rate (eGFR) from creatinine, age and sex with the race-free CKD-EPI 2021 equation, plus the stage.
Creatinine clearance calculator (Cockcroft-Gault)Calculate creatinine clearance (CrCl) with the Cockcroft-Gault equation from age, weight, sex and serum creatinine, as used for drug dosing.
QTc calculator (Bazett, Fridericia)Correct the ECG QT interval for heart rate with the Bazett, Fridericia, Framingham and Hodges formulas, with a flag for prolongation.
Mean arterial pressure (MAP) calculatorCalculate mean arterial pressure (MAP) and pulse pressure from your systolic and diastolic blood pressure reading in mmHg.
Anion gap calculatorCalculate the serum anion gap from sodium, chloride and bicarbonate, with optional potassium and an albumin-corrected value.
BSA dose calculator (mg/m²)Work out body surface area with the Mosteller or Du Bois formula, then multiply by the prescribed dose per m² to get the total dose.
IV drip rate calculator (drops per minute)Calculate IV drops per minute and the infusion rate in mL per hour from the fluid volume, infusion time and drip set drop factor.
Sleep cycle bedtime calculatorFind when to go to bed so you wake at the end of a sleep cycle, counting 90 minute cycles plus time to fall asleep from your wake time.
Wake-up time calculator (sleep cycles)Find good times to wake up if you go to bed now or at a set time, counting 90 minute sleep cycles after the time it takes to fall asleep.
Smoking pack-years calculatorCalculate smoking pack-years from cigarettes per day and years smoked, the measure doctors use to judge smoking related risk.
Alcohol units and standard drinks calculatorWork out UK alcohol units, grams of pure alcohol and US standard drinks from a drink volume and its alcohol percentage.
Corrected calcium calculator (albumin)Correct total serum calcium for the albumin level with the Payne formula, in mg/dL or mmol/L units.
Corrected sodium calculator (hyperglycemia)Correct serum sodium for high blood glucose with the Katz and Hillier factors, accepting glucose in mg/dL or mmol/L.
Serum osmolality and osmolal gap calculatorCalculate expected serum osmolality from sodium, glucose and urea, plus the osmolal gap when you enter the measured value.
A-a gradient calculator (alveolar-arterial)Calculate the alveolar-arterial oxygen gradient from blood gas values and inspired oxygen, with the expected value for age.
P/F ratio calculator (PaO2/FiO2)Calculate the PaO2 to FiO2 ratio from a blood gas and the oxygen given, with the matching band from the Berlin ARDS definition.
Glasgow Coma Scale (GCS) calculatorCalculate the Glasgow Coma Scale score from eye, verbal and motor responses, with the brain injury severity and the short code.
Parkland formula burn fluid calculatorCalculate burn resuscitation fluid for the first 24 hours with the Parkland formula from weight and burned area, with the rate for each phase.
Maintenance IV fluid calculator (4-2-1 rule)Calculate maintenance IV fluid needs per hour with the 4-2-1 rule and per day with the Holliday-Segar method from body weight.