Health calculators
Estimates and trackers for body, training and wellbeing, for general information only. Body: BMI calculator, BMR calculator, Body fat calculator and Ideal weight calculator. Nutrition: Calorie calculator, Macro calculator, Protein intake and Water intake calculator. Training: Heart rate zones, One-rep max, Pace calculator, Race time predictor and VO2 max calculator. Pregnancy and sleep: Due date calculator, Ovulation calculator, Sleep calculator; plus Meditation timer.
- Pregnancy weight gainTotal gain and weekly rate from your pre-pregnancy BMI (IOM 2009), for one baby or twins, plus the range by week.
- Bra size converterBand and cup from your underbust and bust measurements, and the same size in US, UK, EU, FR and AU systems.
- Bicycle gear calculatorGear ratio, gear inches, development and speed at a cadence from chainring, sprocket and tyre.
- BMI calculatorBody mass index in kg/cm or lb/ft, WHO category and healthy weight range.
- Bowling score calculatorTen-pin bowling scorer with strike and spare bonuses, the 10th frame and a running total per frame.
- Climbing grade converterCompare French sport, YDS, UIAA and British technical climbing grades with a common chart.
- Cycling speed calculatorSpeed from cadence and gear, or the cadence you need for a target speed, with common tyre sizes.
- Darts checkout calculatorBest way to check out from 170 and below with double-out, and a full checkout table.
- Elo rating calculatorExpected score and new Elo ratings for two players after a win, draw or loss, with selectable K factor.
- Golf handicap calculatorWorld Handicap System index from up to 20 rounds: score differentials and the best ones that count.
- Race time predictorPredict a 10K, half marathon or marathon time from a 5K result with the Riegel formula.
- Calorie calculatorDaily calorie needs (TDEE) from Mifflin–St Jeor, with targets to lose or gain weight.
- Weight loss calculatorWeeks to reach a target weight from your maintenance calories and a daily calorie deficit, with safety warnings.
- BMR calculatorBasal metabolic rate by Mifflin–St Jeor, Harris–Benedict and Katch–McArdle side by side.
- Ponderal index calculatorPonderal index in kg/m³ from weight and height, shown next to BMI.
- Caffeine intake calculatorTotal caffeine from your drinks against a daily limit, 400 mg by default.
- Body fat calculatorBody fat percentage from a tape measure (U.S. Navy method), ACE category, fat and lean mass.
- Fiber intake calculatorA daily fiber goal in grams from your calories or from adult intake values by sex and age.
- Smoking savings calculatorMoney saved and cigarettes not smoked, from your daily habit and the price of a pack.
- Ideal weight calculatorIdeal body weight by Devine, Robinson, Miller and Hamwi, plus the healthy BMI range.
- Intermittent fasting timerA countdown for your daily fasting and eating windows, with your start time saved in the browser.
- Box breathing timerA 4-4-4-4 breathing guide with a dot moving round a square and an optional sound.
- Meditation timerA sitting timer with an opening bell, optional interval bells and a closing bell, plus a short settling-in pause.
- Eye break timerA reminder to look away from the screen every 20 minutes for 20 seconds.
- Macro calculatorGrams of protein, fat and carbs from your calories and a chosen split.
- Sleep debt calculatorWeekly sleep debt from seven nights of sleep and your nightly need, with a nightly catch-up estimate.
- Waist-to-hip ratioWaist-to-hip ratio from two tape measurements, compared with the WHO cut-offs of 0.90 (men) and 0.85 (women).
- Lean body mass calculatorLean body mass by the Boer, James and Hume formulas, with the implied body fat percentage.
- Water intake calculatorDaily water by the EFSA reference, a per-kilogram rule of thumb and extra for exercise.
- Pace calculatorPace, finish time or distance from the other two, in km or miles, with splits.
- VO2 max calculatorEstimated VO2 max by the Cooper 12-minute test, the Rockport walk test or the resting heart rate method.
- Child height predictorRough adult height estimate for a boy or girl from the mid-parental height method, with a range of ±8.5 cm.
- Sleep calculatorBedtimes or wake-up times by 90-minute sleep cycles, plus time to fall asleep.
- Due date calculatorDue date from the last period, conception or IVF transfer, with weeks pregnant and trimesters.
- Period calculatorEstimated start dates of your next six periods from your last period, cycle length and period length.
- Heart rate zonesMax heart rate and five training zones from age, by percent of max or the Karvonen method.
- Ovulation calculatorEstimated ovulation, fertile window and next periods for three cycles.
- One-rep maxEstimate your 1RM from a lighter set with three formulas, plus a % of 1RM table by reps.
- Plate loadingWhich plates to put on each side of the barbell for a target weight, in kg or lb.
- Warm-up setsFour ramping warm-up weights up to your working set, rounded to loadable plates.
- Wilks / DOTS scorePowerlifting points from bodyweight and total: original Wilks, Wilks 2020 and DOTS.
- Strength standardsSee your level on the main lifts from your max divided by bodyweight, with the weight for the next level.
- Alcohol unitsUK units, grams of alcohol and US standard drinks from drink volume and ABV, plus weekly totals.
- Calories burnedCalories burned by activity from your weight and minutes, using MET values from the Compendium of Physical Activities.
- FTP and power zonesCycling FTP from a 20-minute test (95 percent) or other tests, with the Coggan power zones in watts.
- Watts per kgCycling power-to-weight in W/kg, with or without the bike, and the power needed for a target.
- Swim CSSCritical swim speed and pace per 100 m or 100 yd from your 400 m and 200 m times.
- Marathon split plannerPer-km or per-mile splits for a goal time, with an even pace or a negative split.
- Blood alcohol calculatorWidmark estimate of blood alcohol content now and at its peak, and the hours until it reaches zero.
- Steps to distanceConvert steps to distance and distance to steps, with stride length estimated from your height.
- Waist-to-height ratioWaist-to-height ratio (WHtR) with the 0.5 rule and NICE risk categories, in cm or inches.
- Body roundness index calculatorBRI from waist and height using the 2013 Thomas et al. ellipse formula, in metric or US units.
- Dog ageDog years to human years by size, plus the epigenetic formula from a 2020 study.
- Sugar intake calculatorDaily added or free sugar limit in grams, teaspoons and calories by WHO or AHA guidance, with grams left today.
- Weight trackerA private weight diary with a line chart and summary, stored only in your browser.
- Mood trackerA private month calendar for rating each day's mood from 1 to 5, with an average and a count per rating.
- Contraction timerOne-tap timer for contraction length, gaps between them and an hourly average.
- Kick counterTap for each baby movement; see the count, the time to 10 and your past sessions.
- Blood sugar converterBlood glucose in mg/dL and mmol/L, both directions.
- Body surface areaBody surface area in m² by the Mosteller, Du Bois and Haycock formulas.
- Workout generatorA random bodyweight workout by time, goal and work/rest pace, with no equipment needed.
- HbA1c converterHbA1c in % and mmol/mol, plus the estimated average glucose.
- Stretching routine generatorA random stretching routine for the body areas you choose, with a step-by-step countdown timer.
- Cholesterol converterCholesterol and triglycerides between mmol/L and mg/dL.
- Blood pressure logA private diary of blood pressure and pulse with chart, averages and CSV export.
- Baby feeding logA private baby log for feeds, diapers and sleep with daily totals and CSV export.
- Gratitude journalA private journal for three grateful moments a day, with a calendar, streak and CSV export.
- Baby wake window calculatorTypical awake time between sleeps by age, and when the next nap window opens.
- Protein intakeDaily protein in grams from body weight and goal, with the amount per meal.