Health & fitness
374 health and fitness calculators: body mass index, calories, ideal weight, heart rate zones, pregnancy dates, hydration and training loads. Clear results with the formula behind them, free in your browser. They inform, they do not diagnose.
URR calculator
A urea level of 80 before dialysis and 24 after gives a urea reduction ratio of 70%: the session removed 56 of every 80 units.
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US vaccine strategy
A 42-year-old healthcare worker lands in Phase 1a of the COVID-19 vaccine allocation the CDC set in December 2020.
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Vaccine efficacy calculator
With 20 infections among 1,000 vaccinated people and 80 among 1,000 on placebo, vaccine efficacy is 75%.
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Vaccine immunity calculator
A vaccine with 95% published efficacy, given as two doses, still provides about two-thirds protection six months later, because the model halves protection…
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Vaccine production time calculator
1,000,000 doses at 50,000 a day on two parallel streams need 10 days of plant time. Enter the campaign size, what one stream finishes per day and how many run…
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Australia vaccine queue
A healthy 72-year-old outside any priority occupation lands in Phase 1b of Australia's 2021 COVID-19 rollout, at a rough place of 3,800,000 in the queue.
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Canada COVID vaccine queue - priority phase calculator
An 82-year-old with no priority job and no high-risk condition lands in phase 1b of Canada's 2021 COVID-19 vaccine sequence.
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England vaccine queue
An 82-year-old with no priority job or condition sits in JCVI group 2 in England, at place 2,679,757 in the queue, with an estimated invitation on 21 December…
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Indian COVID vaccine queue
A 65-year-old with no priority job or comorbidity lands in India's priority group 3, which opened on 1 March 2021, with an estimated wait of 88 days.
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Malaysia COVID vaccine queue - priority phase calculator
A 72-year-old with a comorbidity falls into phase 2 of Malaysia's 2021 PICK vaccination sequence, with both age and health condition counted as reasons.
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Netherlands vaccine queue
A 72-year-old with no risk group lands in Dutch group 6, for ages 70 to 79, in the 2021 Gezondheidsraad and RIVM order.
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Northern Ireland COVID vaccine queue
A 72-year-old with no priority job or clinical risk falls into band 4 of Northern Ireland's 2021 COVID-19 queue, at an estimated place of 243,000.
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Philippines COVID vaccine queue - priority group calculator
A 72-year-old with a comorbidity gets group A2, senior citizens, in the Philippines' 2021 COVID-19 vaccination plan, ahead of the comorbidity group A3.
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South Africa vaccine queue
A 42-year-old frontline healthcare worker lands in Phase 1 of South Africa's 2021 NDoH rollout, the group that received the first doses from mid-February 2021.
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Scottish COVID vaccine queue
In Scotland's 2021 COVID-19 programme, a 72-year-old with no priority job or health condition sits in JCVI group 4, roughly 714,138th in line.
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UK COVID vaccine queue - JCVI priority cohort calculator
An 82-year-old with no priority job or clinical risk is JCVI cohort 2, one of the nine UK Phase 1 cohorts from 2020–21.
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Wales vaccine queue
An 82-year-old with no priority job or clinical risk is group 2 in the Welsh COVID-19 rollout of 2020–21, shared with frontline NHS Wales and social care staff.
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VBAC success calculator
A 28-year-old with a BMI of 24, a prior vaginal birth and a non-recurring reason for her cesarean gets an 89.3023% predicted chance of VBAC success in the…
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Venous blood pH calculator
A venous pH of 7.36 is normal, because it sits inside the adult venous range of 7.31 to 7.41. Enter one reading to see whether it means acidemia, normal or…
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SIR epidemic calculator
With 990 susceptible and 10 infected people, an infection rate of 0.3 and a recovery rate of 0.1, the basic reproduction number is 3 and about 24 people are…
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Vital capacity
A 30-year-old man who is 175 cm tall has a predicted vital capacity of 4.24725 litres by the Baldwin, Cournand and Richards equations.
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Vitamin daily intake calculator
A 30-year-old woman needs 75 mg of vitamin C a day, and 85 mg if she is pregnant. Pick one of thirteen vitamins, enter age, sex and pregnancy status, and get…
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Vitamin A intake calculator
A 30-year-old man needs 900 micrograms RAE of vitamin A a day, and a woman of the same age 700. Enter age and sex to get the daily amount for any life stage…
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Vitamin D calculator
Raising vitamin D from 20 to 40 ng/mL in a 70 kg adult takes about 2000 IU a day under the Holick rule of thumb.
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VLDL cholesterol calculator
Fasting triglycerides of 150 mg/dL give an estimated VLDL cholesterol of 30 mg/dL, because the Friedewald method divides by five.
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VTE risk in pregnancy calculator
A pregnant woman with a BMI of 41, aged 38 and with a previous clot scores 7 points, the high band: the teaching advice is to consider preventive heparin…
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Wake-up calculator
Heading to bed at 23:00, with 15 minutes to drift off, 5 cycles wake you at 06:45 and 6 cycles at 08:15.
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Warfarin dosing calculator
A 65-year-old weighing 80 kg with VKORC1 GG and CYP2C9 *1/*1 gets an estimated starting dose of 41.07 mg per week, about 5.87 mg a day.
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Warsaw method calculator
A meal with 60 g of carbohydrate, 20 g of fat and 30 g of protein, at 10 g per unit, gives 6 units now and 3 units spread over 5 hours, 9 in all.
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Free water deficit calculator
With sodium at 160 mEq/L, a target of 140 and a 70 kg man, the water deficit is 6 litres out of 42 litres of body water.
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Weight gain calculator
With a pre-pregnancy BMI of 22, the recommended gain by week 20 is 4.5 to 6 kg, on the way to 11.5 to 16 kg at term.
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Weight Watchers points calculator
A serving with 150 kcal, 2 g of saturated fat, 12 g of sugar and 8 g of protein scores 3 SmartPoints.
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Weight week by week
Starting at 60 kg with a normal BMI, the expected weight is 65.25 kg at week 20 and 73.75 kg at week 40.
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Wells PE score calculator
Signs of DVT, PE as the leading diagnosis, a heart rate of 110 and a previous clot add up to 9 points: high probability, PE likely.
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Anaerobic threshold calculator
At 30 years old with a resting heart rate of 60, your estimated anaerobic threshold is 170.5 beats per minute: 85% of the reserve between rest and an estimated…
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Batting average calculator
Three hits in ten at-bats is a .300 batting average, written to three decimals exactly as box scores and leaderboards print it.
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Batting strike rate calculator
50 runs off 35 balls is a strike rate of 142.86: runs divided by balls faced, times 100, so a Test grind and a T20 finish can be compared on one scale.
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Bike gear calculator
A 50-tooth chainring, a 12-tooth cog and a 0.68 m wheel give a ratio of 4.167 and about 8.9 metres per crank turn, so you can compare gears by distance rather…
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Bike pace calculator
40 kilometres in two hours is 20 km/h and 3:00 per kilometre: the two figures cyclists quote, from the distance and time your ride computer already shows.
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Bike size calculator
A rider of 175 cm with an 81 cm inseam fits a 54 cm road frame, size M, even though height alone says L: the inseam sets the frame, because standover clearance…
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Calories burned by heart rate
A 30-year-old man of 70 kg averaging 140 bpm for 45 minutes burns more than 500 kcal, worked out from his pulse instead of a guessed activity.
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Calories burned standing calculator
70 kg standing quietly for 60 minutes burns 91 kcal: body weight times hours times 1.3, the published value for quiet standing, already built in.
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Burpee calorie calculator
50 burpees in 5 minutes at 70 kg burn about 49 kcal: your pace of 10 per minute sets the intensity at 8 METs, and the standard oxygen-cost formula does the…
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Cycling heart rate zones
With a maximum heart rate of 190, endurance rides sit at 114–133 bpm and threshold efforts at 152–171: five cycling zones from one measured pulse, either your…
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Cycling wattage calculator
Holding 30 km/h on a flat road with a 70 kg rider, a 10 kg bike and a CdA of 0.32 takes about 150 watts, most of it against the air.
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Cycling training zones
An FTP of 250 watts puts threshold intervals at 225–263 W and neuromuscular sprints from 375 W up: seven Coggan power zones, or five heart-rate zones from your…
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Earned run average calculator
Three earned runs in nine innings is a 3.00 ERA, and one in eight is 1.13: earned runs times nine, divided by innings pitched, with 6.1 and 6.2 read as thirds…
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Effective field goal % calculator
Ten makes, four of them threes, on twenty attempts is an eFG% of 60 against a raw 50: each made three counts as an extra half make, so shooting nights are…
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Elliptical calorie calculator
Thirty minutes on an elliptical at moderate resistance burns 280 kcal for someone weighing 70 kg: your weight and a low, moderate or high resistance band…
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Fat-burning zone calculator
At 30 years old with a resting pulse of 60, your fat-burning zone is 125–151 bpm: 50 to 70 percent of heart-rate reserve, a range you can read straight off a…
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Fish weight calculator
A 20-inch bass with a 12-inch girth weighs about 2.4 pounds, or 1.09 kg: length times girth squared, divided by the shape constant for that species, the formula…
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Arrow FOC calculator
An arrow 30 inches long that balances 18 inches from the nock has a front of center of 10 percent, inside the usual target band: the balance point's lead over…
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Basketball game score calculator
24 points, 10 rebounds and 6 assists on 9-of-18 shooting, with 3 turnovers and 2 fouls, is a game score of 22.7: Hollinger's weights credit efficient scoring…
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Heart rate calculator
At 30 years old your estimated maximum heart rate is 190 bpm: 220 minus your age in whole years, the Fox rule printed on treadmill stickers and club interval…
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Hiking calculator
A 10 km trail with 600 m of climbing takes 3 hours of book time and burns about 1719.9 kcal at 70 kg: Naismith's rule for the clock, and a grade-based effort…
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ICC net run rate calculator
Scoring 250 in 50 overs and conceding 200 in 50 gives a net run rate of 1.000: runs per over scored minus runs per over conceded, with overs like 47.3 read as…
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Lubricant cost to run
Equipment that uses 0.02 litres an hour for 2000 hours needs 40 litres a year, and the tool multiplies that by your unit price to give the year's lubricant…
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Magic mile calculator
A 7:30 Magic Mile predicts about 25:01 for a 5K, 1:57:59 for a half marathon and 4:15:38 for a marathon, using Jeff Galloway's published pace multipliers for…
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Tanaka max heart rate
At 40 years old the Tanaka equation puts your maximum heart rate at 180 bpm: 208 minus 0.7 times age, a research-based ceiling that falls more slowly with age…
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On-base plus slugging calculator
150 hits, 50 walks and 250 total bases in 500 at-bats put a batter's OPS above eight hundred, the mark of a solid regular: on-base percentage plus slugging, one…
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