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❤️ Health & fitnessFree
Sodium deficit calculator
Estimate the sodium needed to bring serum sodium up to a target: a 70 kg man going from 120 to 140 mEq/L has about 42 litres of body water, so the deficit is…
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Sodium in salt calculator
Turn grams of salt into milligrams of sodium: 5 g of pure table salt, at a sodium share of 0.3934, holds 1967 mg of sodium.
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SOFA score calculator
Grade six organ systems from 0 to 4 and add them up: ratio 250, platelets 80, bilirubin 2.4, mean pressure under 70, Glasgow 14 and creatinine 1.5 give a SOFA…
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Sperm analysis calculator
Compare a semen analysis with the WHO 2021 lower reference limits: 2.5 mL, 45 million per mL, 55% total motility and 8% normal forms are all normal, for a total…
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Standard drink calculator
Turn a real pour into standard drinks from its volume, alcohol percentage and the country you choose.
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Corticosteroid converter
Convert a dose of one systemic corticosteroid into the matching dose of another: 20 mg of prednisone equals 80 mg of hydrocortisone or 0.75 mg of dexamethasone…
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Stillbirth risk calculator
Estimate the chance of stillbirth over the rest of pregnancy from the week, the mother's age and optional risk factors: at 39 weeks and age 28 with none, it is…
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STOP-BANG calculator
Answer eight yes-or-no questions on snoring, tiredness, observed pauses, blood pressure, BMI over 35, age over 50, neck over 40 cm and male sex.
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Stroke volume calculator
Subtract end-systolic from end-diastolic volume to get the blood pumped out in one beat: 120 mL minus 50 mL is a stroke volume of 70 mL, shown with its ejection…
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Sugar intake calculator
Turn your daily calories into a ceiling for added sugar: on 2000 calories at the common 10% guideline, that is 200 calories or 50 g of added sugar, about 12.5…
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Swiss cheese coronavirus
Stack protection layers and see the infection risk that still gets through: a 70% mask, 50% better ventilation and an 80% vaccine leave a 3% residual, because…
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T/E2 ratio calculator
Divide total testosterone by estradiol to get the T/E2 ratio: 500 ng/dL of testosterone with 25 pg/mL of estradiol gives a ratio of 20.
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Tidal volume calculator
A man 170 cm tall has a predicted body weight of 66 kg, so the lung-protective 6 mL per kilogram gives about 396 mL per breath.
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Time of death estimator
A body at 32.5 °C in a room at 18 °C, weighing 70 kg, has been cooling for about seven and a half hours by the Henssge method.
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TIMI STEMI risk score
A 72-year-old with low blood pressure, a fast pulse, Killip class II and anterior ST elevation scores 13 of 14 points, a published 30-day mortality of 35.9%.
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TIMI UA/NSTEMI calculator
Six of the seven yes-or-no criteria give a score of 6, which is high risk, with a 14-day event rate of 40.9%: death, a new heart attack or severe ischemia…
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Tinetti fall risk calculator
Balance points of 11 and gait points of 9 give a Tinetti total of 20 out of 28, which falls in the moderate fall-risk band.
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ACR TI-RADS calculator
A solid, hypoechoic, wider-than-tall nodule with smooth margins and no echogenic foci scores 4 points, TR4: fine-needle aspiration from 1.5 cm, follow-up from…
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tPA dose calculator
A 70 kg adult gets 63 mg of alteplase in total: a 6.3 mg bolus and 56.7 mg infused over 60 minutes, at 0.9 mg per kg with a 90 mg ceiling.
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Tramadol dosage calculator
A 70 kg 40-year-old with normal kidneys gets 75 mg of immediate-release tramadol every 6 hours, up to 300 mg a day, as an educational starting estimate.
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Transferrin saturation calculator
Serum iron of 100 with a TIBC of 300 means 33.33% of transferrin's iron-binding sites are occupied.
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TTKG calculator
Urine potassium 40, serum potassium 3, urine osmolality 400 and serum osmolality 300 give a transtubular potassium gradient of 10.
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Twin pregnancy weight gain calculator
With a pre-pregnancy BMI of 22, the recommended twin weight gain at 20 weeks is 7.11 to 11.07 kg, on the way to 16.8 to 24.5 kg near twin term.
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Twin pregnancy probability
A 28-year-old with one previous pregnancy and no twins in the family has about a 1 in 66 chance of a twin pregnancy.
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Tylenol dosage calculator
A 20 kg child's single acetaminophen dose falls between 200 and 300 mg, using the 10 to 15 mg per kilogram band.
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Tylenol overdose calculator
A 70 kg adult who swallowed 7,000 mg of acetaminophen has taken 100 mg per kilogram: the possible-risk band, below the 150 mg/kg treatment line.
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Urine anion gap calculator
Urine sodium 40, potassium 20 and chloride 80 mEq/L give a urine anion gap of −20, the classic classroom pattern of ammonium being excreted after gut losses.
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Urine output calculator
Collecting 840 mL of urine over 12 hours from a 70 kg patient is exactly 1 mL per kilogram per hour, within the adequate teaching band.
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Urine pregnancy test interpreter
An hCG level of 150 mIU/mL four days after a missed period reads as positive, well above the usual 25 mIU/mL strip cut-off.
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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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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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