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🔬 ScienceFree
Thermal resistance calculator
A 0.24 m wall with a conductivity of 0.8 W/(m·K) and a 15 m² face has a thermal resistance of 0.02 K/W.
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🔬 ScienceFree
Thin lens equation
A converging lens with a 10 cm focal length and an object 30 cm away forms a real image 15 cm behind it.
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🔬 ScienceFree
Thrust-to-weight calculator
Engines giving 760000 N of thrust on a vehicle weighing 380000 N make a thrust-to-weight ratio of 2, so it lifts off.
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🔬 ScienceFree
Time dilation calculator
At 60% of light speed the Lorentz factor is 1.25, so one second on the moving clock lasts 1.25 seconds for the observer.
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🔬 ScienceFree
Toilet paper race mass moment of inertia
A 0.2 kg roll with radii of 0.02 m and 0.05 m has a moment of inertia of 0.00029 kg·m² and an inertia factor of 0.58.
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🔬 ScienceFree
Torsional spring calculator
A spring of 2 mm wire, 16 mm mean coil diameter, 8 active coils and E of 206000 N/mm² has a rate of 402.34375 N·mm per radian.
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🔬 ScienceFree
Torsional stiffness calculator
A shaft with a shear modulus of 8 × 10¹⁰ Pa, a polar moment of 10⁻⁸ m⁴ and a length of 0.5 m resists twisting with 1600 N·m per radian.
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Transmission coefficient calculator
A wave going from a vacuum at 377 Ω into a medium of 150 Ω passes about eighty-one percent of its power and reflects the rest.
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🔬 ScienceFree
True strain calculator
A 10% stretch, an engineering strain of 0.1, is a true strain of about 9.53%, and doubling a length gives about 0.693, not 1.
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🔬 ScienceFree
Barrel twist rate calculator
A 0.308-inch bullet that is 1.2 inches long needs one turn every 11.858 inches of barrel, written 1:11.858, by Greenhill's formula.
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🔬 ScienceFree
Valve flow coefficient calculator
Water flowing at 20 gallons per minute through a 4 psi drop needs a valve rated Cv 10. Enter the flow, the pressure drop and the specific gravity to get the…
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🔬 ScienceFree
Velocity calculator
Divide the distance travelled by the time it took and get average velocity in metres per second: 100 m in 20 s is 5 m/s.
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🔬 ScienceFree
Vickers hardness number calculator
Turn the test load and the mean impression diagonal into a Vickers hardness number: 10 kgf with a 0.2 mm diagonal gives about four hundred sixty-three HV, the…
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🔬 ScienceFree
Voltage regulation calculator
Compare the voltage with the load disconnected against the voltage at full load and get regulation as a percentage: 220 V at no load and 200 V at full load mean…
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🔬 ScienceFree
Volume to density calculator
Divide a sample's mass by the volume it occupies and get its density: 10 kg in 2 m³ gives 5 kg/m³, and grams over cubic centimetres give g/cm³.
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❤️ Health & fitnessFree
Pokemon GO egg hatch calculator
A 5 km egg with 1.2 km already walked still needs 3.8 km, and you are 24% of the way there. Enter any egg distance, event eggs included, and plan your next…
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❤️ Health & fitnessFree
Plasma osmolality calculator
Sodium of 140, glucose of 90 mg/dL and BUN of 14 mg/dL give a calculated plasma osmolality of 290 mOsm/kg.
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❤️ Health & fitnessFree
Plasma volume
An 80 kg man who is 180 cm tall with a hematocrit of 0.45 has just under 3 litres of plasma, out of a little over 5 litres of blood.
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❤️ Health & fitnessFree
Positive pregnancy test
An hCG of 50 mIU/mL against a 25 mIU/mL strip reads positive, at twice the kit's threshold. Enter your measured level and the sensitivity printed on the box to…
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❤️ Health & fitnessFree
Pregnancy due date calculator
A last period on 1 January 2026 with a 28-day cycle gives a due date of 8 October 2026. Longer or shorter cycles move that date by the difference from 28 days…
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❤️ Health & fitnessFree
Pregnancy test calculator
At 14 days after ovulation, an hCG of 150 mIU/mL gives an estimated pregnancy probability of 100%.
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❤️ Health & fitnessFree
Pregnancy test at 3 weeks
At 3 weeks from your last period, serum hCG is usually 5 to 50 mIU/mL, so a standard 25 mIU/mL home strip has about a 30% chance of turning positive.
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❤️ Health & fitnessFree
Prescription refill calculator
30 tablets at one a day, filled on 1 March 2026, last 30 days, so the next refill falls on 31 March.
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❤️ Health & fitnessFree
Protein deficit calculator
A 70 kg person moving from 1 to 1.6 g of protein per kilo still needs 42 g more. Enter the current level, the target and body weight to get the shortfall in…
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❤️ Health & fitnessFree
Protein-creatinine ratio calculator
Urine protein of 30 mg/dL with creatinine of 150 mg/dL gives a ratio of 0.2 mg/mg, or 200 mg/g, which falls in the mild proteinuria band.
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❤️ Health & fitnessFree
PSA density calculator
A PSA of 4 ng/mL in a 40 cm³ prostate gives a PSA density of 0.1, below the commonly cited 0.15 reference.
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❤️ Health & fitnessFree
PSA doubling time calculator
If PSA rises from 2 to 4 ng/mL in 90 days, it has doubled once, so the doubling time is 90 days, just under 3 months.
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❤️ Health & fitnessFree
PSI calculator
A 65-year-old man with heart failure, a breathing rate of 32 and a blood urea of 35 mg/dL scores 115 points: risk class IV, with about 9.3% 30-day mortality.
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❤️ Health & fitnessFree
PVR calculator
With 400 mL in the bladder before voiding, 350 mL passed and 50 mL left behind, the residual ratio is 12.5% and voiding efficiency 87.5%.
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❤️ Health & fitnessFree
Qp/Qs ratio calculator
Saturations of 98, 70, 99 and 85% give a Qp/Qs of 2: the lungs receive twice the systemic flow, a left-to-right shunt.
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❤️ Health & fitnessFree
qSOFA calculator
24 breaths a minute, a systolic pressure of 95 mmHg and new confusion give a qSOFA of 3 out of 3. Each finding adds one point, and 2 or more is a prompt to look…
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❤️ Health & fitnessFree
QTc calculator
A QT of 400 ms at 80 beats per minute corrects to a QTc just under 462 ms with Bazett's formula, while at 60 beats per minute it stays at 400 ms.
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Quarantine activity calculator
A last exposure on 1 March 2026 with a 14-day quarantine gives a release date of 15 March 2026. Enter the exposure date and the number of days your rules…
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❤️ Health & fitnessFree
Radiation dose calculator
An absorbed dose of 0.002 Gy to the lung from photons, with weighting factors of 1 and 0.12, gives an effective dose of 0.00024 Sv.
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❤️ Health & fitnessFree
RBC indices calculator
A hemoglobin of 15 g/dL, a hematocrit of 45% and a red cell count of 5 give an MCV of 90 fL and an MCH of 30 pg, plus the MCHC.
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RCRI calculator
High-risk surgery plus a history of ischemic heart disease gives an RCRI of 2: risk class III, with a 6.6% rate of major cardiac events in Lee's original study.
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❤️ Health & fitnessFree
Relative fat mass calculator
A man 178 cm tall with an 86 cm waist comes out at 22.6 % body fat on the relative fat mass formula.
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❤️ Health & fitnessFree
REM sleep calculator
Plan 480 minutes of sleep and expect about 116 minutes of REM across 5 complete cycles, roughly 24 % of the night.
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❤️ Health & fitnessFree
Corrected reticulocyte count
With 4.5 % reticulocytes and a hematocrit of 30, the corrected reticulocyte count is 3 %. The observed share is scaled by the patient's hematocrit over a normal…
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❤️ Health & fitnessFree
Reverse due date calculator
A due date of 15 October 2026 points to an estimated conception date of 22 January 2026, 266 days earlier.
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Revised Geneva score
A 70-year-old with a heart rate of 80 and pain in one leg scores 7 points, an intermediate probability of pulmonary embolism.
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❤️ Health & fitnessFree
Revised Trauma Score calculator
Glasgow 15, systolic pressure 120 mmHg and 16 breaths per minute give the maximum Revised Trauma Score of 7.8408.
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❤️ Health & fitnessFree
Type 2 diabetes risk score
A 52-year-old man with a BMI of 28.4, a 96 cm waist, little daily exercise, no daily vegetables, blood pressure pills and a parent with diabetes scores 16…
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❤️ Health & fitnessFree
RSBI calculator
20 breaths a minute of 0.4 litres each give a rapid shallow breathing index of 50, below the commonly taught cutoff of 105.
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❤️ Health & fitnessFree
RMR calculator
A 30-year-old man weighing 80 kg at 180 cm burns about 1780 kcal a day at rest, by the Mifflin-St Jeor equation.
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❤️ Health & fitnessFree
SAAG calculator
Serum albumin of 3.5 g/dL minus ascitic albumin of 1.2 g/dL gives a SAAG of 2.3, above the 1.1 cutoff, so portal hypertension is likely.
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❤️ Health & fitnessFree
SAPS II calculator
A 65-year-old medical ICU admission with normal vital signs and lab values scores 18 SAPS II points, a predicted hospital mortality of about 3 %.
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❤️ Health & fitnessFree
SCORAD calculator
20 % affected skin, intensity signs adding up to 8, and itch and sleep loss scores of 6 and 4 give a SCORAD of 42, in the moderate band.
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❤️ Health & fitnessFree
Sepsis screen - SIRS plus mentation criteria and flag, free
A temperature of 39.2 °C, pulse 110, 24 breaths a minute, white cells at 16 and a Glasgow score of 13 meet all 5 criteria and raise the sepsis flag, which needs…
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Simple daily calorie intake
A sedentary 30-year-old man of 80 kg and 180 cm needs about 2136 kcal a day to keep his weight steady: a basal rate of 1780 kcal times an activity factor of…
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❤️ Health & fitnessFree
Skinfold body fat calculator
A 30-year-old man whose seven skinfolds add up to 91 mm has a body density of 1.068323 and 13.34 % body fat by the Jackson-Pollock seven-site method.
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Sleep cycle calculator
To wake at 07:00 at the end of a cycle, go to bed at 23:15 for five 90-minute cycles or at 21:45 for six, allowing 15 minutes to fall asleep.
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❤️ Health & fitnessFree
Sleep time calculator
Start from the clock you already know, your alarm or your lights-out, and get times that fall on full 90-minute cycles.
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❤️ Health & fitnessFree
Smoking recovery
Enter your quit date, how many years you smoked and a reference date to see how much of the extra lung-cancer risk caused by smoking has faded: 20 years smoked…
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❤️ Health & fitnessFree
SNAP-II neonatal score
Add up the six SNAP-II items from a newborn's worst values in the first 12 hours after admission: mean pressure 25, temperature 35.2 °C, ratio 1.5, pH 7.15 and…
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❤️ Health & fitnessFree
Sobriety calculator
Enter the first day of your sobriety and today's date to see the time in whole years, months and days: from 15 January 2020 to 25 July 2026 is 6 years, 6 months…
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❤️ Health & fitnessFree
Social distancing calculator
Enter the usable floor area and the required distance to get the most people who fit while keeping that gap: 100 square metres at 2 metres gives each person 4…
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Sodium change calculator
See how far serum sodium should move after one litre of fluid: with sodium at 110, 3% saline (513 mEq/L) and 42 litres of body water, it rises by about 9 mEq/L.
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Corrected sodium calculator
See the sodium a patient would have once high blood sugar is accounted for. A measured 130 mmol/L with glucose at 400 mg/dL becomes 134.8 with the Katz factor…
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Sodium correction rate calculator
Divide the planned change in sodium by the hours you have: going from 118 to 126 mEq/L over 24 hours is a third of a mEq/L per hour, or 8 per day.
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Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
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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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