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🎓 EducationFree
Test score confidence band
A score of 80 with a standard error of 4 is a range: 80 plus or minus 1.96 × 4 points at 95% confidence.
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🎓 EducationFree
Weighted final two-part grade
Coursework 72 at 40% and an exam 64 at 60% combine into a module mark of 67.2: each mark is multiplied by its weight and divided by the total weight.
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🎓 EducationFree
Language daily minutes for a goal
Fifty hours of language practice in 30 days with one rest day a week leaves 26 practice days and 3,000 minutes to fill: 116 minutes a day, rounded up, or 58 per…
A
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🎓 EducationFree
Long division with remainder
784 divided by 12 is 65 with 4 left over. The tool writes the check, 784 = 12 × 65 + 4, and lists every column step, bring down, multiply and subtract, the way…
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🎓 EducationFree
CEFR level by study hours
750 guided study hours are enough for C1 on the CEFR scale. Enter your hours, and the level you already hold if you have one, to see the highest band reached…
A
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🎓 EducationFree
Greatest common factor calculator
Get the greatest common factor of two or more whole numbers along with every factor they share: 12, 18 and 24 share 1, 2, 3 and 6, so their GCF is 6.
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🏗️ Engineering & constructionFree
Transverse shear stress calculator
Find the shear stress at a chosen fibre of a beam: a shear force of 1000 with a first moment of 20, an inertia of 40 and a width of 5 gives 100.
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🏗️ Engineering & constructionFree
Cantilever UDL moment calculator
A cantilever 4 m long under 10 N per metre carries 40 N in total and a fixed-end moment of 80 N·m, the largest bending moment in the beam.
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🏗️ Engineering & constructionFree
Parallel-axis theorem inertia calculator
Shift a section's moment of inertia to a new parallel axis: 200 about the centroid, with an area of 50 and an offset of 4, becomes 1000, because the transfer…
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🏗️ Engineering & constructionFree
Corrected endurance limit calculator
A machined 32 mm shaft in bending, with a 345 MPa baseline and 690 MPa tensile strength, keeps a corrected endurance limit of about 235 MPa.
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🏗️ Engineering & constructionFree
Principal stress 2D calculator
Turn three plane-stress readings into their extremes: normal stresses of 80 and 20 with a shear of 30 give principal stresses centred on 50, the larger one at…
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🏗️ Engineering & constructionFree
Brinell hardness number calculator
A 3000 kgf load on a 10 mm ball that leaves a 3.4 mm impression gives about 320.583 HBW. Enter the load in kgf, N or lbf to see the depth, the contact area and…
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🏗️ Engineering & constructionFree
Percent reduction of area calculator
Measure how much a tensile bar necked before it broke: an original area of 100 that shrinks to 60 at the fracture gives a reduction of area of 40 %.
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🏗️ Engineering & constructionFree
Colebrook friction factor calculator
For a relative roughness of 0.0002 at a Reynolds number of 100000, the Colebrook equation gives a Darcy friction factor of 0.019005435222 after 4 iterations.
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🏗️ Engineering & constructionFree
Orifice discharge calculator
Find how much liquid passes through a sharp-edged opening: 0.01 m² with a coefficient of 0.61 under 2 m of head lets through about 0.0382 m³/s.
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🏗️ Engineering & constructionFree
Cylindrical pipe conduction calculator
A 10 m pipe with conductivity 45 W/m·K, radii of 0.05 and 0.06 m and an 80 °C drop across the wall passes over a million watts.
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🏗️ Engineering & constructionFree
Gear output torque calculator
An input torque of 50 N·m through a 4:1 reduction becomes 200 N·m at the driven shaft, while speed drops to 0.25 of the input.
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🏗️ Engineering & constructionFree
Conductive heat flux calculator
A wall 0.2 m thick with a conductivity of 0.8 W/m·K and a 25 K difference across it conducts 100 W/m².
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🏗️ Engineering & constructionFree
Overall heat transfer coefficient calculator
Get the U-value of a wall from its layers and air films: 0.2 m of brick with films of 10 and 25 W/(m²·K) comes to just under two and a half W/(m²·K).
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🏗️ Engineering & constructionFree
Power screw efficiency calculator
See how much of your effort a square-thread screw turns into lift: a 5° lead angle with a friction coefficient of 0.15 gives an efficiency of just over a third…
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🏗️ Engineering & constructionFree
Helical spring rate calculator
Find how stiff a compression spring is: 0.002 m wire wound to a 0.016 m mean diameter with 8 active coils, in steel of eighty gigapascals, gives 4882.8125 N/m.
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🏗️ Engineering & constructionFree
Area by double meridian distance
Courses with latitudes 0, 30 and −30 and departures 40, 0 and −40 enclose an area of 600, laid out row by row like a surveying computation sheet.
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🏗️ Engineering & constructionFree
Horizontal curve long chord calculator
A curve with a 300 m radius and a 60-degree deflection has a long chord of exactly 300 m between the start and the end of the curve.
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🏗️ Engineering & constructionFree
Power factor correction kVAR calculator
Find the capacitor bank that lifts your power factor: raising 100 kW from 0.80 to 0.95 takes about 42.13 kvar, and apparent power falls from 125 kVA to about…
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💰 Finance & moneyFree
Gantt task end date calculator
A five-calendar-day task that starts on Thursday 23 July 2026 ends on Monday 27 July, because the start day counts as day one.
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💰 Finance & moneyFree
Work hours overlap percentage calculator
A 9–17 day at UTC−5 and a 9–17 day at UTC+0 share only 3 hours, 14:00 to 17:00 UTC, which is 37.5% of the shorter day.
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🏗️ Engineering & constructionFree
Motor efficiency calculator
Find what share of electrical power a motor turns into shaft power: 800 W out of 1000 W drawn is 80 % efficiency, with 200 W lost.
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💰 Finance & moneyFree
Effort variance calculator
A task planned at 40 hours that took 48 shows an 8-hour overrun, or +20%, and is labeled as one; finishing in fewer hours than planned shows as a negative…
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💰 Finance & moneyFree
No-meeting day time reclaimed calculator
A team of 8 people who each spend 90 minutes a day in meetings gets back 12 hours a week from one no-meeting day: 576 hours, or 72 person-days, over a 48-week…
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💰 Finance & moneyFree
Time to complete task list calculator
Three tasks of 45, 30 and 15 minutes starting at 09:00 take 1h 30m and finish at 10:30. Enter your estimates in order and see each item's start and end, plus…
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💰 Finance & moneyFree
Work-to-break ratio calculator
A 5:1 ratio over a 120-minute session gives 100 minutes of work and 20 of rest, and the two always add back to the session.
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📅 Dates & timeFree
Booklet page imposition order
An 8-page saddle-stitched booklet prints as 8, 1, 2, 7 on the outer sheet and 6, 3, 4, 5 on the inner one.
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📄 Documents & PDFFree
Label sheets needed calculator
247 labels on 30-up sheets need 9 sheets, not 8, because the last 7 labels still take a whole page: enter how many labels you need and how many fit per sheet…
A
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💰 Finance & moneyFree
Oversize parcel surcharge calculator
Catch a large-package fee before checkout: a 50 × 20 × 15 inch carton weighing 20 lb has a longest side over the 48-inch limit, so a 25 oversize fee lifts an…
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💰 Finance & moneyFree
Shipping cost by zone calculator
Turn weight and distance into a zone-based delivery price: 2.5 kg at a local rate of 4 in zone 3, multiplier 1.55, gives a 15.50 zone charge, and 1.50 of…
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💰 Finance & moneyFree
Cartons per pallet layer calculator
Turn a carton footprint into a layer count before you build the stack: 400 × 300 cartons on a 1200 × 800 pallet fit 6 aligned but 8 when rotated, covering 100%…
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💰 Finance & moneyFree
Postage stamps needed calculator
With postage of 1.50 and stamps worth 0.73, you need 3 stamps: 2.19 on the envelope and 0.69 overpaid.
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🏠 Home, food & hobbiesFree
Household chore rotation calculator
Week 0 gives Alice the dishes, Bob the trash and Carol the vacuuming; each new week moves everyone one chore along, and after 3 weeks each person has done every…
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🏠 Home, food & hobbiesFree
Gym cost per visit calculator
Monthly dues of 49.99 spread over 12 visits come to a little over 4 per workout. Add a join fee spread across the months you plan to stay, extras such as a…
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📅 Dates & timeFree
Weeks lived so far calculator
Someone born on June 15, 1990 has lived 1884 full weeks by July 25, 2026, and is in week 1885 of life.
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📅 Dates & timeFree
Work anniversary date calculator
Someone hired on June 1, 2019 reaches an 8th work anniversary on June 1, 2027, which is 311 days after July 25, 2026.
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📅 Dates & timeFree
Fraction of month elapsed calculator
By 15 February 2024, 15 of the month's 29 days have passed, just over half of the month, with 14 days to go.
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➗ MathFree
Round to nearest multiple
23 rounded to the nearest multiple of 5 is 25. Pick any step, from 5 or 10 down to 0.25, and the calculator snaps your number onto it, shows the multiples on…
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❤️ Health & fitnessFree
Heart rate zones from reserve
Turns your resting pulse and maximum heart rate into five training zones: with 60 and 190 bpm, recovery runs from 125 to 138 bpm and the top zone from 177 to…
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❤️ Health & fitnessFree
Gellish max heart rate calculator
At 40 years old, the Gellish equation puts your maximum heart rate at 179 bpm: 207 minus 0.7 times your age.
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🏠 Home, food & hobbiesFree
Weighted cost split calculator
Split 1000 by weights 2, 1 and 1 and the shares come out as 500, 250 and 250, or use percentages that add up to 100.
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❤️ Health & fitnessFree
Maffetone 180 aerobic heart rate
At 40 with steady training, the Maffetone 180 formula puts your aerobic ceiling at 140 bpm, with an easy window of 130 to 140.
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❤️ Health & fitnessFree
Training impulse TRIMP calculator
An hour at 70% of heart-rate reserve gives a man a Banister training impulse of just over 100 units, one number you can add up across a week of sessions.
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❤️ Health & fitnessFree
Marathon time predictor calculator
A 10 km race run in 40 minutes points to a marathon of about 3:04:00, at 4:22 per kilometre. Enter one shorter race you trust, in kilometres and seconds, and…
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❤️ Health & fitnessFree
Race pace band calculator
A 10 km goal of 50 minutes becomes ten marks at 5:00 each, and a 3:30:00 marathon becomes an even 4:58.613 per kilometre that lands exactly on 42.195 km.
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❤️ Health & fitnessFree
Treadmill incline equivalent pace calculator
Running at 10 km/h on a 5% incline costs as much oxygen as 12.25 km/h on flat ground, a 4:54 kilometre or a 7:53 mile.
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❤️ Health & fitnessFree
Sleep efficiency calculator
Divide the minutes you slept by the minutes you spent in bed: 390 asleep out of 480 in bed gives 81.25% sleep efficiency and 90 minutes awake in bed.
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🏗️ Engineering & constructionFree
Net torque calculator
Set every turning effect about a pivot against the others: clockwise torques adding up to 20 N·m against 25 N·m the other way leave 5 N·m counterclockwise.
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🏗️ Engineering & constructionFree
Gravity neutral point calculator
Two masses of 36 and 4, placed 10 units apart, cancel each other's pull 7.5 units from the heavier one and 2.5 from the lighter one.
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🏗️ Engineering & constructionFree
Pendulum frequency calculator
A 1 m pendulum under standard gravity swings about 0.5 times per second, roughly once every two seconds, and this calculator gives the exact hertz with period…
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🏗️ Engineering & constructionFree
Principle of moments calculator
Hide one of the four values and get it back: 10 N at 1 m on one side balances a force of 20 N placed 0.5 m from the pivot on the other, both moments 10 N·m.
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🏗️ Engineering & constructionFree
Force equilibrium checker
Three forces of (10, 0), (−6, 8) and (−4, −8) add up to zero, so the set is in equilibrium. Enter each load as x and y components and get a clear yes or no…
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➗ MathFree
Long addition calculator
Add two whole numbers the way it is done on paper, column by column with every carry shown: 456 plus 789 gives 1245, with three carries.
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➗ MathFree
Long subtraction calculator
Subtract whole numbers column by column, the way it is taught at school: 905 minus 187 gives 718 with two borrows.
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➗ MathFree
Lowest common denominator calculator
Find the smallest denominator a list of fractions can share: for 1/2, 1/3 and 1/4 it is 12, which gives 6/12, 4/12 and 3/12.
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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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