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🏠 Home, food & hobbiesFree
Lawn topdressing calculator
Spreading half an inch of sand over 5,000 square feet of lawn takes about 7.72 cubic yards. Enter the lawn area and the layer depth, in inches or millimetres…
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🏠 Home, food & hobbiesFree
Stepping stone calculator
A 20 ft path with stones 2 ft apart, centre to centre, needs 11 stepping stones over 10 gaps, with one stone at each end.
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➗ MathFree
Box method calculator
(2 + 3x) times (4 + 5x) fills four boxes with 8, 10x, 12x and 15x², and the two middle boxes combine into the x term of the product.
A
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➗ MathFree
Cartesian to polar converter
Turn x and y into polar form: the point (3, 4) sits 5 units from the origin at an angle of 0.927295218002 radians.
G
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➗ MathFree
Catenary curve height calculator
Find how high a hanging cable sits at any distance from its lowest point: with a curve parameter of 10, the height 5 units out is 11.27626.
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🏠 Home, food & hobbiesFree
Excavation volume calculator
A 1,200 square foot dig at an average depth of 4 feet moves 4,800 cubic feet of soil, also shown in cubic yards for truck quotes and in cubic metres for metric…
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🏠 Home, food & hobbiesFree
Calculate meal prep containers needed
Three prepared meals a day for 5 days makes 15 meals, and if each one needs 3 separate sections while your boxes have 2, you need 30 containers.
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🏠 Home, food & hobbiesFree
Square footage calculator
A 12 by 10 ft bedroom is 120 sq ft of floor, and with 10% waste you order 132 sq ft. Square yards appear alongside for carpet quotes, so one measurement serves…
A
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🏠 Home, food & hobbiesFree
Tile project cost estimator
20 m² of floor with 10% cutting waste means pricing 22 m² of tile, while the thinset and grout totals you already know are added without extra waste.
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🏠 Home, food & hobbiesFree
Triangle area calculator
A triangle with a 40 ft base and a 25 ft perpendicular height covers 500 sq ft: half of base times height.
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🏠 Home, food & hobbiesFree
Conference room capacity calculator by seating layout
A 1,200 sq ft room set up classroom-style seats 60 people at 20 square feet each. Enter the usable floor area and pick theater, classroom, boardroom or banquet…
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🏠 Home, food & hobbiesFree
Event catering food quantity estimator
A 4-hour buffet for 80 guests calls for 132 pounds of prepared food: 120 pounds for appetite and duration plus a 10% reserve.
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🏠 Home, food & hobbiesFree
Wedding budget breakdown by category calculator
A 30,000 wedding budget becomes 8,400 for the venue, 7,200 for catering and 3,000 for photography, down to 600 for contingency, and every amount adds back to…
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➗ MathFree
Ceiling function calculator
Round any number up to the next whole number: 4.2 becomes 5, −4.2 becomes −4 and 7 stays 7. You also see whether the value was already an integer, so negative…
H
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➗ MathFree
Center of an ellipse
Get the center of an ellipse straight from its general equation: 4x² + 9y² − 8x − 36y + 4 = 0 is centered at (1, 2).
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➗ MathFree
Center of mass calculator
Find where a set of point masses balances: masses of 2, 4 and 3 at (0, 0), (6, 0) and (0, 6) balance at (2.6666666667, 2), with a total mass of 9.
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Runs in your browser
➗ MathFree
Central angle calculator
Turn an arc length and a radius into the angle at the center: an arc of 15.708 on a circle of radius 10 spans 90.00021045915 degrees, or 1.5708 radians.
H
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➗ MathFree
Centroid calculator
Find the middle of a set of points by averaging their coordinates: (0, 0), (4, 0) and (0, 3) have their centroid at (1.3333333333, 1).
G
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🏗️ Engineering & constructionFree
Round-trip average speed
Out at 60 and back at 40 over the same distance averages 48, not 50: the calculator takes the harmonic mean, twice the product of the speeds over their sum, and…
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🏗️ Engineering & constructionFree
Braking distance calculator
At 20 m/s with a steady deceleration of 5 m/s², a vehicle needs 40 m to stop. Enter speed and deceleration to get the braking distance in metres for safety…
A
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🏗️ Engineering & constructionFree
Vertical throw max height calculator
Thrown straight up at 20 m/s with a gravity of 10 m/s², an object rises 20 m and reaches the top after 2 s.
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🧭 Travel & geographyFree
Estimate Parking Spaces Needed for a Building
A 50,000-square-foot building at four spaces per 1,000 square feet needs 200 spaces, and any fraction is rounded up to a whole stall.
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📅 Dates & timeFree
Compare Book Cost per Page
A 480-page book can cost more at the till and still be cheaper per page than a 320-page one. Enter both prices and page counts to see each cost per page, the…
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🏠 Home, food & hobbiesFree
Laundry Cost per Load Calculator for Water and Electricity
A load that uses 0.3 kWh in the washer, 2.5 kWh in the dryer and 15 gallons of water is priced at the electricity and water rates on your own bills, with…
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🏠 Home, food & hobbiesFree
Gym membership cost per visit calculator
A monthly fee of 60 spread over 12 visits comes to 5 per workout. Enter what one month cost and how many times you went in that same month, and check whether…
K
Runs in your browser
🏗️ Engineering & constructionFree
Crosswind heading calculator
At 100 knots of airspeed with a 20-knot crosswind, you must crab about eleven and a half degrees into the wind and your ground speed drops to almost…
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🏗️ Engineering & constructionFree
Thrown downward motion calculator
Thrown down at 5 m/s with a gravity of 9.81 m/s², an object falls 29.62 m in 2 s and reaches 24.62 m/s.
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🎬 VideoFree
Streaming service cost per hour watched calculator
Divide a month's subscription bill by the hours you actually watched: 20 hours of viewing means each hour costs one twentieth of the bill, in the same currency…
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🏠 Home, food & hobbiesFree
Hot desk utilization rate calculator
36 desks booked out of 48 available is a 75% utilization rate. Enter the day's bookings and the desks people could actually reserve, and get one consistent…
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🏠 Home, food & hobbiesFree
Order a Book Series by Publication or Chronological Order
A prequel published third, such as The Founding Voyage, moves to the top of the list in chronological order.
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➗ MathFree
Centroid of a triangle
Find a triangle's balance point from its three corners: vertices (0, 0), (6, 0) and (0, 9) give a centroid at (2, 3), the plain average of their x and y values.
A
Runs in your browser
➗ MathFree
Change of base calculator
Get a logarithm in any base, not just ln or log10: log base 10 of 1000 is 3, worked out as ln 1000 divided by ln 10.
H
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➗ MathFree
Characteristic polynomial calculator
Get the characteristic polynomial of any square matrix up to 12×12: the matrix with rows 2, 1 and 1, 2 gives λ² − 4λ + 3, with its trace of 4 and determinant of…
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🏗️ Engineering & constructionFree
Average velocity from displacement calculator
A net shift of 100 units in 20 time units is an average velocity of 5, positive along your axis: the calculator divides signed displacement by elapsed time, in…
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🏗️ Engineering & constructionFree
Two-phase accelerate-cruise calculator
Accelerating at 2 m/s² up to 10 m/s and then cruising for 5 s covers 75 m in 10 s. Enter acceleration, cruise speed and cruise time to get each phase and the…
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🏗️ Engineering & constructionFree
Velocity-time graph area calculator
Going from 10 to 20 m/s in 5 s covers a displacement of 75 m, the area under that line on a velocity-time graph.
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🧭 Travel & geographyFree
Annual commute time calculator
A 30-minute one-way commute over 240 work days adds up to 240 hours a year, because each day counts the trip to work and the trip home.
K
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📄 Documents & PDFFree
Identify paper size from dimensions in mm or inches
A sheet measuring 210 by 297 mm is A4 under ISO 216, and 297 by 210 is the same size in landscape: enter your measurements in mm or inches, and a 2 mm tolerance…
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Runs in your browser
➗ MathFree
Check similarity in right triangles
Find out whether two right triangles have the same shape: legs of 3 and 4 against legs of 6 and 8 are similar, with a scale factor of 2.
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➗ MathFree
Chinese remainder calculator
Solve simultaneous congruences in one step: x ≡ 2 (mod 3), x ≡ 3 (mod 5) and x ≡ 2 (mod 7) have 23 as their smallest non-negative solution, and the answer…
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Runs in your browser
🏗️ Engineering & constructionFree
Friction stopping distance calculator
An object sliding at 10 m/s with a friction coefficient of 0.3 stops after 16.9952702163 m: enter the speed and the coefficient to get the sliding distance and…
P
Runs in your browser
🏗️ Engineering & constructionFree
Projectile clears wall calculator
Launch at 20 m/s and 45 degrees toward a 5 m wall 30 m away and the path passes at 7.9350375 m, clearing the top by 2.9350375 m. Free in your browser.
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🏗️ Engineering & constructionFree
Optimal launch angle calculator
On flat ground with no air, the farthest throw always leaves at 45 degrees: at 20 m/s that reaches 40.78864851911713 m, the speed squared divided by g.
S
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🏗️ Engineering & constructionFree
Projectile velocity at time
One second after a launch at 20 m/s and 45°, how fast is the ball moving and where is it pointing? Get the speed, the angle above the horizontal and the…
P
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🎬 VideoFree
Concert setlist time budget calculator
In a 25-minute set with 3 minutes of banter, the first three songs use 19.5 minutes and leave 5.5 to spare, while the fourth, a 7-minute closer, would need 1.5…
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🎬 VideoFree
Movie end time calculator
A 142-minute film that starts at 19:30 lets you out at 22:12 once 20 minutes of trailers are added.
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🎬 VideoFree
Playlist total duration calculator
Four tracks that add up to 690.5 seconds average 172.625 seconds each, and the count confirms none was left out.
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📅 Dates & timeFree
Postage stamp calculator
For 2.73 in postage with stamps of 0.68 and 0.21 on hand, the exact answer is 13 stamps of 0.21. Enter the postage and your stamp values to get the count, the…
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Runs in your browser
📄 Documents & PDFFree
QR code error correction capacity lookup
Version 10 at level Q has 154 data codewords, enough for 364 digits, 221 alphanumeric characters or 151 bytes: pick a version from 1 to 40 and a correction…
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💰 Finance & moneyFree
Calculate shipping dimensional weight and billable weight
A 20 × 15 × 10 box with a divisor of 139 is billed by its dimensional weight, not its actual 18. Enter the outer size, the packed weight and your carrier's…
K
Runs in your browser
➗ MathFree
Cholesky decomposition calculator
Split a symmetric positive definite matrix into a lower triangle L times its transpose: the classic 3×3 example whose first row is 4, 12, −16 gives an L with 2…
A
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➗ MathFree
Circle center from three points
Recover the circle behind three measured points: (0, 0), (4, 0) and (0, 3) give a center at (2, 1.5), a radius of 2.5 and the equation (x − 2)² + (y − 1.5)² =…
H
Runs in your browser
➗ MathFree
Circle diameter calculator
Get a circle's diameter from whichever measurement you have: a radius of 5 gives 10, and a tape wrapped around the edge that reads 31.4159 also gives 10 across.
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🏗️ Engineering & constructionFree
Atwood machine tension calculator
Two masses of 5 kg and 3 kg over an ideal pulley, with g at 9.81 m/s², pull the cord taut at 36.7875 N: the calculator applies twice m1 times m2 times g over…
A
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🏗️ Engineering & constructionFree
Frictionless incline acceleration calculator
On a 30-degree frictionless ramp a block accelerates at 4.903325 m/s², exactly half of standard gravity.
S
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📄 Documents & PDFFree
Recommend a barcode symbology for your use case
A shipping label calls for GS1-128, a retail product for EAN-13 and an internal stock label for plain Code 128.
K
Runs in your browser
📄 Documents & PDFFree
Suggest a font pairing by style
An elegant serif heading pairs with Source Sans 3 for body text, with Inter and Lato as alternatives: choose the heading style and the mood, and get a body font…
F
Runs in your browser
📄 Documents & PDFFree
QR Code Version Calculator
100 bytes at error-correction level M need at least version 6, a grid of 41 modules per side with room for 106 bytes, leaving 6 spare: enter the byte length and…
B
Runs in your browser
➗ MathFree
Circle length calculator
Work out the length around a circle from whichever measurement you have, the radius or the diameter, where a radius of 5 gives 31.415927.
G
Runs in your browser
🏗️ Engineering & constructionFree
Elevator apparent weight calculator
A 70 kg rider in a cabin accelerating upward at 2 m/s² reads 826 N on the scale, with gravity at 9.8 m/s².
S
Runs in your browser
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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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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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