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⚙️ Developer UtilitiesFree
ROT47 encoder and decoder
Hello becomes w6==@ and the same step brings it back: every printable character from the exclamation mark to the tilde moves 47 places in a ring of 94, while…
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Runs in your browser
⚙️ Developer UtilitiesFree
Flag semaphore translator
HELLO becomes five pairs of flag positions, one per letter: E, for instance, is L:HIGH+R:DOWN, left flag high and right flag down.
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⚙️ Developer UtilitiesFree
Trithemius cipher encoder and decoder
Hello World becomes Hfnos Buytm: the first letter moves 0 places, the second 1, the third 2 and so on, wrapping after Z, while spaces and punctuation stay put.
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⚙️ Developer UtilitiesFree
Vigenère cipher encoder and decoder
Encrypts “Attack at dawn” with the keyword LEMON into “Lxfopv ef rnhr” and decrypts it back with the same key.
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📏 Unit convertersFree
Base36 encoder
255 in base 36 is 73: this converter turns whole numbers into short codes made of digits and the letters A to Z, and decodes them back to decimal.
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📏 Unit convertersFree
BCD converter
42 in 8421 BCD is 0100 0010: each decimal digit gets its own group of four bits, unlike pure binary.
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📏 Unit convertersFree
Binary to decimal converter
1010 in binary is 10 in decimal: enter any run of zeros and ones and get the base-ten number, with each place worth a power of two. Free in your browser.
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📏 Unit convertersFree
Decimal to hex converter
255 in decimal is ff in hexadecimal: enter a whole number and get its base-16 form, with each hex digit standing for four bits, ready for colour codes, logs or…
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📏 Unit convertersFree
Engineering notation converter
12345.6 becomes 12.3456 × 10³, or 12.3456 k: engineering notation keeps the exponent a multiple of three so values line up with SI prefixes on schematics…
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📏 Unit convertersFree
Greek numeral converter
2024 in Ionic Greek numerals is ͵βκδʹ: a left keraia and beta for the thousands, kappa for twenty, delta for four.
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📏 Unit convertersFree
Percent to fraction converter
40% is 2/5 once 40/100 is divided by its greatest common divisor, 20. Decimal and negative percentages work too, and you see the unreduced fraction beside the…
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📏 Unit convertersFree
Roman fraction converter
Seven twelfths of an as is S·, the septunx: S for half plus one dot for an uncia. Enter any count from 0 to 12 for the Roman mark, its Latin name and the…
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📏 Unit convertersFree
Significant figures rounder
1234.567 to three significant figures is 1230, also shown as 1.23e+3. Keep only the digits your measurement supports, with exact halves rounded away from zero…
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🧭 Travel & geographyFree
Along-track distance calculator
Project Paris onto the London to New York great circle and the along-track distance is −264.107681 km: the closest point lies behind London.
S
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🧭 Travel & geographyFree
Compass direction to bearing
SW by S, Southwest by South, is 213.75°: write a direction the way a pilot book or an old ship's log does, and get the heading in degrees clockwise from true…
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Runs in your browser
🧭 Travel & geographyFree
Geohash decoder
Paste a geohash such as u4pruydqqvj and get the center latitude and longitude of its cell, plus margins that show how wide the cell is; eleven characters narrow…
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🧭 Travel & geographyFree
Great-circle path intersection
Enter two start points with their true bearings and see where the great-circle courses meet: 51.8853 N, 0.2545 E on 108.547° and 49.0034 N, 2.5735 E on 32.435°…
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🧭 Travel & geographyFree
Magnetic to true bearing
Convert a compass bearing to a true bearing with your local declination; magnetic 45° with 5.5° east gives true 50.5°, and the reverse conversion back to…
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🧭 Travel & geographyFree
Geographic polygon area
A one-degree box at the equator with corners (0, 0), (0, 1), (1, 1) and (1, 0) covers 12363.71814518 km² on a mean-Earth sphere: a true surface area from map…
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🧭 Travel & geographyFree
Rhumb line distance calculator
Measure the length of a constant-heading route between two points: from 51.5074, -0.1278 to 40.7128, -74.006 the rhumb line is 5794.128754 km at a steady…
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🧭 Travel & geographyFree
Map tile to lat/lon
Find the north-west corner of any web map tile from its column, row and zoom: tile 0/0/0 starts at 85.0511287798° north and 180° west.
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🧭 Travel & geographyFree
UTM to lat/lon converter
Zone 33 north with easting 500,000 m and northing 4,649,776.22482 m sits at latitude 41.9999999991° and longitude 15°, right on the zone's central meridian.
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🧭 Travel & geographyFree
Web Mercator projection calculator
Latitude 40.7128 and longitude -74.006 project to X -8238310.235647004 m and Y 4970071.579142427 m on the EPSG:3857 plane behind most online maps.
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➗ MathFree
Chord length calculator
Get the straight length of a chord from the radius and either the central angle or the distance to the centre: a radius of 5 and an angle of 60° give a chord of…
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➗ MathFree
Circle through three points
Enter three points and get the only circle through all of them: (0, 0), (4, 0) and (0, 3) give a center at (2, 1.5) and a radius of 2.5.
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➗ MathFree
Cone volume calculator
Enter the base radius and height of a cone and get its volume, slant height and surface areas: radius 3 and height 4 give a slant height of exactly 5 and a…
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➗ MathFree
Dodecahedron calculator
Enter one edge of a regular dodecahedron and get its volume and full surface: an edge of 1 gives a volume of about 7.663 and a surface of about 20.646, covering…
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Runs in your browser
➗ MathFree
Ellipse calculator
Enter the two semi-axes of an ellipse and get every key measure at once: semi-axes of 5 and 3 give an area of about 47.12, a perimeter of about 25.5269988628…
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Runs in your browser
➗ MathFree
Line intersection calculator
The lines y equals 2x + 1 and y equals −x + 4 cross at the point (1, 3). Enter two lines in slope-intercept or standard form and get their meeting point, or a…
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➗ MathFree
Pipe volume calculator
A pipe 10 units long with radii 2 and 3 holds 125.6637061436 cubic units inside, and its wall uses 157.0796326795 of material.
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➗ MathFree
Polygon area calculator
Paste the corners of a polygon in order and get its area: the rectangle (0, 0), (4, 0), (4, 3), (0, 3) gives 12, and the sign of the area tells you whether you…
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Runs in your browser
➗ MathFree
Prism surface area calculator
Enter the base perimeter, base area and height of a right prism and get its lateral and total surface: 20, 24 and 5 give a lateral area of 100 and a total of…
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➗ MathFree
Pyramid volume calculator
Enter the height and the base of a pyramid and get its volume: a square base of side 6 and a height of 4 give 48, with a slant height of 5 and a total surface…
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Runs in your browser
➗ MathFree
Rhombus calculator
Enter the two diagonals of a rhombus, or one side and an angle, and get the rest: diagonals of 6 and 8 give a side of 5, an area of 24 and a perimeter of 20.
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Runs in your browser
➗ MathFree
Slope calculator
Enter two points and get the slope of the line through them: from (1, 2) to (4, 8) the rise is 6 and the run is 3, so the slope is 2 and the line climbs at…
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➗ MathFree
Spherical segment calculator
Cut a sphere with two parallel planes and get the slice between them: on a sphere of radius 5, cuts at heights 1 and 4 give a segment 3 high, plus its volume…
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➗ MathFree
Square pyramid volume
Solve a square pyramid from just its base edge and vertical height. An edge of 6 and a height of 4 give a volume of 48, a slant height of 5 and a total surface…
S
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➗ MathFree
Torus volume calculator
Size a ring-shaped solid such as an O-ring, a toroidal vessel or a doughnut box from two radii: a tube radius of 1 around a centre radius of 3 gives a volume of…
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Runs in your browser
➗ MathFree
45-45-90 triangle calculator
Give one leg or the hypotenuse and get every other measure: a leg of 5 means a hypotenuse of 5 times √2 and an area of 12.5.
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➗ MathFree
Circumcenter calculator
Find the point equally far from three vertices and the circle through them: for (0, 0), (4, 0) and (0, 3) the circumcenter is (2, 1.5) and the radius 2.5.
S
Runs in your browser
➗ MathFree
SSA triangle calculator
Two sides and an angle that is not between them can give two different triangles: with a of 10, b of 16 and A of 30°, the third side is 19.8564064606 or…
S
Runs in your browser
❤️ Health & fitnessFree
Calorie deficit calculator
Losing 5 kg in 70 days on 2500 kcal of maintenance means a 550 kcal daily deficit and an intake of about 1950 kcal.
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❤️ Health & fitnessFree
Cycling speed from power calculator
At 200 W with 80 kg of rider and bike on flat ground, you hold roughly 33 to 34 km/h. Change power, weight, grade, wind or aerodynamics to see the steady speed…
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❤️ Health & fitnessFree
Body frame size calculator
Classifies your skeletal frame as small, medium or large from height and wrist size: a 175 cm man with a 17.5 cm wrist has a ratio of 10, which is medium.
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❤️ Health & fitnessFree
Lean body mass calculator
An 80 kg man who is 180 cm tall has about 61.42 kg of lean mass by the Boer equations. Enter weight, height and sex to see how much of your weight is muscle…
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Runs in your browser
❤️ Health & fitnessFree
Maximum heart rate calculator
At 40, the Fox and Tanaka formulas both predict a maximum of 180 bpm and Gulati predicts 170.8, an average of 176.93.
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❤️ Health & fitnessFree
Pace to speed converter
A pace of 5:30 per kilometre is just under 11 km/h, the number to set on a treadmill. Type your pace per kilometre or per mile and get the matching speed in…
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Runs in your browser
❤️ Health & fitnessFree
Pulse pressure calculator
A reading of 120 over 80 has a pulse pressure of 40 mmHg, in the normal band of 40 to 60. Enter the top and bottom numbers from your cuff to see the gap between…
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Runs in your browser
❤️ Health & fitnessFree
Swimming calorie calculator
Estimate the calories you burn in the pool from time, body weight and effort: a 70 kg swimmer at moderate intensity for 45 minutes burns about 436 kcal, or 9.68…
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Runs in your browser
❤️ Health & fitnessFree
Rockport one-mile walk VO2 max calculator
A 40-year-old man weighing 70 kg who walks a mile in 15:30 and finishes with a heart rate of 140 has an estimated VO2 max of 39.2766 mL/kg/min.
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Runs in your browser
❤️ Health & fitnessFree
Walking calorie calculator
A 70 kg walker at 12 minutes per kilometre covers 5 km in 60 minutes at 5 km/h and burns about 248 kcal on flat ground.
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🏠 Home, food & hobbiesFree
Guitar capo key calculator
Chord shapes G, Em, C and D with a capo on fret 2 sound as A, F#m, D and E, in the key of A. Enter your shapes and the fret to get the real chords for piano…
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🏠 Home, food & hobbiesFree
Crochet yarn estimator
A 40 by 50 piece at 4 stitches and 3.5 rows per unit, using 0.02 of yarn per stitch, needs 28000 stitches and 560 units of yarn.
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Runs in your browser
🏠 Home, food & hobbiesFree
Dice probability calculator
Two six-sided dice add up to 7 in 6 of 36 outcomes, a chance of exactly 1/6. Enter how many dice, how many sides and the sum you need, and get the exact odds…
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🏠 Home, food & hobbiesFree
Flash guide number calculator
A guide number of 36 at ISO 100 and a subject 4.5 metres away calls for f/8. Choose whether to solve for aperture or distance, set your ISO and get the…
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🏠 Home, food & hobbiesFree
Frequency to note calculator
440 Hz is A4 with 0 cents, while 445 Hz is still A4 but a few cents sharp. Enter a measured tone and see the closest named pitch, its MIDI number and how far…
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Runs in your browser
🏠 Home, food & hobbiesFree
Hyperfocal distance calculator
A 50 mm lens at f/8 with a 0.03 mm circle of confusion has a hyperfocal distance of roughly ten and a half metres: focus there and everything from half that…
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🏠 Home, food & hobbiesFree
Line height calculator
Body text at 16 px with a 1.5 ratio needs a 24 px line height. Enter any font size and ratio and get the pixel value to write into a fixed layout, a design spec…
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🏠 Home, food & hobbiesFree
500 rule calculator
With a 24 mm lens on full frame, the 500 rule allows about 20.8 seconds before stars trail, and a 50 mm lens on a 1.5 crop body about 6.7: enter focal length…
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🏠 Home, food & hobbiesFree
Baseboard trim calculator
A 40-foot room perimeter with 6 feet of doorways and 8-foot sticks needs 5 pieces of baseboard. Enter the perimeter, the openings and the stock length, and…
S
Runs in your browser
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How it works
1
Get your key
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
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
$0.00
On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
Top up your balance and spend it across web, API and the app. It never expires.