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🔬 ScienceFree
Van der Waals pressure calculator
One mole in 22.4 L at 273.15 K, with a of 3.592 and b of 0.04267, comes out just under 1 atm once attraction and molecular size are counted.
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🔬 ScienceFree
Vapor pressure molar mass calculator
A relative vapor-pressure lowering of 0.02 with 5 mol of solvent and 10 g of solute points to a molar mass of 98 g/mol.
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🔬 ScienceFree
Volume percent calculator
25 mL of solute in 100 mL of solution is 25 % v/v. Enter both volumes in the same unit and get the percent by volume plus the volume fraction, ready for a…
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🔬 ScienceFree
Volume-to-volume gas stoichiometry calculator
With 2 H₂ + O₂, 4 litres of hydrogen react with 2 litres of oxygen. Enter the known gas volume and the two coefficients from the balanced equation; at the same…
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🔬 ScienceFree
Work of gas expansion calculator
A gas expanding by 2 L against a constant 1.5 atm does −3 L·atm of work under the chemistry sign convention.
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🔬 ScienceFree
Zero-order half-life calculator
With k of 0.05 and a starting concentration of 1, the zero-order half-life is 10 time units. Enter the rate constant and the initial concentration to see how…
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🖼️ ImagesFree
WCAG contrast ratio checker
See whether text stays readable on its background by WCAG rules: #111827 on white reaches 17.74 to 1, passing AA and AAA for both normal and large text.
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🖼️ ImagesFree
RGB to hex converter
Get the hex code for any RGB color: 255, 128, 0 is #ff8000, an orange. The six digits come in lowercase, uppercase and without the hash, ready for a stylesheet…
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🖼️ ImagesFree
RGB to HSV converter
Turn an RGB color into the numbers a color wheel uses: orange 255, 128, 0 has a hue of about 30° with saturation 1 and value 1.
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🖼️ ImagesFree
RGB to LAB converter
Move an RGB color into Lab, where lightness runs from 0 for black to about 100 for white and two axes carry the hue.
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🖼️ ImagesFree
Color temperature to RGB
Type the Kelvin value of a light and see its color: 6500 K, noon daylight, comes out as 255, 254 and 250, or #fffefa.
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🖼️ ImagesFree
Tetradic color scheme generator
Enter #e74c3c and get four colors forming two opposite pairs: the red with cyan #3cd7e7, and lime #d7e73c with its own opposite, at 0, 60, 180 and 240 degrees…
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➗ MathFree
Combinations with repetition
Count selections where each type can repeat and order does not matter: 3 picks from 5 types give 35, which is C(7, 3), the same stars-and-bars count used for…
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➗ MathFree
Handshake problem calculator
Find how many handshakes happen when everyone in a group greets everyone else once: 5 people make 10 handshakes and 4 make 6, and a total such as 10 turns back…
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➗ MathFree
Monotone lattice paths on an a×b grid
Count the routes across a grid that only move right or up: reaching the point 2 across and 3 up takes one of 10 paths, C(5, 2), while a 2 by 2 square has 6.
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➗ MathFree
Unsigned Stirling numbers of the first kind
Count the arrangements of n items that break into exactly k cycles: 5 items in 2 cycles give 50, 4 items in 2 cycles give 11, and 3 items in one cycle give 2.
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🏠 Home, food & hobbiesFree
Butter measurement converter
One US stick of butter is 8 tablespoons, half a cup, 4 ounces or 113.3980925 grams. Enter an amount in any of those five units and read all the others at once…
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🏠 Home, food & hobbiesFree
Cake tin size converter
An 8-inch round tin covers the same area as a square tin with sides of about 7.09 inches. Enter a diameter or a side in inches or centimeters and get the…
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🏠 Home, food & hobbiesFree
Honey cups to grams converter
One US cup of honey weighs about 336 g and holds 16 tablespoons, because honey is set at 1.42 g per milliliter.
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🏠 Home, food & hobbiesFree
Pints to liters converter
One US pint is 0.473176473 L and one UK pint is 0.56826125 L, about 20% more: choose the pint your recipe or menu means and convert to liters or back.
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🏠 Home, food & hobbiesFree
Teaspoons to ml converter
One US teaspoon is 4.92892159375 ml, about 4.93, while a metric teaspoon is exactly 5 ml, so 3 metric teaspoons make 15 ml.
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📅 Dates & timeFree
Add months to a date
Add whole months to a date and get the later calendar day: 31 January 2024 plus 1 month is 29 February 2024, because a day that does not exist moves to the last…
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📅 Dates & timeFree
Birthstone by birth month
Enter a birth month and see its traditional and modern birthstones side by side: for March, the traditional chart lists bloodstone and jasper, while the modern…
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📅 Dates & timeFree
Chinese zodiac sign calculator
2024 is the Year of the Dragon, yet someone born on 9 February 2024 is still a Rabbit, because the animal changes at Chinese New Year, not on 1 January.
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📅 Dates & timeFree
Days between two dates
From 1 January to 11 January 2024 there are 10 days. Enter two dates to get the whole number of calendar days between them, plus a signed figure that shows…
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📅 Dates & timeFree
Days elapsed in the year
By 15 March 2024, 74 whole days of the year have passed, which makes it day 75 of a leap year. Enter a date to see how many days have gone by since 1 January…
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📅 Dates & timeFree
Easter Sunday date calculator
Easter Sunday fell on 31 March in 2024 and on 20 April in 2025. Type any year from 1 to 9999 and get the Western Easter Sunday as a full date, plus its month…
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📅 Dates & timeFree
Julian Day to date converter
Paste a Julian Day number and get the calendar date and clock time it marks: JD 2451545 is noon UT on 1 January 2000, and 2451544.5 is the midnight that starts…
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📅 Dates & timeFree
Golden number and epact calculator
Enter a year and get its ecclesiastical numbers: 2026 is year 13 of the 19-year Metonic cycle and has Gregorian epact 11.
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📅 Dates & timeFree
ISO week number calculator
Type a date and get its ISO week: 2024-01-01 is week 1 of 2024, while 2021-01-01 still sits in week 53 of 2020.
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📅 Dates & timeFree
ISO week to date converter
Turn an ISO week label into a real calendar day: Monday of week 1 of 2024 is 2024-01-01, and Monday of week 1 of 2015 falls back to 2014-12-29.
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📅 Dates & timeFree
First and last day of month
Pick a year and a month to get its first and last dates: February 2024 runs from 2024-02-01 to 2024-02-29, while February 2023 ends on 2023-02-28.
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📅 Dates & timeFree
Next leap year finder
From 2023 the next leap year is 2024, and from 1899 it is 1904, because 1900 has no February 29. Type a year and get the first leap year on or after it, plus…
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📅 Dates & timeFree
Next occurrence of a weekday
From Friday 15 March 2024, the next Monday is 18 March 2024, three days later. Pick a date and a weekday to get the soonest matching day on or after it, handy…
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📅 Dates & timeFree
Subtract days from a date
Enter a date and a number of days to get the exact earlier day: 15 March 2024 minus 10 days is 5 March 2024.
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🏗️ Engineering & constructionFree
Antenna length calculator
Type a frequency and get the wavelength in vacuum with the quarter-wave and half-wave element lengths: 100 MHz gives about 3 m, 75 cm and 1.5 m.
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🏗️ Engineering & constructionFree
Battery runtime calculator
Divide the usable energy in watt-hours by the load power in watts to see how long a pack keeps a device running: 72 Wh into a 12 W load lasts 6 hours.
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🏗️ Engineering & constructionFree
Capacitor energy calculator
A 1000 µF capacitor charged to 12 V holds 0.072 J. Enter the capacitance in farads and the voltage in volts to get the stored energy; a negative voltage gives…
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🏗️ Engineering & constructionFree
Speaker crossover calculator
A 1 mH inductor with a 10 µF capacitor sets a crossover corner close to 1592 Hz. Enter the inductance in henries and the capacitance in farads to see where a…
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🏗️ Engineering & constructionFree
dBm to dBW calculator
A 30 dBm transmitter is 0 dBW, because dBm counts from one milliwatt and dBW from one watt, always 30 dB apart.
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🏗️ Engineering & constructionFree
dBm to watts calculator
A level of 30 dBm is exactly 1 W, or 1000 mW, and 0 dBm is one milliwatt. Enter a reading in dBm from an analyzer or a datasheet and get the linear power in…
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🏗️ Engineering & constructionFree
Electric potential calculator
One microcoulomb seen from 10 centimetres sits at roughly 9 × 10⁴ volts, counted from zero at infinity.
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🏗️ Engineering & constructionFree
EMF terminal voltage calculator
A 12 V cell with 0.5 Ω of internal resistance delivering 2 A shows 11 V at its terminals, because 1 V is lost inside.
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🏗️ Engineering & constructionFree
Inductor energy calculator
A 0.1 H coil carrying 2 A stores 0.2 J in its magnetic field. Enter the inductance and the current; a reversed current stores the same energy as a forward one…
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🏗️ Engineering & constructionFree
kWh calculator
A 1000 W load running for 2 hours uses 2 kWh, the unit printed on utility bills and appliance labels.
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🏗️ Engineering & constructionFree
Inverting amplifier calculator
Matched resistors give a gain of −1 and a ten-to-one feedback ratio gives −10: enter Rin and Rf and get the ideal closed-loop gain of an inverting amplifier…
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🏗️ Engineering & constructionFree
Electrical power calculator
12 volts at 2 amperes is 24 watts, and you also see the 6 Ω that pair implies. Enter any two of voltage, current and resistance to get the power and the missing…
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🏗️ Engineering & constructionFree
Parallel resistance calculator
Two 10 Ω resistors in parallel give 5 Ω, and three 100 Ω resistors give about 33.3 Ω. Enter the value of each branch to get the single equivalent resistance…
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🏗️ Engineering & constructionFree
RLC resonant frequency calculator
With 1 mH, 1 µF and 10 Ω, a series RLC circuit resonates at about 5 kHz with a Q of about 3. Enter the three values to get the resonant frequency, the angular…
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🏗️ Engineering & constructionFree
Smoothing capacitor calculator
A 1 A load on 50 Hz mains with 1 V of ripple needs 10 000 µF after a full-wave rectifier, because the ripple runs at 100 Hz.
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🏗️ Engineering & constructionFree
Solenoid magnetic field calculator
1000 turns per metre carrying 2 A produce about 2.513 mT inside a long ideal solenoid. Enter the turn density and the current to get the interior field in…
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⚙️ Developer UtilitiesFree
Baconian cipher encoder and decoder
Turn letters into Francis Bacon's five-symbol a and b codes, or decode a stream of them back into letters: HI becomes aabbb abaaa.
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⚙️ Developer UtilitiesFree
Base45 encoder and decoder
AB becomes BB8 in Base45, the RFC 9285 encoding that keeps data within the 45 characters a QR code reads in alphanumeric mode, as EU Digital COVID Certificates…
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⚙️ Developer UtilitiesFree
Base64url encoder and decoder
“hello world” becomes aGVsbG8gd29ybGQ in Base64url, the URL-safe Base64 of RFC 4648 section 5 that uses minus and underscore instead of plus and slash and drops…
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⚙️ Developer UtilitiesFree
Columnar transposition cipher
Under the keyword ZEBRAS, WEAREDISCOVEREDFLEEATONCE becomes EVLNACDTESEAROFODEECWIREE: the text is written in rows six columns wide and read column by column in…
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⚙️ Developer UtilitiesFree
Text to ASCII codes converter
Type Hi and get 72 105, or paste 65 66 67 and read ABC: each character becomes its decimal ASCII code and back, and any code outside 0 to 127 is flagged instead…
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⚙️ Developer UtilitiesFree
Four-square cipher encoder and decoder
Encrypt letter pairs with Delastelle's four-square cipher and two keywords: HELPME with the keys EXAMPLE and KEYWORD becomes FYNFNE, and the same keywords turn…
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⚙️ Developer UtilitiesFree
HTML entities encoder and decoder
Tom & Jerry <3 becomes Tom & Jerry <3, so the text can sit inside a tag or attribute without breaking it.
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⚙️ Developer UtilitiesFree
Morse code translator
HELLO becomes .... . .-.. .-.. --- in International Morse code: every letter, digit and supported punctuation mark turns into its dots and dashes, with a space…
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⚙️ Developer UtilitiesFree
Quoted-printable encoder and decoder
Turn Hello café into Hello caf=C3=A9 and back again: accents and symbols become equals-sign hex pairs, plain letters stay readable, and soft line breaks keep…
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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.
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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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