Calculators
92 Tools
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Timestamp Tools 7
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Current Unix TimeLive clock showing Unix time in seconds and milliseconds.Timestamp to Date ConverterTurn a timestamp (s/ms/µs) into a formatted date instantly.Date to Timestamp ConverterConvert a calendar date & time into Unix epoch seconds.Milliseconds ConverterConvert milliseconds to seconds, minutes, hours and days.Time Difference CalculatorDistance between two timestamps or dates in every unit.From UNIX TimestampConverts a UNIX timestamp to a datetime string. e.g. 978346800 becomes Mon 1 January 2001 11:00:00 UTC A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).
Date & Time Tools 9
Date Format ConverterRender any date in ISO, RFC, locale and custom formats.Days Between DatesCount days (and weeks/months) between two calendar dates.Date Add / Subtract CalculatorAdd or subtract days, weeks, months from a date.Timezone ConverterCompare times across world timezones instantly.Leap Year CheckerCheck whether a year is a leap year and why.Age CalculatorExact age in years, months, days, hours and total days.
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ISO Week Number CalculatorFind the ISO-8601 week and weekday of any date.Get TimeGenerates a timestamp showing the amount of time since the UNIX epoch (1970-01-01 00:00:00 UTC). Uses the W3C High Resolution Time API.Parse DateTimeParses a DateTime string in your specified format and displays it in whichever timezone you choose with the following information: Date Time Period (AM/PM) Timezone UTC offset Daylight Saving Time Leap year Days in this month Day of year We
Number Tools 13
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Hex / Decimal / Binary Live ConverterEdit hex, dec, oct and bin simultaneously — all stay in sync.Roman Numeral ConverterConvert between Roman numerals and Arabic numbers.Number to Words ConverterSpell out numbers in English words (cheques, captions).Percentage CalculatorPercent of, increase/decrease and ratio problems.Random Number GeneratorCryptographically random integers in any range.Number FormatterThousands separators and fixed decimals for any locale.Factorial CalculatorExact big-integer factorials.GCD & LCM CalculatorGreatest common divisor and least common multiple of a list.Prime Number CheckerTest primality and show the smallest factor.Convert data unitsConverts a unit of data to another format.Convert distanceConverts a unit of distance to another format.Unicode Text FormatAdds Unicode combining characters to change formatting of plaintext.
UUID Tools 7
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UUID v7 GeneratorTime-ordered sortable UUIDs for databases.ULID Generator26-character lexicographically sortable unique IDs.GUID GeneratorMicrosoft-style bracketed GUIDs.UUID ValidatorValidate a UUID/GUID and detect its version & variant.Generate all checksumsGenerates all available checksums for the input.Generate UUIDGenerates an RFC 9562 (formerly RFC 4122) compliant Universally Unique Identifier (UUID),
Unit Converters 25
Length ConverterConvert metres, kilometres, centimetres, inches, feet, yards, miles and nautical miles.Weight ConverterConvert kilograms, grams, tonnes, pounds, ounces, stones and carats.Temperature ConverterConvert Celsius, Fahrenheit, Kelvin and Rankine with the formulas shown.Volume ConverterConvert litres, millilitres, US and imperial gallons, cups, pints, quarts and fluid ounces.Speed ConverterConvert km/h, mph, metres per second, knots, feet per second and Mach number.Area ConverterConvert square metres, hectares, acres, square feet, square inches and square miles.
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Pressure ConverterConvert pascbar, psi, atm, torr, mmHg, kgf/cm² and inches of mercury.Energy ConverterConvert joules, kilowatt-hours, calories, kilocalories, BTU, electronvolts and tonnes of oil equivalent.Power ConverterConvert watts, kilowatts, mechanical and metric horsepower, BTU/h and kcal/h.Angle ConverterConvert degrees, radians, gradians, arcminutes, arcseconds and turns.Time Duration ConverterConvert nanoseconds to centuries: seconds, minutes, hours, days, weeks, months and years.Data Storage ConverterConvert bits, bytes and SI versus IEC multiples — kB, MB, GB, KiB, MiB, GiB, TiB.Typography Unit ConverterConvert CSS px, pt, pc, mm, cm, in, Q and didot/cicero at the standard 96 dpi reference.Frequency ConverterConvert hertz, kilohertz, megahertz, gigahertz, RPM and radians per second.Data Rate ConverterConvert bandwidth between bit/s, kbit/s, Mbit/s, Gbit/s and byte-per-second units including IEC multiples.Force ConverterConvert newtons, kilonewtons, dynes, kilogram-force, pound-force, ounce-force, poundals and kips.Torque ConverterConvert newton-metres, kgf·m, kgf·cm, lbf·ft, lbf·in, ozf·in and dyne-centimetres.Density ConverterConvert kg/m³, g/cm³, g/mL, lb/ft³, lb/in³ and tonnes per cubic metre.Radiation Dose ConverterConvert gray, rad, sievert and rem including milli and micro prefixes.Viscosity ConverterConvert dynamic viscosity between Pa·s, mPa·s, centipoise, poise and lbf·s/ft².Luminance ConverterConvert cd/m², nits, lamberts, foot-lamberts, stilbs and cd/cm².Illuminance ConverterConvert lux, kilolux, phot, foot-candles and lumens per square foot.Convert areaConverts a unit of area to another format.Convert massConverts a unit of mass to another format.Convert speedConverts a unit of speed to another format.
Math & Statistics 16
Statistics CalculatorMean, median, mode, range, variance, standard deviation, standard error, quartiles and IQR from a list of numbers.Percentile CalculatorCompute any percentile of a data set with linear interpolation, plus all deciles.Correlation CalculatorPearson and Spearman correlation, r², and the least-squares regression line for paired data.Combination CalculatorC(n,r) with exact BigInt arithmetic and a list of the actual combinations for small inputs.Permutation CalculatorP(n,r) ordered arrangements computed exactly with BigInt — no floating point rounding.Prime Factorization CalculatorBreak any integer into prime factors and list every divisor with the divisor count.
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Prime Number CheckerTest whether a number is prime and, if not, show its smallest divisors and divisor count.Primes Up To NList every prime number up to a limit, with the count.Math Expression CalculatorEvaluate arithmetic expressions with correct precedence, powers, factorials, functions and constants.Fraction CalculatorSimplify fractions, convert decimals to exact fractions and add, subtract, multiply or divide them.Decimal to FractionConvert any decimal to its exact simplest fraction using continued-fraction search with a tolerance.Add and Subtract FractionsAdd, subtract, multiply or divide fractions with the common denominator and GCD reduction shown.Drop bytesCuts a slice of the specified number of bytes out of the data. Negative values are allowed.MeanComputes the mean (average) of a number list. If an item in the string is not a number it is excluded from the list. e.g. 0x0a 8 .5 .5 becomes 4.75Rotate leftRotates each byte to the left by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.Rotate rightRotates each byte to the right by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.
Validators & Checksums 15
Card Number ValidatorValidate a card or IMEI with the Luhn algorithm, detect the brand and derive the missing check digit.ISBN ValidatorCheck ISBN-10 and ISBN-13 check digits and compute the correct one for a truncated ISBN.Barcode Check Digit ValidatorValidate EAN-8, EAN-13, UPC-A and ITF-14 barcodes and see the weighted sum step by step.IBAN ValidatorValidate an IBAN with MOD-97, check the national length and show the rearranged calculation.SWIFT / BIC ValidatorCheck an ISO 9362 BIC and split it into institution, country, location and branch codes.VIN CheckerValidate a 17-character vehicle VIN check digit and decode region, year and plant positions.
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Mod-11 Check Digit ValidatorValidate ISSN, ISMN, ORCID and other mod-11 identifiers, with the weighted sum shown.LEI ValidatorValidate an ISO 17442 Legal Entity Identifier with the ISO 7064 MOD 97-10 scheme.Verhoeff Check ValidatorApply the Verhoeff dihedral-group checksum that catches all single-digit and all transposition errors.Damm Check ValidatorRun the Damm quasigroup checksum, which detects every single-digit error and adjacent transposition.Latitude Longitude ConverterConvert between decimal degrees and degrees-minutes-seconds, with hemisphere and UTM zone hints.Caret/M-decodeDecodes caret or M-encoded strings, i.e. ^M turns into a newline, M-^] turns into 0x9d. Sources such as `cat -v`. Please be aware that when using `cat -v` ^_ (caret-underscore) will not be encoded, but represents a valid encoding (namely thFletcher-16 ChecksumThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties Fletcher-32 ChecksumThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties Fletcher-64 ChecksumThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties