Unit Converters
Accurate, privacy-friendly converters — everything runs in your browser.
Area Converter
Indian land units (marla, gaj, kanal, killa, bigha, biswa, katha, dhur) plus square feet, square metre, hectare, are and decare — with per-state values for the units that vary by region.
ConverterTime Converter
Nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days and weeks — including the much-searched milliseconds-to-minutes conversion. Exact factors.
ConverterLength Converter
Metres, kilometres, centimetres, feet, inches, miles and nautical miles, plus traditional units — hand, span, finger, cubit, rod/pole, link and chain.
ConverterVolume Converter
Millilitres, litres, cubic metres, cubic inches and feet, plus US & imperial gallons, quarts, pints, cups, fluid ounces, tablespoons, bushels and barrels.
ConverterEnergy Converter
Energy & work units — joules, kilojoules, megajoules, watt-hours, kilowatt-hours, calories, kilocalories, BTU, foot-pounds, newton-metres and MeV. Convert kJ to kWh, J to Nm, ft-lb to Nm and more.
ConverterSpeed Converter
Convert between speed units.
ConverterAngle Converter
Convert between angle units.
ConverterData size Converter
Convert between data size units.
ConverterWeight Converter
Kilograms, grams, milligrams and micrograms, plus pounds, ounces, stones, tonnes, quintals, short and long tons, troy ounces, grains and carats. Exact factors — 1 lb = 0.45359237 kg.
ConverterPressure Converter
Bar, psi, pascals, kilopascals and megapascals, plus atmospheres, torr, mmHg, inHg, millibars, hectopascals, kgf/cm² and water columns. Every value comes from a fixed definition — 1 bar = 100,000 Pa exactly.
ConverterTemperature Converter
Convert between temperature units.
DeveloperNumber, Text & Data
Hex/decimal/binary/octal number bases, text ↔ binary/hex/ASCII, and CSV ↔ JSON / JSON → HTML.
How these unit converters work
Every converter here works the same way: type a value, choose a from and a to unit, and the answer updates as you type. There is no button to press and nothing is uploaded — the maths runs in JavaScript inside your browser, so conversions are instant, work offline once the page has loaded, and keep your numbers on your own device.
Accuracy comes from defining each unit once, relative to a single base unit — square metres for area, seconds for time, metres for length, and so on — and computing every result from those exact factors instead of storing a rounded number for each pair. That is why marla → gaj always returns exactly 30.25 and milliseconds → minutes always divides by exactly 60,000. Every one of those factors is published, with the definition it comes from, in the dictionary of units of measurement.
Choose a converter
Area & land is the most-used family on the site. It covers Indian land units — marla, gaj, kanal, killa, bigha, biswa, katha and dhur — alongside square feet, square metres, hectares and acres. Because several of those units vary by state, their pages show per-state values rather than one national figure; the Indian land units by state guide explains the history behind that.
The remaining families cover everyday and technical needs: length & distance, volume & capacity, time, temperature, speed, energy & work, angle & rotation, weight & mass, pressure and data size. If you need number bases, text encodings or data formats instead, see number, text & data conversions.
Frequently asked questions
- Are these unit converters accurate?
- Yes. Each unit is defined by one verified factor relative to a base unit (square metres for area, seconds for time, metres for length, and so on), and every result is computed from those factors rather than stored as a rounded number. A build-time accuracy check re-verifies the factors and their round-trips on every release.
- Do I have to be online, or install an app?
- Neither. The conversion runs in JavaScript inside your browser, so it works with no account and no upload. The site is also a Progressive Web App, so once a page has loaded it keeps working offline.
- Why do some Indian land units show different values for different states?
- Units such as bigha, biswa, katha and dhur were never standardised nationally — a bigha in Punjab is not the same size as a bigha in West Bengal. Rather than publish a misleading national average, those pages list the accepted value for each state.
- Is my data or the numbers I convert sent anywhere?
- No. Nothing you type is transmitted to a server or logged. All calculation happens locally on your device.