About Convert All Units
Convert All Units is a free converter for the measurements people actually run into: length, weight, volume, area, temperature, speed, time, data size, energy, power, pressure, angles, fuel economy, US construction units, cooking measures, live currency and number-to-words.
It also covers what many big converters skip: Indian land units (cent, ground, guntha), India-specific weights such as the tola and quintal, the AC “ton”, lakh/crore number formatting, and ingredient-specific cup-to-gram cooking conversions.
How the conversions work
- Length, mass, volume, area, energy, power, pressure and the rest use the exact international definitions (for example 1 inch = 25.4 mm exactly, 1 pound = 0.45359237 kg exactly, 1 US gallon = 3.785411784 L exactly).
- Temperature and fuel economy use their true formulas, not simple ratios, and impossible values (below absolute zero) are rejected.
- Currency rates are downloaded live from public rate feeds and cached so the converter still works briefly offline. They are indicative only.
- Cooking conversions use typical gram-per-cup values and are approximations; weigh ingredients when precision matters.
Everything you type is processed in your browser or on your device.
How we check the numbers
Every unit is defined once, in one shared conversion engine used by both this website and the Android app, so the two always give the same answer. Automated tests compare the engine against the published definitions (for example 1 acre = 43,560 sq ft, 1 cent = 1/100 acre, 1 guntha = 1/40 acre) and against worked examples before any change goes live. The reference tables and guides on this site are generated by that same engine, not typed in by hand.
Where a unit has no single legal definition, we say so. Bigha, kanal and marla are not included because their size changes from state to state; the ground is shown with its Chennai value of 2,400 sq ft.
Who makes Convert All Units
Convert All Units is built and maintained by Equisteg, an independent software company based in India. It is free to use and supported by advertising. There is no account to create and nothing to install on the web.
Open-source software
Convert All Units is built with open-source software. The packages, their authors and their licences are listed in the open-source licences file.
Contact
Found a wrong value, a missing unit or a bug? Write to contact@convertallunits.equisteg.com. Please include the page and the numbers you entered.