We build free, fast and accurate unit converters — no sign-up, no download, no fuss. Just open a tool and convert.
UnitConvertTools is a free online resource providing accurate, easy-to-use unit converters across a wide range of measurement categories. Whether you need to convert kilometres to miles, Celsius to Fahrenheit, kilograms to pounds, or bytes to gigabytes — our tools give you an instant, reliable answer.
Our mission is simple: make everyday unit conversions as frictionless as possible. No accounts. No paywalls. No unnecessary complexity. Just accurate results, instantly.
UnitConvertTools covers 12 measurement categories: length, weight, temperature, speed, volume, area, data storage, pressure, energy, time, angle and number bases. Every converter shows results across all common units simultaneously, so you never have to run the same conversion twice.
All conversion factors are based on international standard definitions. Results are accurate to at least 6 significant figures — suitable for everyday use, schoolwork, engineering reference and professional calculations alike.
Our tools are used by students, teachers, engineers, scientists, chefs, travellers, developers and curious minds around the world. Whether you're converting recipe quantities, checking tyre pressure, solving a physics problem or understanding data file sizes, UnitConvertTools has you covered.
The site is entirely free to use and supported by advertising. We appreciate your support every time you use our tools.