About Convertly

Convertly is a free website for converting units of length, mass, temperature, area, volume, time, speed, pressure, energy, power and digital storage.

What you will find here

Convertly has 646 converters covering 85 units in 11 categories. Every converter page shows the result as you type, the formula, a worked example, a conversion table, and frequently asked questions about that specific pair of units.

How conversions are calculated

Each unit is defined once, relative to a base unit for its category, using the exact published definition where one exists. For example, the international inch is exactly 25.4 millimeters and the avoirdupois pound is exactly 0.45359237 kilograms. Every converter uses the same definitions, so a conversion and its reverse always agree. Calculations run in your browser, and results are rounded only for display.

Accuracy and testing

We compare the conversion factors against published SI and NIST definitions and test conversions in both directions. Some units have more than one common definition, such as the calorie, the BTU, the horsepower and the gallon, so each page states which one is used. If you find a result that looks wrong, please contact us with the converter page and the value you entered.

Related calculators

For calculators that go beyond unit conversion, see our sister site Tally Calculators.

Contact

Questions, corrections and feedback are welcome at sohaildomainseo@outlook.com. You can also read the FAQs, the Privacy Policy and the Terms of Use.