Online Unit Converter

How to use the unit converter

1. 1

   Select the category

   Click the category you need: Length, Weight, Temperature, Area, Volume, Speed, Digital Storage, Time or Pressure.

2. 2

   Choose units and value

   Select the source unit in the left dropdown, enter the number, and choose the target unit on the right.

3. 3

   Get all results

   The table below shows the conversion to all units in the category at once, with copy buttons for each result.

4. 4

   Swap with one click

   Press the swap button to invert source and target without having to reconfigure anything.

All available categories

The converter covers 9 categories with more than 80 units in total. Length includes from nanometres to light years. Mass goes from micrograms to long tons. Temperature converts between Celsius, Fahrenheit, Kelvin and Rankine. Area covers from square millimetres to square miles and acres. Volume includes metric and imperial units, with cups, pints and gallons from both systems. Speed ranges from metres per second to Mach and the speed of light. Digital storage differentiates between SI and binary units (KB/KiB, MB/MiB, GB/GiB). Time goes from nanoseconds to centuries. Pressure includes Pascal, Bar, PSI, atmospheres and mmHg.

All calculations are performed using floating-point arithmetic in the browser. For linear units, a conversion factor to a base unit (metre, kilogram, etc.) is used and then divided by the target unit's factor. For temperature, which is not linear, exact algebraic formulas are used.

Frequently asked questions