Unit Converter

A Unit Converter translates a quantity from one unit of measurement into another - 30 centimeters into inches, 180 pounds into kilograms, 25 °C into Fahrenheit, 500 megabytes into mebibytes. Behind each conversion is a fixed factor defined by international standards, and this tool applies those factors exactly rather than the rounded approximations people carry around in their heads.

As a temperature unit converter, it takes 37 °C and lists 98.6 °F, 310.15 K and 558.27 °R in the all-units table at once. The same page works as a pressure unit converter, where 32 psi comes out as 2.2063223 bar or 220.63223 kPa, and as a length unit converter, where 6 ft is exactly 1.8288 m. Click a category button to switch between them: the number you typed stays in the box and the units reset to that category's defaults.

The converter covers eleven categories: length, weight, temperature, area, volume, speed, time, data, pressure, energy, and angle. Within each category every unit is expressed as a ratio to a single base unit, so converting is a single multiply-and-divide with no accumulated rounding. Temperature is handled separately because Celsius, Fahrenheit, Kelvin, and Rankine are affine scales with different zero points, not simple multiples of each other.

It runs entirely in your browser, updates as you type, and shows the value in every other unit of the category at once - so you get the answer you asked for plus the ones you were about to ask for. Nothing is uploaded and nothing is stored, and the tool keeps working with no network connection once the page has loaded.

Two categories behave differently from the rest and are worth understanding. Temperature is an interval scale rather than a ratio one, so conversions apply an offset as well as a factor: 20 degrees Celsius is not twice 10, and a difference of 10 degrees is not the same conversion as a reading of 10 degrees. Data units are the other, and the ambiguity is genuine rather than pedantic. A kilobyte is 1,000 bytes under the SI definition used by drive manufacturers and 1,024 under the binary convention used by most operating systems, which is the entire reason a 1TB drive shows as roughly 931GB in a file manager. Both are offered here, with the binary units under their correct names of kibibyte and mebibyte.