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About

Unit Converter

Sixteen kinds of quantity and 149 units, each built on the exact definition of the unit rather than a rounded table, so a conversion here agrees with the standard’s own value. Type in either field, read the formula behind the pair, and see the value in every other unit of its kind at once.

What it does

  • Length, mass and weight, temperature, area, volume (kitchen cups and spoons, US and imperial), speed, time, and digital storage in decimal and binary units.
  • Data transfer rate, energy, power, pressure, force, angle, frequency and fuel economy.
  • Both fields editable, a swap in one click, and the formula written out.
  • Every unit of the kind at once; a row of the list becomes the target with a click.
  • Feet with inches (5 ft 11 in), pounds with ounces, and inches as a fraction to the nearest sixteenth.
  • Input the way people say it: 5'11", 3 5/8, 1,500.
  • Significant figures of your choosing; whole numbers are never rounded.
  • The kind and the units used last, remembered for next time.

How to use it

  1. Pick the kind of quantity.
  2. Choose the two units and type in either field.
  3. Read the formula, or click a row of the list for another unit.
  4. Copy the result.

What it does not do

  • Currency: it needs live rates from a server, and this page calls none.
  • Ingredients by weight, like a cup of flour in grams: that depends on the ingredient, and the tool converts volume to volume.

Questions

Why is a mile exactly 1.609344 km?

Because that is its definition, fixed by the international yard and pound agreement of 1959. The tool uses definitions, not rounded factors, so every digit is there.

US cups or imperial cups?

Both are in the list, marked US and imp, since the two share a name; the same goes for gallons, pints and fluid ounces.

How is temperature converted?

By formula rather than by a factor, because Celsius and Fahrenheit do not share a zero, and the formula line shows the whole of it. Fuel economy works the same way, since litres per 100 km and miles per gallon run in opposite directions.

What do significant figures do?

They set how many digits the result keeps: at 3, a metre is 3.28 feet; at 6, it is 3.28084. A whole number stays whole whatever the setting.

Everything here runs in your browser. Nothing you type, paste or open is uploaded, and there is no account and no queue. How that works.

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