21 km to miles
All In One Unit Converter
Please, choose a physical quantity, two units, then type a value in any of the boxes above.
To use this Kilometers to miles calculator, simply type the value in any box at left or at right. It accepts fractional values.
Using this converter you can get answers to questions like:
- How many miles are in 21 kilometers.?
- 21 kilometers is equal to how many miles?
- How to convert kilometers to miles?
- What is the km to in conversion factor?
- What is the formula to convert from km to in? among others.
Definition of kilometer
A kilometer (abbreviation km), a unit of length, is a common measure of distance equal to 1000 meters and is equivalent to 0.621371192 mile or 3280.8398950131 feet.
Definition of mile
A mile is a unit of length in a number of systems of measurement, including in the US Customary Units and British Imperial Units. The international mile is precisely equal to 1.609344 km (which is 25146⁄15625 km or 1 9521⁄15625 km in fraction).
Kilometer to miles formula and conversion factor
To calculate a kilometer value to the corresponding value in miles, just multiply the quantity in kilometers by 0.621371192 (the conversion factor).
Kilometer to mile formulaMiles = Kilometers * 0.621371192
Miles to Kilometers formula and conversion factor
To calculate a mile value to the corresponding value in kilometers, just multiply the quantity in miles by 1.609344 (the conversion factor).