Convert km to miles
PrintKilometer to Mile Conversion Table
| Kilometer (km) | Mile (mi) |
|---|---|
| 0.01 km | 0.0062137119 mi |
| 0.1 km | 0.0621371192 mi |
| 1 km | 0.6213711922 mi |
| 2 km | 1.2427423845 mi |
| 3 km | 1.8641135767 mi |
| 5 km | 3.1068559612 mi |
| 10 km | 6.2137119224 mi |
| 20 km | 12.4274238447 mi |
| 50 km | 31.0685596119 mi |
| 100 km | 62.1371192237 mi |
| 1000 km | 621.3711922373 mi |
Kilometers and miles are the two most widely used units for measuring land distance worldwide. While the kilometer (km) is the official International System of Units (SI) standard used across Continental Europe, Asia, Latin America, and Canada, the international mile (mi) remains the primary road distance unit in the United States, the United Kingdom, Myanmar, and Liberia.
Our free online Km to Miles Converter provides instant, highly accurate conversions in both directions:
- Kilometers to Miles: Multiply kilometers by
0.62137119(or divide by1.609344). - Miles to Kilometers: Multiply miles by
1.609344(exact international standard).
Exact Conversion Formulas: Km & Miles
Since the International Yard and Pound Agreement of 1959, the international mile is defined as exactly 1,609.344 meters. This establishes exact mathematical relationships:
| Conversion Direction | Exact Mathematical Formula | Quick Mental Approximation Rule |
|---|---|---|
| Kilometers to Miles | Miles = Kilometers × 0.6213711922 |
Multiply km by 6 and divide by 10 (e.g., 10 km × 0.6 = 6 miles). |
| Miles to Kilometers | Kilometers = Miles × 1.609344 |
Multiply miles by 1.6 (e.g., 10 miles × 1.6 = 16 km). |
Step-by-Step Calculation Example
To convert 15 kilometers to miles:
15 km × 0.6213711922 = 9.320568 miles
Thus, driving 15 kilometers is equivalent to approximately 9.32 miles.
Kilometer to Mile Conversion Table
Below is a handy reference table for quick distance conversions from 0.01 km up to 1,000 km:
| Distance in Kilometers (km) | Exact Equivalent in Miles (mi) | Rounded Equivalent (2 Decimals) |
|---|---|---|
| 0.01 km | 0.00621371 mi | 0.01 mi |
| 0.1 km | 0.06213712 mi | 0.06 mi |
| 1.0 km | 0.62137119 mi | 0.62 mi |
| 2.0 km | 1.24274238 mi | 1.24 mi |
| 3.0 km | 1.86411358 mi | 1.86 mi |
| 5.0 km (5K Race) | 3.10685596 mi | 3.11 mi |
| 10.0 km (10K Race) | 6.21371192 mi | 6.21 mi |
| 20.0 km | 12.42742384 mi | 12.43 mi |
| 21.0975 km (Half Marathon) | 13.10937500 mi | 13.11 mi |
| 42.195 km (Full Marathon) | 26.21875000 mi | 26.22 mi |
| 50.0 km | 31.06855961 mi | 31.07 mi |
| 100.0 km | 62.13711922 mi | 62.14 mi |
| 1,000.0 km | 621.37119224 mi | 621.37 mi |
History & Origins: Kilometer vs. Mile
The Origin of the Kilometer (km)
The kilometer is derived from the meter, established in 1791 by French scientists during the French Revolution as 1/10,000,000th of the distance from the Earth’s equator to the North Pole along the Paris meridian. The prefix kilo- indicates one thousand meters (1,000 m). Today, the meter is defined with extreme precision based on the speed of light in a vacuum (1/299,792,458th of a second).
The Origin of the Mile (mi)
The English word mile originates from the Roman mille passus, meaning “one thousand double paces” (5,000 Roman feet). In 1593, during the reign of Queen Elizabeth I, the English Parliament officially redefined the statute mile as 5,280 feet (8 furlongs) to align land surveys with agricultural field measurements. Before metrication, “m” was abbreviated for miles, but “mi” became standard to prevent confusion with meters.
To convert travel speeds between mph and km/h, use our Speed Calculator. For running pace targets per mile or kilometer, visit our Pace Calculator. For general unit conversions, explore our Conversion Calculator.
Frequently Asked Questions (FAQ)
How many miles is a 5K race?
A 5K road race (5 kilometers) equals exactly 3.10686 miles (commonly rounded to 3.1 miles).
How many miles is a 10K race?
A 10K road race (10 kilometers) equals exactly 6.21371 miles (commonly rounded to 6.2 miles).
How many kilometers are in a full marathon?
An official marathon is 42.195 kilometers long, which converts to exactly 26.21875 miles (commonly stated as 26.2 miles).
Why do the US and UK still use miles instead of kilometers?
The US and UK retained miles due to deeply entrenched road infrastructure, signages, vehicle speedometers, and cultural usage. While the UK adopted the metric system for industry and commerce in the 20th century, road signs remain officially posted in miles per hour and miles.