Enter the value to convert into the box and modify the accuracy of the conversion by selecting number of significant figures or decimal places by clicking on the boxes provided.
The conversion formula for kilometres (km) to miles (mi) conversions is as follows:
The conversion formula for miles (mi) to kilometres (km) conversions is as follows:
The kilometre is a unit of length of 1000 metres and is used for distances on road signs in countries where the metric system is in use.
SI Metric
The kilometre is defined as one thousand metres.
Metre
Formal: km
The abbreviation is sometimes capitalised as KM or Km and occasionally is seen as kms for more than one kilometre, all of these are technically incorrect.
The kilometre is an SI metric unit of length with the standard SI prefix milli indicating that it is 103 metres.
The kilometre is one of the most commonly seen measurements as it is used for distances on road signs in the vast majority of countries in the world. It is also used in kilometres per hour for speeds.
Kilometres are used worldwide where the metric system has been adopted, the United Kingdom has adopted the metric system but still has not replaced miles on road signs with kilometres despite having planned to do so from 1970.
The mile is 1,760 yards and is commonly used for distances on road signs in the United States and Great Britain.
Imperial & US Customary
The mile is defined as 1,760 yards.
Yard
Formal: mi
The abbreviation m is still used on British road signs, despite this abbreviation being the same as that for metres in the SI metric system, which could cause confusion to visitors from outside the UK.
The English mile has it roots in the Roman mile (mille passus or mille passuum) which was 1,000 paces long. A roman pace being the distance travelled in two steps one off the left foot and one off the right, so that it was the distance between two landing points of the same foot. The Roman mile was standardised at 5,000 Roman feet.
Roman miles would have been in use in England, following the Roman invasion and the Romans used mile stones on their roads. The fact that some of these roads are still in use today would suggest that many of the milestones lasted until the English mile came into being sometime in the early medieval period. The English mile was still taken as being 5,000ft at this time.
In 1593 the British parliament, then under the auspices of Elizabeth I, passed a Weights and Measures Act that effectively defined the mile in terms of the standard yard. The formal definition in the act stated that the mile shall be 8 furlongs, every furlong 40 poles and every pole shall contain 16 foot and a half. Thus the mile became defined as 5,280 feet in length, given that the foot at the time was defined as one third of a yard, the definition of the mile became dependent on that of the yard.
Wikipedia: UK Weights and Measures Acts
Miles are a standard unit of length in the United States and Liberia and are still used in the United Kingdom for road signs and informally other British Commonwealth countries that formerly used Imperial units as standard.
Conversions accurate to 9 decimal places.
Conversions accurate to 9 decimal places.
| km | mi |
| 1 | 0.62 |
| 2 | 1.24 |
| 3 | 1.86 |
| 4 | 2.49 |
| 5 | 3.11 |
| 6 | 3.73 |
| 7 | 4.35 |
| 8 | 4.97 |
| 9 | 5.59 |
| 10 | 6.21 |
| km | mi |
| 10 | 6.21 |
| 20 | 12.43 |
| 30 | 18.64 |
| 40 | 24.85 |
| 50 | 31.07 |
| 60 | 37.28 |
| 70 | 43.50 |
| 80 | 49.71 |
| 90 | 55.92 |
| 100 | 62.14 |
| km | mi |
| 100 | 62.14 |
| 200 | 124.27 |
| 300 | 186.41 |
| 400 | 248.55 |
| 500 | 310.69 |
| 600 | 372.82 |
| 700 | 434.96 |
| 800 | 497.10 |
| 900 | 559.23 |
| 1,000 | 621.37 |
| mi | km |
| 1 | 1.61 |
| 2 | 3.22 |
| 3 | 4.83 |
| 4 | 6.44 |
| 5 | 8.05 |
| 6 | 9.66 |
| 7 | 11.27 |
| 8 | 12.87 |
| 9 | 14.48 |
| 10 | 16.09 |
| mi | km |
| 10 | 16.09 |
| 20 | 32.19 |
| 30 | 48.28 |
| 40 | 64.37 |
| 50 | 80.47 |
| 60 | 96.56 |
| 70 | 112.65 |
| 80 | 128.75 |
| 90 | 144.84 |
| 100 | 160.93 |
| mi | km |
| 100 | 160.93 |
| 200 | 321.87 |
| 300 | 482.80 |
| 400 | 643.74 |
| 500 | 804.67 |
| 600 | 965.61 |
| 700 | 1,126.54 |
| 800 | 1,287.48 |
| 900 | 1,448.41 |
| 1,000 | 1,609.34 |