# Kilometres

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.

Conversion Formulae

The conversion formula for kilometres (km) to miles (mi) conversions is as follows:

• 1 kilometre = 0.62137119 miles

The conversion formula for miles (mi) to kilometres (km) conversions is as follows:

• 1 mile = 1.609344 kilometres
Kilometres

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

### Definition

The kilometre is defined as one thousand metres.

Metre

### Abbreviation

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.

### Information

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.

Wikipedia: Kilometre

BIPM: SI Standard Prefixes

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.

### Conversion Formulae

• 1 kilometre = 1,000,000,000 micrometres
• 1 kilometre = 1,000,000 millimetres
• 1 kilometre = 100,000 centimetres
• 1 kilometre = 10,000 decimetres
• 1 kilometre = 1,000 metres
• 1 kilometre = 100 decametres
• 1 kilometre = 10 hectometres
• 1 kilometre = 0.001 megametres

• 1 micrometre = 0.000000001 kilometres
• 1 millimetre = 0.000001 kilometres
• 1 centimetre = 0.00001 kilometres
• 1 decimetre = 0.0001 kilometres
• 1 metre = 0.001 kilometres
• 1 decametre = 0.01 kilometres
• 1 hectometre = 0.1 kilometres
• 1 megametre = 1,000 kilometres
Miles

The mile is 1,760 yards and is commonly used for distances on road signs in the United States and Great Britain.

### Unit System

Imperial & US Customary

### Definition

The mile is defined as 1,760 yards.

Yard

### Abbreviation

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.

### Information

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: Mile

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.

### Conversion Formulae

• 1 mile = 63,360 inches
• 1 mile = 15,840 hands
• 1 mile = 5,280 feet
• 1 mile = 1,760 yards
• 1 mile = 80 chains
• 1 mile = 8 furlongs

Conversions accurate to 9 decimal places.

• 1 inch = 0.000015783 miles
• 1 hand = 0.000063131 miles
• 1 foot = 0.000189394 miles
• 1 yard = 0.000568182 miles
• 1 chain = 0.0125 miles
• 1 furlong = 0.125 miles

Conversions accurate to 9 decimal places.

Common Conversions km to mi
 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
Common Conversions mi to km
 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