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Convert between miles, kilometers, meters, feet, yards, and inches with quick reference tables.
Length and distance conversion is the process of converting measurements between imperial units (miles, feet, inches) and metric units (kilometers, meters) using standardized conversion factors.
Formula
km = miles × 1.6093441.609344 = exact international definition: 1 mile = 1,609.344 meters
miles = statute miles (the common land mile used in the US/UK)
km = kilometers (the SI unit of length for distances)
Worked Example
A 5K race converted to miles
Did you know? The mile originates from the Roman 'mille passus' (thousand paces), where a legionary's double-step equaled about 1.48 m. The modern international mile was standardized to exactly 1,609.344 meters in 1959 by agreement between English-speaking nations.
Sources
| Miles | Kilometers | Common Use |
|---|---|---|
| 1 mi | 1.609 km | - |
| 5 mi | 8.047 km | 5K ≈ 3.1 mi |
| 10 mi | 16.093 km | 10K ≈ 6.2 mi |
| 13.1 mi | 21.097 km | Half Marathon |
| 26.2 mi | 42.195 km | Marathon |
| 50 mi | 80.467 km | - |
| 100 mi | 160.934 km | - |
Multiply the number of miles by 1.609344 to get kilometers.
km = miles × 1.609344
Multiply the number of kilometers by 0.621371 to get miles.
miles = km × 0.621371
For rough estimates: 5 miles ≈ 8 km, or multiply km by 0.6 to get miles.
Formula
1 mile = 1.609344 km | 1 foot = 0.3048 m | 1 inch = 25.4 mmmile = International mile — exactly 1,609.344 metres (SI)
foot = International foot — exactly 0.3048 metres (SI)
inch = Exactly 25.4 millimetres; 12 inches = 1 foot
Worked Example
Convert 5 miles to kilometres
Did you know? The metre was originally defined in 1793 as one ten-millionth of the distance from the Earth's equator to the North Pole. Today it is defined by the speed of light: 1 m is the distance light travels in 1/299,792,458 of a second.
Sources
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