How to convert kilometers to miles
To convert a measurement in kilometers to miles, multiply the value by 0.6213711922. The conversion factor comes from the relationship between both units and the meter (the SI base unit of length).
For example, to convert 5 km to miles: 5 × 0.6213711922 = 3.106856 mi.
What is a kilometer?
A kilometer is a metric unit of length equal to 1,000 meters or approximately 0.621 miles. The kilometer was introduced with the metric system in France in 1795, derived from the Greek 'khilioi' (thousand) and 'metron' (measure). It became the standard unit for measuring road distances in most countries.
Common uses of kilometers include: Road distances and speed limits in most countries; Running events (5K, 10K, marathon distances); Geographic distances between cities; Aviation altitude reporting in some regions.
What is a mile?
A mile is an imperial unit of length equal to 5,280 feet, 1,760 yards, or exactly 1,609.344 meters. Derived from the Roman 'mille passus' (a thousand paces), originally 5,000 Roman feet. The statute mile of 5,280 feet was established by English Parliament in 1593 and standardized internationally in 1959.
Common uses of miles include: Road distances and speed limits in the US, UK, and Myanmar; Vehicle odometer readings in imperial countries; Running and fitness tracking (mile splits); Property and real estate distance descriptions.
When you need to convert kilometers to miles
Travelers driving between metric and imperial countries need this conversion for understanding speed limits and road signs. If a sign reads 100 km, knowing it equals about 62 miles helps you gauge the distance.
Kilometers to miles worked examples
Here are some common values converted:
1 km = 0.6213711922 mi 5 km = 3.106856 mi 10 km = 6.213712 mi 50 km = 31.06856 mi 100 km = 62.137119 mi
Frequently asked questions
How many miles are in one kilometer?
One kilometer (km) equals 0.6213711922 miles (mi). Multiply any value in kilometers by 0.6213711922 to convert to miles.
How do I convert kilometers to miles?
Multiply the value in kilometers by 0.6213711922. For example, 5 km × 0.6213711922 = 3.106856 mi.
How do I convert miles to kilometers?
Multiply the value in miles by 1.609344, or divide by 0.6213711922. Use the swap button on the converter above to reverse the direction.
Is the kilometer to mile conversion exact?
Yes, the conversion is exact. Since 1959, one inch is defined as exactly 25.4 mm (the international yard and pound agreement), so all metric-imperial length conversions use exact factors.
What is the formula for kilometers to miles?
The formula is: mi = km × 0.6213711922. This is derived from the definition of both units relative to the meter (the SI base unit of length).