Convert Kilometers to Miles Online
Kilometers and miles are the two most common units for measuring distances and speeds in everyday life. Most countries use kilometers, while the United States, United Kingdom (for road distances), and a few others use miles. Converting between them is necessary when reading maps from other regions, understanding vehicle speed limits while traveling, interpreting running or cycling distances from international events, or working with GPS data. The exact conversion factor is 1 kilometer = 0.621371 miles. This tool converts any kilometer value to miles instantly, with enough decimal precision for navigation, sports tracking, and engineering purposes. It also displays the conversion formula for reference.
Millimeters (mm)
Centimeters (cm)
Meters (m)
Kilometers (km)
Inches (in)
Feet (ft)
Yards (yd)
Miles (mi)
FAQ
- How many miles is 1 kilometer?
- 1 kilometer equals approximately 0.621371 miles. Conversely, 1 mile equals approximately 1.60934 kilometers.
- Is the km to miles conversion exact?
- Since 1959, one international mile is defined as exactly 1,609.344 meters, making the conversion factor exact: 1 km = 1000/1609.344 miles = 0.62137119... miles.
- How do I convert km/h to mph?
- The same conversion factor applies to speeds. Multiply km/h by 0.621371 to get mph. For example, 100 km/h ≈ 62.1 mph.