Conversion Formula
To convert kilometers to miles, multiply the kilometer value by 0.621371. This gives you the equivalent distance in miles.
Complete Guide to Kilometers to Miles Conversion
What is a Kilometers?
A kilometer (km) is a metric unit of length equal to 1,000 meters. It is used worldwide for measuring distances between places, vehicle odometers, and race courses.
What is a Miles?
A mile (mi) is an imperial unit equal to 1,609.344 meters or 5,280 feet. It is used for road distances in the US, UK, and a few other countries.
How the Conversion Works
Multiplying by 0.621371 converts kilometers to miles because one kilometer equals exactly 1/1.609344 miles.
Why This Conversion Matters
This conversion helps when using American products, apps, or communicating with people in the US about distances, speeds, and travel plans.
Step-by-Step Conversion Guide
Follow these steps to convert kilometers to miles manually:
Start with your value in kilometers
Example: You want to convert 5 km
Apply the conversion formula
Use the formula: mi = km × 0.621371
Calculate the result
5 km = 3.1069 mi
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
To convert kilometers to miles, multiply the kilometer value by 0.621371. This gives you the equivalent distance in miles.
Common Conversions
| Kilometers (km) | Miles (mi) | Miles → Kilometers |
|---|---|---|
| 1 km | 0.6214 | 1 mi = 1.6093 km |
| 2 km | 1.2427 | 2 mi = 3.2187 km |
| 5 km | 3.1069 | 5 mi = 8.0467 km |
| 10 km | 6.2137 | 10 mi = 16.0934 km |
| 20 km | 12.4274 | 20 mi = 32.1869 km |
| 42.2 | 26.2219 | 42.2 mi = 67.9143 km |
| 50 km | 31.0686 | 50 mi = 80.4672 km |
| 100 km | 62.1371 | 100 mi = 160.9344 km |
| 500 | 310.6855 | 500 mi = 804.6722 km |
| 1000 | 621.371 | 1000 mi = 1609.3445 km |
Did You Know?
The kilometers and miles are among the most commonly converted units worldwide, with millions of daily searches.
This converter is used by thousands of people daily for quick reference. Bookmark it for instant access.
Popular Kilometers to Miles Conversions
When You'll Need This Conversion
Race Distances
Convert 5K, 10K, half marathon (21.1 km), and marathon (42.2 km) distances to miles.
US Travel Planning
Convert distances to miles when planning road trips in the United States.
Vehicle Odometer
Convert odometer readings when buying or selling cars between metric and imperial countries.
Pro Tips for Accurate Conversions
Multiply by 0.6 for quick estimates
This gives results within 3% accuracy. 100 km × 0.6 = 60 mi (actual: 62.14 mi).
Use the 5/8 fraction
5/8 (0.625) is very close to 0.621371. 40 km × 5/8 = 25 miles (actual: 24.85 mi).
Frequently Asked Questions
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Last verified: April 2026. All conversion factors are based on internationally defined standards.