Quick Answer: Kilometers to Miles
One kilometer equals 0.621371192 miles (1 km = 0.621371192 mi).
Conversely, 1 mi = 1.609344 km.
Formula: mi = km ÷ 1.609344
Worked examples
- 1 km = 0.621371192 mi
- 2 km = 1.24274238 mi
- 5 km = 3.10685596 mi
Method and limitations
To convert kilometers to miles, multiply the kilometer value by 0.6213711922. This gives you the equivalent distance in miles. Calculations use full-precision constants; displayed values are rounded to at most 9 significant figures. Results are rounded for display only. Full precision is kept internally, so long chains of conversions do not accumulate rounding error. Where US customary and imperial units share a name (for example fluid ounces and gallons), this page uses the US customary definition and says so explicitly.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
To convert kilometers to miles, multiply the kilometer value by 0.6213711922. 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 0.6213711922 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 ÷ 1.609344
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 0.6213711922. This gives you the equivalent distance in miles.
Common Conversions
| Kilometers (km) | Miles (mi) | Miles → Kilometers |
|---|---|---|
| 1 km | 0.621371 | 1 mi = 1.60934 km |
| 2 km | 1.24274 | 2 mi = 3.21869 km |
| 5 km | 3.10686 | 5 mi = 8.04672 km |
| 10 km | 6.21371 | 10 mi = 16.0934 km |
| 20 km | 12.4274 | 20 mi = 32.1869 km |
| 42.2 km | 26.2219 | 42.2 mi = 67.9143 km |
| 50 km | 31.0686 | 50 mi = 80.4672 km |
| 100 km | 62.1371 | 100 mi = 160.934 km |
| 500 km | 310.686 | 500 mi = 804.672 km |
| 1000 km | 621.371 | 1000 mi = 1,609.34 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
Tap any value to load it into the calculator above.
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 0.6213711922. 40 km × 5/8 = 25 miles (actual: 24.85 mi).
Frequently Asked Questions
Related Guides & Articles
View allHow to Convert Kilometers to Miles
Converting kilometers to miles is essential for travelers, runners, and anyone dealing with both met...
How to Convert Miles to Kilometers
Whether you're planning a road trip abroad or converting race distances, knowing how to convert mile...
Essential Unit Conversions for International Travel
Traveling abroad means encountering different measurement systems. From understanding weather foreca...
Metric vs Imperial: The Complete Guide to Measurement Systems
The world is divided between two major measurement systems: metric and imperial. Understanding the d...
Want to learn more about length conversions?
Browse all length articles →People Also Convert
Related calculators users frequently visit alongside kilometers to miles.
Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.