km to mile Converter - Kilometer to Mile
Kilometer (km) to Mile (mi) (mile)
Direct answer
1 km = 0.621371192237 mile
mile = km × 0.621371192237
Converter
Conversion formula
mile = km × 0.621371192237
km = mile × 1.609344
Example: 10 km = 10 × 0.621371192237 = 6.21371192237 mile.
Common conversion table
| km | mile |
|---|---|
| 1 km | 0.621371192237 mile |
| 2 km | 1.24274238447 mile |
| 5 km | 3.10685596119 mile |
| 10 km | 6.21371192237 mile |
| 20 km | 12.4274238447 mile |
| 50 km | 31.0685596119 mile |
| 100 km | 62.1371192237 mile |
| 1,000 km | 621.371192237 mile |
Conversion derivation
Express both km and mile in the same base unit m (meter), then cancel the shared base unit.
- 1
Rewrite km in the base unit
- 2
Rewrite mile in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Kilometer to Mile Conversion Factor Explanation
The conversion factor between kilometers and miles is derived from their definitions in meters, the SI base unit for length.
Definition
A kilometer (km) is defined as 1,000 meters, while a mile (international mile) is defined as exactly 1,609.344 meters.
Principle
The factor is calculated by expressing both units in meters and then taking their ratio, canceling the base unit. This yields a fixed, exact relationship because both units have precise definitions.
Assumptions
- The kilometer is defined as exactly 1,000 meters.
- The mile is defined as exactly 1,609.344 meters.
- The meter is the common base unit for both conversions.
Cautions
- The factor is exact only for these standard definitions. Historical or regional variations of a mile could yield different results.
- The derived factor is for the international mile. Do not use for other mile units (e.g., survey mile) without checking.
- Rounding should only be applied to the final calculated result, not to the exact conversion factor itself during intermediate steps.
FAQ
How many mile are in 1 km?
1 km = 0.621371192237 mile.
How many mile are in 10 km?
10 km = 6.21371192237 mile.
How many mile are in 100 km?
100 km = 62.1371192237 mile.
What is the formula to convert km to mile?
Use mile = km × 0.621371192237.
How many km are in 1 mile?
1 mile = 1.609344 km.
What should I check when converting km to mile?
Use the conversion factor and round the result to the precision required by your calculation.