Quick Answer: Kilometers to Miles
One kilometer is approximately 0.6214 miles (1 km ≈ 0.6214 mi).
Conversely, 1 mi ≈ 1.609 km.
Formula: mi = km ÷ 1.609344
Worked examples
- 1 km ≈ 0.6214 mi
- 2 km ≈ 1.243 mi
- 5 km ≈ 3.107 mi
Method and limitations
Divide kilometers by 1.609344 (equivalently, multiply by about 0.621371). The mile is exactly 1.609344 km, so the factor is derived from an exact definition. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
Divide kilometers by 1.609344 (equivalently, multiply by about 0.621371). The mile is exactly 1.609344 km, so the factor is derived from an exact definition.
Complete Guide to Kilometers to Miles Conversion
What is a kilometer?
The kilometer (km) is 1,000 meters, the usual unit for road distance outside the US and UK.
What is a mile?
The international statute mile (mi) is exactly 1.609344 km.
How the Conversion Works
mi = km ÷ 1.609344.
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
Multiply by 6 and divide by 10: 100 km ≈ 60 mi (exact 62.14 mi). Using 5/8 is closer: 80 km × 5/8 = 50 mi (exact 49.71).
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 |
Popular Kilometers to Miles Conversions
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When You'll Need This Conversion
Metric road signs and routes
Read a European or other metric route distance in miles.
Odometer readings
Compare a vehicle odometer in km with mileage figures quoted in miles.
Common Mistakes to Avoid
Multiplying by 1.609344
A mile is longer than a kilometer, so the mile figure must be smaller.
100 km ÷ 1.609344 = 62.14 mi.
Frequently Asked Questions
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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.