Quick Answer: Miles to Kilometers
One mile is approximately 1.609 kilometers (1 mi ≈ 1.609 km).
Conversely, 1 km ≈ 0.6214 mi.
Formula: km = mi × 1.609344
Worked examples
- 1 mi ≈ 1.609 km
- 2 mi ≈ 3.219 km
- 3 mi ≈ 4.828 km
Method and limitations
Multiply miles by 1.609344. The international (statute) mile is 5,280 ft × 0.3048 m = 1,609.344 m exactly. 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
Multiply miles by 1.609344. The international (statute) mile is 5,280 ft × 0.3048 m = 1,609.344 m exactly.
Complete Guide to Miles to Kilometers Conversion
What is a mile?
The international statute mile (mi) is 5,280 ft or 1,760 yd, exactly 1,609.344 m.
What is a kilometer?
The kilometer (km) is 1,000 meters.
How the Conversion Works
km = mi × 1.609344. Road distances are rarely known to better than 0.1 mi, so one decimal place in km is usually enough.
Step-by-Step Conversion Guide
Follow these steps to convert miles to kilometers manually:
Start with your value in miles
Example: You want to convert 3 mi
Apply the conversion formula
Use the formula: km = mi × 1.609344
Calculate the result
3 mi = 4.828 km
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
Multiply by 1.6: 50 mi ≈ 80 km (exact 80.47 km). Consecutive Fibonacci numbers also work: 5 mi ≈ 8 km, 8 mi ≈ 13 km.
Common Conversions
| Miles (mi) | Kilometers (km) | Kilometers → Miles |
|---|---|---|
| 1 mi | 1.60934 | 1 km = 0.621371 mi |
| 2 mi | 3.21869 | 2 km = 1.24274 mi |
| 3 mi | 4.82803 | 3 km = 1.86411 mi |
| 5 mi | 8.04672 | 5 km = 3.10686 mi |
| 10 mi | 16.0934 | 10 km = 6.21371 mi |
| 20 mi | 32.1869 | 20 km = 12.4274 mi |
| 26.2 mi | 42.1648 | 26.2 km = 16.2799 mi |
| 50 mi | 80.4672 | 50 km = 31.0686 mi |
| 100 mi | 160.934 | 100 km = 62.1371 mi |
| 500 mi | 804.672 | 500 km = 310.686 mi |
| 1000 mi | 1,609.34 | 1000 km = 621.371 mi |
Popular Miles to Kilometers Conversions
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When You'll Need This Conversion
US and UK road distances
Turn a route or signpost distance in miles into kilometers for a metric map or itinerary.
Mile-based training plans
Express mile splits or distances in kilometers.
Common Mistakes to Avoid
Using the nautical mile
Nautical miles (1.852 km) are 15% longer than statute miles.
Road distances use 1 mi = 1.609344 km.
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.