Miles to km converter
One mile is exactly 1.609344 kilometers. To convert miles to km, multiply the number of miles by 1.609344.
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26.2 miles =
42.1648km
Formula: km = mi × 1.609344
Show the steps
- Definition: 1 mi = 1609.344 m exactly (5280 ft); 1 km = 1000 m (SI prefix kilo)
- 26.2 mi × 1.609344 = 42.1648 km
Definitions used: 1 mi = 1609.344 m exactly (5280 ft); 1 km = 1000 m (SI prefix kilo).
Source: NIST SP 811, Appendix B.8, checked on .
How to convert miles to kilometers
Multiply the value in miles by 1.609344. The factor follows from the definitions: 1 mi = 1609.344 m exactly (5280 ft), and 1 km = 1000 m (SI prefix kilo).
km = mi × 1.609344
Worked example: 26.2 mi to km
- Definition: 1 mi = 1609.344 m exactly (5280 ft); 1 km = 1000 m (SI prefix kilo)
- 26.2 mi × 1.609344 = 42.1648 km
- Answer: 26.2 mi = 42.1648 km.
Miles to kilometers chart
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 | 1.60934 |
| 2 | 3.21869 |
| 3 | 4.82803 |
| 3.1 | 4.98897 |
| 5 | 8.04672 |
| 6.2 | 9.97793 |
| 10 | 16.0934 |
| 13.1 | 21.0824 |
| 15 | 24.1402 |
| 20 | 32.1869 |
| Miles (mi) | Kilometers (km) |
|---|---|
| 26.2 | 42.1648 |
| 30 | 48.2803 |
| 50 | 80.4672 |
| 60 | 96.5606 |
| 70 | 112.654 |
| 100 | 160.934 |
| 200 | 321.869 |
| 300 | 482.803 |
| 500 | 804.672 |
| 1,000 | 1,609.34 |
Values rounded to 6 significant digits. Type any other number in the converter at the top of the page.
How many km is a marathon of 26.2 miles?
26.2 miles is 42.165 km. The official marathon distance is 42.195 km, which is 26 miles 385 yards. A half marathon of 13.1 miles is 21.082 km.
What is the quick way to turn miles into km?
Multiply by 8 and divide by 5. 50 miles × 8 ÷ 5 = 80 km; the exact value is 80.467 km. The shortcut is only 0.6% low, close enough for road signs.
More questions about miles and kilometers
How many km is 1 mile?
Exactly 1.609344 km, because the mile is 5,280 feet and the foot is exactly 0.3048 m.
How many km is 10 miles?
10 miles is 16.0934 km.
How many km is 100 miles?
100 miles is 160.934 km.
How do I convert miles per hour to km per hour?
The factor is the same, 1.609344. 60 mph is 96.56 km/h. The mph to km/h page has a speed-limit table.
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Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.