Miles to Km Converter
Convert miles to kilometers, or kilometers to miles, with meters, feet, nautical miles and the same answer as a speed in mph and km/h.
Results
| Item | Value |
|---|
Quick Answer
Multiply miles by 1.609344 to get kilometers. 1 mile is 1.609 km, 5 miles is 8.05 km, 10 miles is 16.09 km and a 26.2 mile marathon is 42.16 km. To turn kilometers into miles, divide by 1.609344 (or multiply by 0.621371): 5 km is 3.11 mi and 10 km is 6.21 mi.
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Table of Contents
- Miles to Km Converter
- Quick Answer
- Related Calculators
- How This Miles to Km Converter Works
- How to Use the Miles to Km Converter
- Miles to Km Formulas
- Key Terms
- Worked Example
- Real-Life Examples
- Mile vs Kilometer
- Miles to Kilometers Chart
- Miles, Kilometers and Speed
- Common Mistakes to Avoid
- Frequently Asked Questions
- References & Sources
How This Miles to Km Converter Works
Race distances, road signs, car dashboards and maps switch between miles and kilometers depending on the country. Choose the direction, enter the distance and press Calculate. The converter gives the answer to three decimal places, the same number read as a speed in mph and km/h, plus meters, feet and nautical miles.
Quick explanation: a mile is about 1.6 kilometers.
- mi to km: multiply by 1.609344.
- km to mi: multiply by 0.621371 (or divide by 1.609344).
- Mental math: the Fibonacci trick works well: 3 mi ≈ 5 km, 5 mi ≈ 8 km, 8 mi ≈ 13 km.
How to Use the Miles to Km Converter
- Choose miles to kilometers or kilometers to miles.
- Enter the distance (or a speed).
- Press Calculate.
- Read the converted distance, the speed line, meters, feet and nautical miles.
Miles to Km Formulas
- Definition: 1 mile (mi) = 5,280 feet = 1.609344 kilometers exactly
- Kilometers from miles: km = mi × 1.609344
- Miles from kilometers: mi = km ÷ 1.609344 = km × 0.6213712
- Speed: km/h = mph × 1.609344, and mph = km/h × 0.6213712
- Nautical mile: 1 nmi = 1.852 km = 1.150779 mi
Key Terms
- Mile (mi): the statute or land mile, 5,280 feet or 1.609344 km.
- Kilometer (km): 1,000 meters.
- mph: miles per hour.
- km/h: kilometers per hour.
- Nautical mile (nmi): 1,852 meters, used at sea and in aviation.
Worked Example
How far is a half marathon of 13.1 miles in kilometers?
- 13.1 × 1.609344 = 21.0824 km
- Race organizers round it to 21.0975 km, half of the official 42.195 km marathon.
- In meters: 21,082 m.
Going the other way, a 10K race is 10 ÷ 1.609344 = 6.2137 miles, about 6.2 miles.
Real-Life Examples
- Running: a 5K is 3.11 mi and a marathon is 26.22 mi.
- Driving abroad: a 100 km/h limit is 62.1 mph.
- Trip planning: 300 miles is 483 km.
- Cycling: a 100 km ride is 62.1 mi, a metric century.
Mile vs Kilometer
- Mile (mi): the US and UK road unit, 5,280 ft, exactly 1.609344 km.
- Kilometer (km): 1,000 meters, used on roads in most countries.
- Size: 1 km = 0.6214 mi, so a kilometer is about five eighths of a mile.
Miles to Kilometers Chart
Exact factor: 1 mi = 1.609344 km.
| Miles | Kilometers | Speed |
|---|---|---|
| 1 mi | 1.609 km | 1 mph = 1.6 km/h |
| 2 mi | 3.219 km | 2 mph = 3.2 km/h |
| 3 mi | 4.828 km | 3 mph = 4.8 km/h |
| 5 mi | 8.047 km | 5 mph = 8.0 km/h |
| 6.2 mi | 9.978 km | 6.2 mph = 10.0 km/h |
| 10 mi | 16.093 km | 10 mph = 16.1 km/h |
| 13.1 mi | 21.082 km | 13.1 mph = 21.1 km/h |
| 20 mi | 32.187 km | 20 mph = 32.2 km/h |
| 25 mi | 40.234 km | 25 mph = 40.2 km/h |
| 26.2 mi | 42.165 km | 26.2 mph = 42.2 km/h |
| 30 mi | 48.280 km | 30 mph = 48.3 km/h |
| 50 mi | 80.467 km | 50 mph = 80.5 km/h |
| 55 mi | 88.514 km | 55 mph = 88.5 km/h |
| 65 mi | 104.607 km | 65 mph = 104.6 km/h |
| 100 mi | 160.934 km | 100 mph = 160.9 km/h |
Miles, Kilometers and Speed
The international mile has been exactly 1,609.344 meters since 1959. Because speed is distance per hour, the same factor turns miles per hour into kilometers per hour: 55 mph is 88.5 km/h, 65 mph is 104.6 km/h and 100 km/h is 62.1 mph. That is why the converter shows the speed line for every answer.
Do not confuse the land mile with the nautical mile used at sea and in the air. A nautical mile is 1,852 meters, about 15% longer than a statute mile, and a knot is one nautical mile per hour. For running and driving, the ordinary mile is the one you want. The United States and the United Kingdom still post road distances in miles, while Canada, Ireland and most of the world use kilometers, so travelers crossing those borders convert often.
Common Mistakes to Avoid
- Dividing when you should multiply. Miles become a bigger number in kilometers.
- Using 1.6 for long trips. 500 mi is 804.7 km, not 800 km.
- Mixing up nautical and land miles. A nautical mile is 1.852 km.
- Forgetting speed works the same way. 70 mph is 112.7 km/h.
- Rounding race distances. A marathon is 42.195 km, not 42 km.
Frequently Asked Questions
One mile is exactly 1.609344 km.
Multiply the miles by 1.609344.
One kilometer is 0.6214 miles.
5 miles is 8.047 km.
5 km is 3.107 miles.
10 km is 6.214 miles.
60 mph is 96.56 km/h.
A marathon is 42.195 km, or 26.219 miles.
100 km is 62.14 miles.
References & Sources
| Source | Used For | Link |
|---|---|---|
| NIST, Guide to the SI, Appendix B.8 | Mile (international) = 1.609344 km exactly; nautical mile = 1,852 m. | https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 |
| NIST Handbook 44, Appendix C: General Tables of Units of Measurement | Units of length: mile, furlong, rod and their metric equivalents. | https://www.nist.gov/pml/owm/nist-handbook-44-current-edition |