Kilometers to miles converter
This kilometers to miles converter divides kilometers by 1.609344, because one international mile is exactly 1.609344 km. It opens on 1 kilometer, which is 0.6213711922 miles at the default 10 significant digits. Change the distance and select Convert, and the conversion runs in your browser.
Your result
Results use the displayed unit definitions. Copy copies the value; Download includes units, definitions and rounding notes.
Kilometers to miles table
Each mile value below is what the converter returns for that distance at 10 significant digits, since the table was built with the converter's own code. Round kilometer distances are rarely round in miles, because the mile is 1.609344 km: 5 km is 3.106855961 miles, and 100 km is 62.13711922 miles.
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 | 0.6213711922 |
| 2 | 1.242742384 |
| 3 | 1.864113577 |
| 5 | 3.106855961 |
| 8 | 4.970969538 |
| 10 | 6.213711922 |
| 15 | 9.320567884 |
| 20 | 12.42742384 |
| 25 | 15.53427981 |
| 30 | 18.64113577 |
| 40 | 24.85484769 |
| 50 | 31.06855961 |
| 80 | 49.70969538 |
| 100 | 62.13711922 |
| 160 | 99.41939076 |
| 200 | 124.2742384 |
| 500 | 310.6855961 |
| 1000 | 621.3711922 |
The 8 km row comes close to 5 miles and the 160 km row close to 100 miles. For a distance that is not listed, type it into the converter above. The same factor applies to speeds, so 100 km/h is 62.13711922 mph.
Kilometers to miles formula
To change kilometers into miles, divide by 1.609344. That divisor is exact: the converter's mile is 1609.344 meters, which is 5,280 feet of 0.3048 m each, and its kilometer is 1000 meters. Multiplying by 0.6213711922 gives nearly the same result, but that factor is rounded.
- Kilometers to miles miles = kilometers ÷ 1.609344 Example: 10 km = 6.213711922 mi.
- Miles to kilometers kilometers = miles × 1.609344 Example: 3 mi = 4.828032 km.
For a mental estimate, multiply kilometers by 0.62 or by 5/8. The first gives 6.2 miles for 10 km, and the second gives 6.25 miles, against the exact 6.213711922. So 0.62 runs under a quarter of a percent low, and 5/8 about 0.6 percent high. The swap button (⇄) runs the second formula on this page, and miles to kilometers is a plain multiplication, so 3 miles gives 4.828032 km with no rounding.
How to convert km to miles here
The converter opens with Length as the Measurement family, Kilometer (km) in From, Mile (mi) in To and 1 in Value or size. Replace the 1 with your distance.
- Type the distance in kilometers in Value or size, such as 21.1. Use a dot for decimals and leave out commas.
- Keep Kilometer (km) and Mile (mi). Nautical mile (nmi) and Meter (m) are in the same menus, and the swap button (⇄) turns the pair into miles to kilometers.
- Choose 6, 10 or 15 significant digits in Display precision; 10 is selected when the page opens.
- Select Convert or press Enter. Converted value shows the miles, with a line such as 1 Kilometer = 0.6213711922 Mile.
- Copy result copies the number, and Download text saves it with the unit definition note. Reset goes back to 1 kilometer to miles.
Limits
The mile on this page is the international mile of 1,609.344 meters. The older US survey mile is not in the menu, and the nautical mile of 1,852 meters is a separate entry: 1 km is 0.5399568035 nautical miles. Speed is its own family, so km/h to mph is not a Length conversion.
The result is a decimal in one unit. There is no pace output, such as minutes per mile, and no miles-and-yards format. The converter handles one distance per conversion; use the table above for a quick look at several. Values need a dot for decimals, and a comma, as in 1,000, returns an error.
Negative distances convert too, so -1.609344 km gives -1 mile. Large distances switch to e notation: 1e22 km shows as 6.213711922e+21 miles. For short distances, Meter (m) and Foot (international) are in the same Length menus.
Questions
How do you convert km to miles?
Divide the kilometers by 1.609344. For example, 42.195 km ÷ 1.609344 is 26.21875746 miles, and 21.1 km is 13.11093216 miles. To go back, multiply miles by 1.609344. This page does the division for you: type the distance, keep Kilometer (km) and Mile (mi), and select Convert.
Is 3 km longer than 1 mile?
Yes. Three kilometers is 1.864113577 miles, so it is longer than a mile by about 0.86 miles. One mile is 1.609344 km, which means any distance over 1.609344 km is longer than a mile. Two kilometers, at 1.242742384 miles, is also longer.
Does 5 km equal 3 miles?
Close, but not exactly. Five kilometers is 3.106855961 miles, about a tenth of a mile more than 3. Three miles is 4.828032 km. So a 5 km route is slightly longer than a 3 mile route, by about 0.17 km or 0.11 miles.
Which is longer, 10 miles or 10 kilometers?
Ten miles is longer. It is 16.09344 km, while 10 km is only 6.213711922 miles. A mile is about 1.6 times a kilometer, so the same number in miles is always the longer distance. Swap the units on this page to convert 10 miles to kilometers.
What speed is 70 km/h in mph?
70 km/h is 43.49598346 mph. Speed is a separate family in this converter: choose Speed under Measurement family, then Kilometre per hour (km/h) in From and Miles per hour (mph) in To. The factor is the same 1.609344, because a mile per hour is 1.609344 km per hour.