Miles ⇄ Km Converter
Enter a value in either field to convert instantly.
1 mi = 1.609344 km · 1 km = 0.621371 mi
Miles to Km Converter: Convert Miles to Kilometers Instantly
Use the calculator above to convert miles to km in real time — just type a value and get an accurate result instantly. Whether you're converting a single mile or working out miles to kilometers for a road trip, race distance, or school assignment, this mi to km converter handles it with full decimal precision.
What Is a Mile?
A mile is a unit of length used primarily in the United States and the United Kingdom for measuring road distances, speed limits, and everyday travel. One international mile is defined as exactly 1.609344 kilometers, 5,280 feet, or 1,760 yards. It's part of the imperial measurement system, which is why you'll mostly see miles used on US and UK highway signs rather than in countries that use the metric system.
What Is a Kilometer?
A kilometer is the metric unit of distance equal to 1,000 meters, and it's the standard used for road distances, race lengths, and everyday measurements in most of the world outside the US and UK. Because the metric system is based on powers of ten, kilometers are simpler to scale up or down compared to miles, which is one reason most countries adopted it as their default distance unit.
Miles to Km Formula
The conversion is a simple multiplication:
kilometers = miles × 1.609344
To go the other direction, divide by 1.609344 (or multiply by approximately 0.621371) to convert km back to miles.
Example Calculation
Convert 8 miles to km:
8 × 1.609344 = 12.87 km
Miles to Km Conversion Table
| Miles | Kilometers |
|---|---|
| 1 mi | 1.61 km |
| 5 mi | 8.05 km |
| 10 mi | 16.09 km |
| 15 mi | 24.14 km |
| 20 mi | 32.19 km |
| 25 mi | 40.23 km |
| 30 mi | 48.28 km |
| 40 mi | 64.37 km |
| 50 mi | 80.47 km |
| 60 mi | 96.56 km |
| 70 mi | 112.65 km |
| 80 mi | 128.75 km |
| 90 mi | 144.84 km |
| 100 mi | 160.93 km |
Common Real-World Miles to Kilometers Conversions
Distance conversions show up most often around running, driving, and speed — here are some you'll likely search for:
| Common Distance | In Miles | In Kilometers |
|---|---|---|
| 5K race | 3.11 mi | 5 km |
| 10K race | 6.21 mi | 10 km |
| Half marathon | 13.11 mi | 21.10 km |
| Marathon | 26.22 mi | 42.195 km |
| US highway speed limit | 65 mph | 104.61 km/h |
| US highway speed limit | 70 mph | 112.65 km/h |
| Typical commute | 15 mi | 24.14 km |
How to Convert Miles to Km Manually
- Take the distance in miles.
- Multiply it by 1.609344.
- The result is the equivalent distance in kilometers.
For quick mental math, multiplying by 1.6 instead of 1.609344 gets you within about 0.6% of the exact answer — close enough for casual estimates like trip planning, though the calculator above gives you the precise figure when it matters.
Related Tools
How many km are in a mile?
There are 1.609344 kilometers in one mile, commonly rounded to 1.61 km.
How do I convert miles to km?
Multiply the number of miles by 1.609344 to get the equivalent in kilometers.
What is the difference between a mile and a kilometer?
A mile is an imperial unit of length used mainly in the US and UK, while a kilometer is a metric unit used in most other countries. A mile is longer than a kilometer — about 1.61 times the distance.
How many miles is a marathon in km?
A standard marathon is 26.2 miles, which is 42.195 kilometers.
Is 1 mile longer than 1 km?
Yes. One mile equals 1.609344 km, so a mile is significantly longer than a kilometer.
How do I convert km back to miles?
Divide the kilometer value by 1.609344, or multiply it by approximately 0.621371.
What's a fast way to estimate miles to km without a calculator?
Multiply the mile value by 1.6 for a close approximation — accurate to within about 0.6%.