Convert miles to kilometers and kilometers to miles instantly. Free online length and distance converter with formula, examples, and reference tables.
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 | 1.609 km |
| 5 | 8.047 km |
| 10 | 16.093 km |
| 26.2 (Marathon) | 42.165 km |
| 100 | 160.934 km |
A 5-kilometer run is a popular race distance. How many miles is that?
Formula: 5 km ÷ 1.609344 = 3.107 miles
In reverse: 3.107 mi × 1.609344 = 5.000 km
5K races are one of the most common running distances worldwide, equal to about 3.1 miles.
A full marathon is 26 miles and 385 yards. How many kilometers is that?
Formula: 26.219 mi × 1.609344 = 42.195 km
In reverse: 42.195 km ÷ 1.609344 = 26.219 miles
The classic marathon distance of 42.195 km originated from the 1908 London Olympics.
Planning a 300-mile road trip. How many kilometers will you drive?
Formula: 300 mi × 1.609344 = 482.803 km
In reverse: 482.803 km ÷ 1.609344 = 300.000 miles
At 60 mph (96.6 km/h), a 300-mile trip takes about 5 hours of driving time.
Common mile values converted to kilometers using the standard conversion factor of 1 mile = 1.609344 kilometers.
| Miles (mi) | Kilometers (km) | Miles (mi) | Kilometers (km) |
|---|---|---|---|
| 0.1 | 0.161 km | 15 | 24.140 km |
| 0.25 | 0.402 km | 20 | 32.187 km |
| 0.5 | 0.805 km | 25 | 40.234 km |
| 0.621 | 1.000 km | 26.2 | 42.165 km |
| 1 | 1.609 km | 30 | 48.280 km |
| 2 | 3.219 km | 40 | 64.374 km |
| 3 | 4.828 km | 50 | 80.467 km |
| 4 | 6.437 km | 60 | 96.561 km |
| 5 | 8.047 km | 70 | 112.654 km |
| 6 | 9.656 km | 80 | 128.748 km |
| 7 | 11.265 km | 90 | 144.841 km |
| 8 | 12.875 km | 100 | 160.934 km |
| 9 | 14.484 km | 200 | 321.869 km |
| 10 | 16.093 km | 500 | 804.672 km |
Converting miles to kilometers is straightforward. The mile and kilometer are both units of length or distance. The mile is commonly used in the United States and the United Kingdom, while the kilometer is the standard unit of distance in most other countries and in scientific contexts worldwide.
The exact conversion factor is defined as: 1 mile = 1.609344 kilometers. This means that to convert any distance in miles to kilometers, you simply multiply the number of miles by 1.609344.
To convert kilometers back to miles, divide the number of kilometers by 1.609344, or equivalently, multiply by 0.621371 (the reciprocal of 1.609344).
The conversion factor 1.609344 is an exact defined value. In 1959, the international yard and pound agreement between the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa defined the international yard as exactly 0.9144 meters. Since one mile is 1,760 yards (or 1,609.344 meters), this gives us the precise conversion factor of 1.609344 kilometers per mile.
Here are some of the most frequently used mile-to-kilometer conversions:
1 mile = 1.609 km (standard walking pace ~20 min/mile). 5K run = 3.107 mi. 10K run = 6.214 mi. Marathon = 26.219 mi = 42.195 km.
Speed limits: 55 mph ≈ 88.5 km/h, 65 mph ≈ 104.6 km/h, 70 mph ≈ 112.7 km/h. A 100-mile trip ≈ 161 km.
Nautical miles differ from statute miles. 1 nautical mile = 1.852 km. International flights are often measured in nautical miles or kilometers.
US uses miles; most other countries use km. Speedometer in US cars shows mph; European cars show km/h. GPS devices can display either.