Convert Mile to Kilometer
Convert miles to kilometers instantly. 1 mile = 1.609344 kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilometer to Mile converter for the reverse conversion.
Units explained
Mile
A mile (statute mile) is an Imperial and US customary unit of length equal to 5,280 feet or exactly 1,609.344 meters. It is the standard unit for road distances in the United States and the United Kingdom.
The mile derives from the Roman mille passus ("thousand paces" — about 1,480 meters). The English statute mile was fixed at 5,280 feet by the Weights and Measures Act of 1593, and exactly defined as 1,609.344 m by the 1959 International Yard and Pound Agreement.
Miles are used in the US and UK for road signs, speed limits (mph), athletic events (one-mile run), and geographic distances. Aviation also uses statute miles for some visibility measurements.
Roman origin (mille passus); English statute mile fixed at 5,280 feet in 1593; standardized to 1,609.344 m exactly by the 1959 International Yard and Pound Agreement.
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Mile to Kilometer conversion formula
The relationship between miles and kilometers:
To convert miles to kilometers, multiply the value in miles by 1.609344. To reverse, multiply kilometers by 0.6213711922.
How to use this converter
Type a value into the calculator. The result in kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilometer to Mile converter for the reverse direction.
Step-by-step: convert miles to kilometers
- Write down the value in miles (mi).
- Multiply that value by the factor 1.609344.
- The product is the equivalent value in kilometers (km).
- To reverse, multiply the kilometer value by 0.6213711922.
Worked examples
Example 1 — Convert 1 mi to km:
1 × 1.609344 = 1.609344 km
Example 2 — Convert 100 mi to km:
100 × 1.609344 = 160.9344 km
Real-world example — American highway road-trip distances
A 100-mile road trip equals 160.93 km. American drivers planning trips abroad convert miles to km whenever they read European or Asian road signs that show distance in kilometres.
100 mi × 1.609344 = 160.9344 km
Real-world example — Five-kilometre to mile race
A 5-mile fitness-tracker reading equals 8.05 km. International running events frequently report distances in km; American runners coming from a 5-mile training base convert miles to km every time they read a course description.
5 mi × 1.609344 = 8.04672 km
Real-world example — Marathon distance familiarity
A 26.2-mile marathon equals 42.195 km. American marathon runners reading European training plans (in km) convert their familiar 26.2-mile race distance into km to plan their pace.
26.2 mi × 1.609344 = 42.1648128 km
Mile to Kilometer conversion table
Standard reference values for converting miles to kilometers:
| Mile [mi] | Kilometer [km] |
|---|---|
| 0.01 | 0.01609344 |
| 0.1 | 0.1609344 |
| 1 | 1.609344 |
| 2 | 3.218688 |
| 3 | 4.828032 |
| 4 | 6.437376 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 500 | 804.672 |
| 1000 | 1609.344 |
Frequently asked questions
How many kilometers is 1 mile?
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Popular length unit conversions
Convert Mile to other length units
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 mi = 1.609344 km) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.