A statute mile is exactly 1,609.344 meters.
Miles to Kilometers Converter — mi to km
Convert Mile (mi) to Kilometer (km) using the exact conversion factor (1 mile = 1.609344 kilometer). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Miles to Kilometers converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilometer is 1000 meter units.
Result = input x 1609.344 / 1000.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Miles to Kilometers
Mile and Kilometer both measure length. Mile is typically associated with united States, while Kilometer is typically associated with standard road, distance, and mapping unit in nearly every country except the United States.
Formula
kilometers = miles × 1.609344
This factor comes from each unit's defined relationship to the category's base unit: 1 mile equals 1609.344 base units, and 1 kilometer equals 1000 base units, so dividing one by the other gives the direct mile-to-kilometer factor of 1.609344.
Simple example
1 mi × 1.609344 = 1.609344 km
1 mile = 1.609344 kilometers.
Real-world example
10 mi × 1.609344 = 16.09344 km
10 miles = 16.09344 kilometers.
Conversion table
| Mile (mi) | Kilometer (km) |
|---|---|
| 1 mi | 1.609344 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 21.0975 mi | 33.95313504 km |
| 42.195 mi | 67.90627008 km |
| 100 mi | 160.9344 km |
Reverse conversion: Kilometer to Mile
1.609344 km × 0.6213711922 = 1 mi
1.609344 kilometers = 1 mile.
miles = kilometers × 0.621371192237
For a page dedicated to this direction, see Kilometer to Mile.
Mile vs. Kilometer
| Aspect | Mile | Kilometer |
|---|---|---|
| Family | US/imperial customary unit | SI derived (metric prefix) unit |
| Typical use | Road signage, speed limits, and odometers in the US and UK | Road signage, speed limits, and vehicle odometers outside the US |
| Where it's used | United States | Standard road, distance, and mapping unit in nearly every country except the United States |
Understanding the Mile
Mile (mi) measures distance. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). It is classified as a US/imperial customary unit.
Where it's used: United States United Kingdom (road distances and speed limits)
Uses of the Mile today
- Road signage, speed limits, and odometers in the US and UK
- Everyday distance estimates in US/UK contexts
- Aviation and marine contexts use the related but distinct nautical mile instead
History of the Mile
The mile traces back to the Roman 'mille passus' ('a thousand paces'), about 1,000 double-steps of a marching legion, roughly 1,480 meters. The English statute mile diverged from this over the medieval period.
Elizabeth I's government fixed the English statute mile at 5,280 feet in 1593, replacing the old Roman-derived value so it would align evenly with the furlong (660 ft), a unit already standard in English land measurement.
The modern international mile (1,609.344 m exactly) was fixed by the same 1959 International Yard and Pound Agreement that standardized the pound, tying it to the internationally agreed yard of exactly 0.9144 meters.
Historical origin. Mile was not the invention of a single named person; it developed through the process described above.
Understanding the Kilometer
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard road, distance, and mapping unit in nearly every country except the United States
Uses of the Kilometer today
- Road signage, speed limits, and vehicle odometers outside the US
- Geographic and mapping distances
- Endurance sports (marathons are measured in kilometers internationally, though the marathon distance itself is a fixed value in both systems)
History of the Kilometer
The meter was defined during the French Revolutionary metric reforms as one ten-millionth of the distance from the North Pole to the Equator along a meridian through Paris. 'Kilo-' is simply the SI prefix for 1,000, making the kilometer a direct decimal multiple.
The meter itself has been redefined several times as measurement precision improved — from a physical platinum-iridium bar (1889) to a krypton-86 wavelength (1960) to its current definition (1983) as the distance light travels in a fixed fraction of a second.
Historical origin. Kilometer was not the invention of a single named person; it developed through the process described above.
Mile — sources
- NIST — International yard and pound (1959) — Fixes the modern mile via the international yard.
Kilometer — sources
- BIPM — The metre (SI base unit) — Current definition and history of the meter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometers are in 1 mile?
1 mile equals 1.609344 kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert mile to kilometer?
Multiply the mile value by 1.609344. The converter above does this instantly to whatever precision you set.
How do I convert kilometer back to mile?
Use the reverse factor: 1 kilometer equals 0.6213711922 miles. You can also use the swap control in the converter above to flip the direction instantly.
What is a mile?
Mile (mi) measures distance. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). It is classified as a US/imperial customary unit.
What is a kilometer?
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Is the mile to kilometer conversion exact?
Yes. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the mile still used today?
United States United Kingdom (road distances and speed limits)