Enter a distance in miles to find the same distance in kilometers.
Advanced options
This is the same physical distance expressed in kilometers.
Table of contents
How to use our Miles to Km Converter
- Enter the distance from a map, route, odometer, treadmill, or race listing in "Distance (miles)."
- Use a number such as 2.5 or 1,000. You can also type a matching suffix, such as "5 mi."
- Open "Advanced options" and change "Result decimal places" only if you need a different amount of displayed detail.
- Select "Calculate" to see the same distance in kilometers.
- Sanity-check a positive result: the kilometer number should be a little larger than the miles number because 1 mile is more than 1.6 kilometers.
Definitions
Statute mile: The ordinary land mile used for US road distances and many US distance listings. One statute mile is exactly 1.609344 kilometers.
Kilometer (km): A metric unit of length equal to 1,000 meters.
Decimal places: The digits shown to the right of a decimal point. This setting changes the displayed rounding, not the converted distance.
Rounded value: A shorter displayed number close to the unrounded value. For example, 8.04672 rounded to two decimal places is 8.05.
Common mistakes and quick fixes
Mistake: Entering a speed such as 60 mph instead of a distance.
Fix: Enter only a distance in miles. A speed needs a time before it can be used to find distance.
Mistake: Typing "5 km" in "Distance (miles)."
Fix: Enter the original distance in miles, such as 5 or 5 mi. This converter goes from miles to kilometers.
Mistake: Using a comma as a decimal mark or typing 1,00.
Fix: Use a decimal point for decimals, such as 1.5. Use commas only for thousands, such as 1,000.
Mistake: Entering a negative physical distance.
Fix: Enter 0 or a positive number. Zero miles is valid and converts to zero kilometers.
Mistake: Copying a rounded answer into work that needs more detail.
Fix: Increase "Result decimal places" before calculating, then round only as your instructions require.
Limitations & Key Assumptions / Boundary Conditions
- This converter is for non-negative statute-mile distances, not nautical miles, survey miles, or speeds such as miles per hour.
- The conversion factor is exact, but the displayed kilometer value is rounded to the selected number of decimal places.
- If a map, sign, or app already rounded the original miles value, converting it cannot recover missing detail.
- Very large finite entries are rejected if multiplying them cannot produce a finite number.
Methodology
Calculation
The calculator multiplies the entered statute-mile distance by 1.609344. The international mile is exactly 1,609.344 meters, or 1.609344 kilometers.
kilometers = miles * 1.609344
Worked example
For 5 miles, multiply 5 by 1.609344. The unrounded distance is 8.04672 kilometers. With two decimal places selected, the display shows 8.05 km.
5 * 1.609344 = 8.04672 km
Display rounding
The calculator uses the unrounded product, then rounds only the displayed kilometer value to the selected number of decimal places.