Miles to Kilometers Converter
Convert miles to kilometers (mi to km) instantly with the exact 1 mile = 1.609344 km factor, worked examples, and a practical conversion table.
Specialist tool for Length9 supported unitsFocused single-task workflowPrivate in your browser
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Inputs that matter
A numeric value plus source and target units from the length group
Output to expect
Miles to Kilometers, with 9 supported units available
How it works
Linear conversion through a shared base-unit factor
- Check the source unit before copying the converted value.
- Retain enough precision for your use case; this tool displays up to 6 decimal places.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Exact Conversion Factor
The international mile is exactly 1,609.344 meters, so one mile equals exactly 1.609344 kilometers.
kilometers = miles × 1.609344Worked Example
For a 26.2-mile marathon distance, multiply 26.2 by 1.609344 to get 42.1648032 kilometers.
26.2 × 1.609344 = 42.1648032 kmRounding
The calculator keeps the exact factor internally and rounds only the displayed result. Two decimals are usually enough for travel; use more digits for technical work.
Updated: July 2026
Example Scenarios
Convert a route shown in miles to kilometers before driving in a country that uses metric road signs.
Translate mile-based training runs, half marathons, and marathon distances into kilometers.
Convert statute-mile distances to kilometers while keeping nautical miles separate from both units.
FAQ
Multiply the distance in miles by 1.609344. For example, 5 miles × 1.609344 = 8.04672 kilometers.
One international mile is exactly 1.609344 kilometers. The factor is exact because the international mile is defined as exactly 1,609.344 meters.
10 miles equals 16.09344 kilometers. For everyday travel, that is usually rounded to 16.09 km.
Divide kilometers by 1.609344, or multiply by approximately 0.6213711922. For example, 5 km is about 3.10686 miles.
The exact conversion factor is used internally, while the displayed value may be rounded for readability. Increase precision when you need engineering-level detail.
About Miles to Kilometers Converter
Enter any distance in miles to get kilometers instantly. The converter uses the exact international definition: 1 mile equals 1.609344 kilometers, with a reverse conversion and common-distance reference table.