Kilometer to mile

Reference table

How the conversion works

The input is converted into m using the source factor and offset, then into mile. This keeps unit definitions consistent across the length collection.

Definitions and sources

Factors are maintained in the versioned unit dataset. Output is rounded to your selected significant digits; calculation uses JavaScript double precision.

• https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9
• https://www.bipm.org/en/publications/si-brochure

How to use this tool

1. Enter a finite numeric value in kilometer.
2. Choose the significant digits for your result.
3. Copy or download the result, including its formula.

Try this example

10

Accuracy and scope

International foot is used. Light-year uses a Julian year of 365.25 days; parsec uses the exact astronomical unit and angle definition.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.