Miles to Km Converter

About Miles → Km

Mile-based training plans, US rental car odometers, and UK/US race distances often need conversion to kilometers for international comparison or event registration.

Multiply miles by about 1.609344 to obtain kilometers—the inverse of km-to-miles.

Choose this converter when starting from miles, not kilometers.

How to use this tool

Type miles. Calculate for kilometer equivalent.

Formula & methodology

This miles to km converter applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.

km = miles x 1.609344

Tips for accurate results

• Half marathon 13.1 mi is about 21.08 km.
• Car fuel economy in mpg relates to distance in miles—convert distance separately from economy.
• Walking apps may log miles on US phones set to imperial.
• Reverse? Use km-to-miles.

Frequently asked questions

Sources & references

The factors and formulas used by this tool follow these references:

• NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
• BIPM — The International System of Units (SI Brochure, 9th edition)

Last reviewed: September 2026. Found an error? Tell us and we will correct it.