Free Online Miles to KM
Miles and kilometres sit at the exact ratio 1 mile = 1.609344 km (defined 1959). Type into either field; the other updates instantly.
Your data is processed entirely in your browser and never sent to any server.
How to Use This Converter
- Type a distance into either the Miles or Kilometres field.
- The other field updates instantly using the exact 1.609344 factor.
- Clear a field to start a fresh conversion.
What Is a Miles to KM?
The international mile was pinned at exactly 1609.344 metres in the 1959 agreement that also fixed the international yard, foot and inch. That makes the conversion exact, with no rounding error built in. For mental arithmetic, multiplying miles by 1.6 lands within 1% of the true value.
This pair shows up constantly for US and UK drivers reading European road signs, runners moving between 5K events and mile races, and pilots cross-checking ground distance against nautical miles. The reverse (km back to miles) is just as common when a metric-country traveller plans a US road trip.
Use the broader length converter if you also need yards, inches or metres in the same calculation.
Frequently Asked Questions
How many km in a mile?
Marathon distance?
5K in miles?
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.