How do I convert km/h to mph?

Take the value in km/h and multiply by 0.621371. Or just type the value above — the result updates instantly.

How accurate is the conversion?

Conversions use exact internationally agreed factors and display up to 6 significant digits.

Yes, completely free with no signup required and no limits for normal use.

Convert km/h to mph online for free. Instant, accurate conversion with a handy reference table — runs in your browser.

Value

From

0.621371

1 km/h = 0.621371 mph

Quick reference

How do I convert km/h to mph?: Take the value in km/h and multiply by 0.621371. Or just type the value above — the result updates instantly.
How accurate is the conversion?: Conversions use exact internationally agreed factors and display up to 6 significant digits.
Is this tool free?: Yes, completely free with no signup required and no limits for normal use.