How do I convert mph to km/h?

Take the value in mph and multiply by 1.609344. 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 mph to km/h online for free. Instant, accurate conversion with a handy reference table — runs in your browser.

Value

From

1.609344

1 mph = 1.609344 km/h

Quick reference

How do I convert mph to km/h?: Take the value in mph and multiply by 1.609344. 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.