Speed Converter

Instantly convert between kilometers per hour (km/h) and miles per hour (mph). Simply type a value in either field to see the live conversion.

Conversions Made

+9,500,000

Rating

4.9/5 (5500+)

The process is automatic. Just enter a number in either field.

Enter a speed — Type a value in either the "Kilometers per hour" or "Miles per hour" box.
View the Result — The other box will automatically update with the converted speed as you type.

Quickly understand road signs and speed limits when driving in a country that uses a different system.

Convert vehicle speeds from international car reviews or technical manuals.

Convert your running, cycling, or swimming speed from your fitness tracker.

Understand wind speeds reported in either km/h or mph from global weather sources.

Kilometers per hour (km/h): The standard unit of speed in the metric system. Used in most countries worldwide.
Miles per hour (mph): The standard unit of speed in the imperial system. Primarily used in the United States, the United Kingdom, and a few other countries.

Which countries use miles per hour (mph)?

Is there a difference between a mile and a nautical mile?

How accurate are the conversions?

Bookmark this page for the fastest way to convert between km/h and mph.

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Speed Calculator