Speed Converter

About the Speed Converter

The Speed Converter translates speed between every common unit — kilometres per hour (km/h), miles per hour (mph), metres per second (m/s), knots, and feet per second. Drivers travelling between metric and imperial countries, sailors and pilots working with knots, runners and cyclists comparing pace, and physics students converting units in homework all rely on speed conversion every day.

Units supported

km/h (used worldwide for road speed except in the US and UK), mph (US and UK road speed), m/s (the SI base unit used in physics and engineering), knots (nautical and aviation, 1 knot = 1 nautical mile per hour), ft/s (US engineering), Mach (multiples of the speed of sound, used in aviation), and km/s (used for spacecraft and astronomical objects).

How to use it

1. Type a number in any speed field.
2. Every other unit updates in real time with the equivalent value.
3. Click any value to copy it to your clipboard.
4. Reverse: type any unit to convert backward to all others.

Common use cases

Converting US highway speed limits (mph) to km/h when driving in Europe or Canada, calculating boat speed in knots from the GPS reading in km/h, translating pilot reports from km/h to knots for navigation, sizing wind power generators based on m/s wind speed, comparing running pace from race results across countries, and verifying speedometer readings during car imports.

Privacy

All conversions run in your browser using simple multiplication. Nothing is sent to our servers. The tool works offline once loaded, useful in remote areas with poor connectivity.

Tamer Baghdadi

CEO / Co-Founder