Convert speed and velocity between km/h, mph, meters per second, knots and feet per second.
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How to use the Speed
Enter the number you want to convert in the Value field.
Pick the unit you're converting From and the unit you want To.
Read the converted result, or use ⇅ to swap the two units.
Check the All units table to see your value expressed in every supported unit at once.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
About Speed
Common speed units
Cars use km/h or mph, science uses m/s, aviation and sailing use knots (nautical miles per hour).
Key conversions
1 m/s = 3.6 km/h. 1 mph is about 1.609 km/h. 1 knot is about 1.852 km/h or 1.151 mph.
Where it helps
Converting vehicle speeds when travelling, reading weather wind speeds, and physics problems.
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