Speed Converter
Convert km/h, mph, m/s, knots and mach.
| Metres per secondm/s | 0.2778 | |
| Kilometres per hourkm/h | 1 | |
| Miles per hourmph | 0.6214 | |
| Feet per secondft/s | 0.9113 | |
| Knotkn | 0.54 | |
| Mach (sea level)M | 0.0008 |
All conversions go through the metre per second using exact internationally agreed factors; only the display is rounded.
About Speed Converter
Speed limits, weather reports, running apps and flight trackers all use different units, and the mental arithmetic for converting between them is rarely accurate enough to rely on.
This converter handles every common speed unit at once and adds running pace in minutes per kilometre and per mile.
Frequently asked questions
What is a knot?
One nautical mile per hour, roughly 1.852 km/h, used in marine and aviation contexts.
Is mach a fixed speed?
No. It is the ratio to the local speed of sound, which varies with temperature. The converter uses the standard sea-level value of 1225 km/h.
How do I convert running pace?
Pace is the inverse of speed. The tool shows minutes per kilometre and per mile alongside the speed units.