Speed Converter
Convert between mph, km/h, m/s, knots, and feet per second instantly.
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About this speed converter
This tool converts between 5 common speed units. Pick any two units, enter a value, and the result updates instantly — every conversion happens with simple arithmetic directly in your browser, so there's no network request, no waiting, and it keeps working even if you lose your internet connection.
Units covered
- Miles per Hour (mph) — the standard speed unit for road travel in the US and UK.
- Kilometers per Hour (km/h) — the standard speed unit for road travel across most of the world.
- Meters per Second (m/s) — the SI unit of speed, standard in physics and scientific measurement.
- Knot (kn) — equal to one nautical mile per hour, the standard unit for maritime and aviation speed.
- Feet per Second (ft/s) — commonly used in US engineering and ballistics for short-range or reaction-time speeds.