Convert between m/s, km/h, mph, knots, mach and more speed units instantly
Speed Converter is a free online tool that converts between different units of speed and velocity. It supports metric units (m/s, km/h), imperial units (mph, ft/s), nautical units (knots), and special units (Mach, speed of light). Perfect for physics, engineering, transportation, and aviation applications.
All conversions use standard conversion factors and are accurate to 6 decimal places. For most practical purposes, this provides excellent precision.
Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction). This converter handles speed/velocity magnitudes.
Mach number depends on the speed of sound, which varies with temperature and altitude. This converter uses standard sea-level conditions (343 m/s).
Yes, all calculations happen locally in your browser. Your data never leaves your device.
Yes, once loaded, the converter works completely offline in your browser.