About this tool
The Speed & Velocity Converter turns one speed into every common unit at once: metres per second, kilometres per hour, miles per hour, knots, feet per second, feet per minute and Mach number. Enter a value, pick the source unit, and the whole grid updates instantly.
Conversion is linear with metres per second as the base unit. Each unit stores how many of it equal one m/s, derived from the exact definitions 1 mph = 1609.344/3600 = 0.44704 m/s, 1 knot = 1852/3600 = 0.514444… m/s and 1 ft/s = 0.3048 m/s. Your value is converted to m/s (value ÷ source factor) and then multiplied by each target factor, so results stay exact.
Mach is included as a sea-level approximation using the ISA speed of sound, 340.29 m/s, so Mach 1 ≈ 1225 km/h ≈ 761 mph. The true speed of sound falls with altitude and temperature, so treat Mach here as a standard sea-level reference. All conversion runs locally in your browser with vanilla JavaScript — no uploads, works offline.