Speed Converter
Convert between km/h, mph, m/s, knots, and ft/s — updates instantly as you type.
How to use this tool
Enter a value, then choose the "from" and "to" speed units. The converted result updates instantly.
About these conversions
All units convert through meters per second (m/s) using exact factors: 1 km/h = 0.277778 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.514444 m/s, 1 ft/s = 0.3048 m/s.
Frequently asked questions
How are speed conversions calculated?
Each unit converts to meters per second (m/s) using an exact factor, then to the target unit. For example, 1 mph = 0.44704 m/s exactly (from the international mile and hour definitions), and 1 knot = 1 nautical mile per hour = 0.514444 m/s.