Universal Speed Converter Kilometers per Hour (kph) Miles per Hour (mph) Knots (nautical mph) Meters per Second (m/s) Clear All Fields What is a Speed Converter? Speed conversion is the process of switching between different units used to measure how fast an object is moving. While most of the world uses Kilometers per Hour (KPH) , countries like the USA and UK use Miles per Hour (MPH) . Additionally, the aviation and maritime industries use Knots . Common Speed Units: KPH: Used for road speed limits in most countries. MPH: Standard speed unit in the US and UK. Knots: Used for ships and aircraft (1 Knot = 1 nautical mile per hour). m/s: The scientific...