Speed Converter
Convert between km/h, mph, m/s, knots, and more speed units.
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Convert between km/h, mph, m/s, knots, and more speed units.
Convert between km/h, mph, m/s, knots, Mach, and more.
Results update in real-time as you type.
Includes knots and Mach for specialized applications.
Uses exact conversion factors for accurate calculations.
Speed conversion is needed when comparing vehicle specifications from different countries, understanding weather reports, or working with scientific data. Different countries and industries use different speed units.
Pilots and sailors rely on knots, while most countries use km/h for road speeds. The US uses mph. Scientists use m/s. Our converter bridges all these systems.
60 mph is about 97 km/h, not 60 km/h. This matters for speed limits when driving abroad.
The speed of sound varies with altitude and temperature. Mach 1 at sea level differs from Mach 1 at 30,000 feet.
Saying knots per hour is redundant. A knot IS nautical miles per hour.
Weather reports may use km/h, mph, m/s, or knots depending on the country. Always check the unit.
Divide km/h by 1.60934 or multiply by 0.621371. Example: 100 km/h = 62.14 mph.
A knot equals one nautical mile per hour, or about 1.852 km/h (1.151 mph). Used in aviation and maritime contexts.
Mach 1 is the speed of sound, approximately 1,235 km/h (767 mph) at sea level and 20C. It varies with altitude and temperature.
The speed of light in vacuum is 299,792,458 m/s or approximately 1.08 billion km/h. It is the universal speed limit.
Meters per second (m/s) is the SI unit for speed. It is used in physics and engineering worldwide.