Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, feet per second, knots, and Mach instantly with all equivalents shown.
Quick Answer
1 mph = 1.609 km/h = 0.447 m/s. 1 knot = 1.151 mph = 1.852 km/h. Mach 1 = 767 mph = 1,235 km/h at sea level. Select units below to convert any speed value instantly.
Convert Speed
Enter a speed value and select units to convert.
All Equivalents
| Unit | Value |
|---|---|
| Miles per Hour (mph) | 60 |
| Kilometers per Hour (km/h) | 96.56064 |
| Meters per Second (m/s) | 26.8224 |
| Feet per Second (ft/s) | 88 |
| Knots (kn) | 52.13862 |
| Mach (Mach) | 0.0781994169 |
Speed References
Common speeds for real-world reference.
| Reference | mph | km/h | m/s |
|---|---|---|---|
| Walking Average human walking speed | 3.131711 | 5.04 | 1.4 |
| Cycling Average casual cycling speed | 14.987473 | 24.12 | 6.7 |
| Highway Driving 65 mph / 105 km/h | 65.094846 | 104.76 | 29.1 |
| Cheetah Fastest land animal | 74.937366 | 120.6 | 33.5 |
| Commercial Jet Cruising speed ~575 mph | 574.8926 | 925.2 | 257 |
| Speed of Sound Mach 1 at sea level | 767.2691 | 1,234.8 | 343 |
About This Tool
The Speed Converter provides instant, accurate conversions between six commonly used speed units: miles per hour, kilometers per hour, meters per second, feet per second, knots, and Mach number. Whether you are comparing international speed limits, working on physics calculations, or checking aviation speeds, this tool delivers real-time results with all equivalents displayed simultaneously.
Understanding Speed Units
Miles per hour (mph) is the standard speed unit in the United States and United Kingdom for road travel. Kilometers per hour (km/h) is used by most of the rest of the world. Meters per second (m/s) is the SI standard used in science. Knots are used in maritime and aviation contexts, where one knot equals one nautical mile per hour. Mach numbers express speed relative to the speed of sound, which varies with altitude and temperature.
Common Speed Limit Comparisons
US highway speed limits of 55-75 mph correspond to 89-121 km/h. European motorway limits of 120-130 km/h equal 75-81 mph. The German Autobahn has advisory speeds of 130 km/h (81 mph) with no hard limit on many sections. Understanding these conversions is essential for international travelers and for comparing vehicle performance specifications across markets.
Mach Number and the Speed of Sound
Mach 1, the speed of sound, is approximately 767 mph or 1,235 km/h at sea level in standard atmospheric conditions. At higher altitudes where the air is colder, the speed of sound decreases. Commercial jets typically cruise at Mach 0.78-0.85, while supersonic aircraft like the Concorde flew at Mach 2.04 (1,354 mph). Modern fighter jets can exceed Mach 2, and experimental aircraft have reached beyond Mach 9.
Frequently Asked Questions
How do I convert miles per hour to kilometers per hour?
What is a knot and how does it relate to mph?
What speed is Mach 1?
Why do scientists use meters per second?
How fast is feet per second compared to mph?
Was this tool helpful?