Speed Converter
Enter a value and select units to convert
Enter a value and select units to convert
The speed converter allows you to convert between different units of speed, from everyday measurements like kilometers per hour and miles per hour to specialized units like Mach number and the speed of light. This tool is useful for physics, engineering, transportation, aviation, and many other fields where speed measurements are needed.
Common Speed Measurement Systems
Metric System (SI)
The International System of Units (SI) uses meters per second (m/s) as the standard unit of speed.
- Meter per second (m/s): The base SI unit of speed
- Kilometer per hour (km/h): Commonly used for vehicle speeds in most countries
- Other metric combinations: cm/s, mm/s, etc.
Imperial/US Customary System
Used primarily in the United States and a few other countries.
- Miles per hour (mph): Standard for road speed limits in the US, UK, and some other countries
- Feet per second (ft/s): Often used in engineering applications
- Other imperial combinations: in/s, yd/min, etc.
Maritime and Aviation Units
Specialized units used in maritime navigation and aviation.
- Knot (kn): One nautical mile per hour, used in maritime navigation and aviation
- Mach number (M): Ratio of an object's speed to the speed of sound in the surrounding medium
Scientific Reference Speeds
Important reference speeds used in science and physics.
- Speed of sound: Approximately 343 m/s (1,235 km/h) in dry air at 20°C
- Speed of light (c): Exactly 299,792,458 m/s in vacuum, often used as a universal speed limit
Common Speed Conversions
| From | To | Multiply By |
|---|---|---|
| Kilometers per hour | Meters per second | 0.2778 |
| Meters per second | Kilometers per hour | 3.6 |
| Miles per hour | Kilometers per hour | 1.60934 |
| Kilometers per hour | Miles per hour | 0.62137 |
| Miles per hour | Feet per second | 1.46667 |
| Knots | Kilometers per hour | 1.852 |
| Knots | Miles per hour | 1.15078 |
| Mach 1 | Kilometers per hour | 1235 |
| Mach 1 | Miles per hour | 767 |
| Speed of light | Kilometers per second | 299,792.458 |