Speed Converter
Convert speed between km/h, mph, m/s, knots, Mach number, and more instantly.
📋 How to Use
- Enter the speed value you want to convert.
- Select the source unit (e.g., km/h) from the dropdown.
- Select the target unit (e.g., mph) from the second dropdown.
- The converted value appears instantly.
- View all equivalent values across all supported units simultaneously.
About This Tool
Speed Converter — Convert Between All Speed Units
Speed measurements vary across industries and countries. Cars and road signs use km/h or mph, aviation uses knots, science uses m/s, and aerospace uses Mach numbers. Our Speed Converter handles all these units with instant, accurate conversions.
Supported Speed Units
- Meters per second (m/s) — SI base unit, used in physics and science.
- Kilometers per hour (km/h) — Standard unit for road speed in most countries.
- Miles per hour (mph) — Standard unit for road speed in the US, UK, and a few other countries.
- Knots (kn) — Used in maritime and aviation navigation. 1 knot = 1 nautical mile per hour.
- Feet per second (ft/s) — Used in some engineering and ballistics applications.
- Mach number — Speed relative to the speed of sound in air (at sea level, 20°C: 1 Mach ≈ 1,235 km/h or 767 mph).
- Speed of light (c) — Used in physics for relativistic calculations.
Key Speed References
| Object | Speed | |---|---| | Walking pace | ~5 km/h (3.1 mph) | | Bicycle | ~25 km/h (15.5 mph) | | Highway speed limit | ~100–130 km/h (62–80 mph) | | Commercial aircraft | ~900 km/h (560 mph) ≈ Mach 0.85 | | Speed of sound (sea level) | 1,235 km/h (767 mph) ≈ Mach 1 | | Speed of light | 1,079,252,849 km/h |
Use Cases
Automotive: Convert speed limits when driving in countries using different speed units.
Aviation: Convert aircraft speeds between knots and km/h or mph for different instruments and charts.
Marine navigation: Convert vessel speeds between knots and km/h.
Physics and science: Convert velocities in scientific calculations from m/s to any other unit.
Sports: Convert running, swimming, and cycling speeds between m/s and km/h or mph.
Convert speeds now — free and instant.