Speed Converter
Convert Kilometers per hour, Miles per hour, Meters per second, Knots, Feet per second & More
Free online speed converter for all common units. Instantly convert between kilometers per hour, miles per hour, meters per second, knots, feet per second, and more.
What is a Speed Converter?
A speed converter is a tool that allows you to quickly and accurately convert between different units of speed, such as kilometers per hour, miles per hour, meters per second, knots, feet per second, Mach, and even the speed of light. This is essential for science, engineering, travel, sports, and everyday life when working with different measurement systems.
Supported Speed Units
- Kilometer per hour (km/h): The standard unit for speed limits and vehicles in most countries.
- Mile per hour (mph): Used for speed limits and vehicles in the US and UK.
- Meter per second (m/s): The SI unit of speed, used in science and engineering.
- Foot per second (ft/s): Used in the US for some engineering and sports applications.
- Knot (kn): Used in maritime and aviation contexts. 1 knot = 1 nautical mile per hour.
- Mach: The speed of sound in air at sea level (≈ 1,235 km/h or 767 mph).
- Speed of light (c): The ultimate speed limit in the universe (299,792,458 m/s).
Real Life Speed Examples
- Walking speed: ≈ 5 km/h (3.1 mph, 1.39 m/s)
- Running speed (average): ≈ 12 km/h (7.5 mph, 3.33 m/s)
- Highway speed limit (Europe): ≈ 130 km/h (81 mph)
- Commercial jet cruising speed: ≈ 900 km/h (560 mph, 0.74 Mach)
- Speed of sound (Mach 1): ≈ 1,235 km/h (767 mph, 343 m/s)
- Speed of light (c): 299,792,458 m/s (1,079,252,848.8 km/h)
How to Use the Speed Converter
- Enter the value you want to convert.
- Select the unit you are converting from.
- View instant conversions to all other supported units below.
Why Use ManyCalcs Speed Converter?
- Completely free and ad-free.
- Supports all major speed units.
- Instant, accurate, and easy-to-use interface.
- Mobile-friendly and accessible on any device.
- Educational content for every unit.
Frequently Asked Questions
- How do I convert km/h to mph?
- Enter the value in km/h, select "Kilometer per hour (km/h)", and view the result in mph in the output list.
- What is a knot?
- A knot is one nautical mile per hour (1.852 km/h). Used in maritime and aviation contexts.
- What is Mach?
- Mach is the speed of sound in air at sea level (about 1,235 km/h or 767 mph).
- Is this speed converter free?
- Yes, the ManyCalcs speed converter is 100% free and always will be.
For more information, see Units of speed on Wikipedia.