Speed Converter - Convert MPH, KPH & More
Speed Converter
Easily convert between Kilometers per Hour (km/h), Miles per Hour (mph), Meters per Second (m/s), Feet per Second (ft/s), Knots (kt), and Mach. Whether you're measuring car speed, aircraft velocity, or physics experiment values, this tool gives you fast and accurate conversions.
Why Use It?
- Ideal for travel, sports timing, aeronautics, and scientific calculations.
- Converts between metric and imperial speed units.
- Accurate to four decimal places.
- Great for students, pilots, athletes, and engineers alike.
Popular Conversions
- Kilometers per Hour to Miles per Hour
- Miles per Hour to Kilometers per Hour
- Meters per Second to Feet per Second
- Feet per Second to Meters per Second
- Knots to Miles per Hour
- Miles per Hour to Knots
Supported Units
- Kilometers per Hour (km/h) - Commonly used for road speeds and travel distances in most countries.
- Miles per Hour (mph) - Standard unit for speed in the US and UK road systems.
- Meters per Second (m/s) - SI unit of speed; widely used in science and engineering.
- Feet per Second (ft/s) - Used in ballistics and physics calculations in imperial contexts.
- Knots (kt) - Used in maritime and aviation contexts; 1 knot = 1 nautical mile per hour.
- Mach - Speed relative to the speed of sound; used for aircraft and high-speed aerospace vehicles.
Common Uses
- Converting car or bike speeds while traveling abroad
- Aviation and marine navigation
- Analyzing athletic performance in races or training
- Solving physics and engineering problems
- Comparing vehicle and wind speeds across different units
- Calculating sound barrier speeds in aerospace studies
Frequently Asked Questions
What is Mach speed?
Mach is a ratio comparing an object's speed to the speed of sound in air. Mach 1 equals the speed of sound (approx. 343 m/s or 1,235 km/h) at sea level under standard atmospheric conditions.
How many mph is 100 km/h?
100 kilometers per hour is approximately 62.1371 miles per hour.
Why do airplanes use knots instead of km/h or mph?
Knots are based on nautical miles, which relate closely to lines of latitude and longitude. This makes them especially useful for navigation over the Earth's curved surface.
Are m/s and km/h interchangeable?
They measure the same quantity (speed), but 1 m/s = 3.6 km/h. So, they are not numerically equivalent and require conversion.