Length Converter
Convert between meters, feet, inches, miles, and more.
A dedicated online speed converter to instantly switch between different speed units. Convert kilometers per hour, miles per hour, meters per second, and knots effortlessly.
The Speed Converter is a quick and reliable online tool for converting values between various units of speed, such as kilometers per hour (km/h) and miles per hour (mph).
Each unit of speed has a specific context where it is most commonly used. Understanding these contexts helps in choosing the right unit for your needs.
This is the standard metric unit for speed, used for road transportation and speed limits in most countries around the world.
The standard imperial unit for speed, primarily used in the United States, the United Kingdom, and a few other countries for vehicle speed and road signs.
This is the base unit of speed in the International System of Units (SI). It is the standard for scientific and physics calculations because it simplifies equations involving distance and time.
A knot is a specialized unit equal to one nautical mile per hour. It is the standard unit of speed used exclusively in maritime (shipping) and aviation (flight) navigation.
Knots are based on nautical miles, which are linked to the Earth's longitude and latitude. One nautical mile corresponds to one minute of latitude, making it much easier for pilots and ship captains to perform navigation calculations on charts.
The difference lies in the distance unit used: kilometers versus miles. A mile is longer than a kilometer (1 mile ≈ 1.609 km). Therefore, a speed of 100 mph is significantly faster than a speed of 100 km/h.
For a value of 1, the fastest unit is Meters per second (m/s). For example, 1 m/s is equal to 3.6 km/h or approximately 2.24 mph, making it the largest speed among the common units for the same numerical value.
Mach 1 refers to the speed of sound. It is not a fixed value, as the speed of sound changes depending on factors like air temperature and altitude. At sea level and 20°C (68°F), Mach 1 is approximately 1,235 km/h or 767 mph.
A rough but useful mental trick is the "times 8, divide by 5" rule. For example, 50 mph is approximately (50 * 8) / 5 = 400 / 5 = 80 km/h. The precise answer is 80.47 km/h, so this estimate is very close.
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Convert between km/h, mph, m/s, and knots to cover all your speed conversion needs.
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