Speed Converter
Convert speed units instantly between m/s, km/h, mph, knots, and more.
Popular Conversions
| Conversion | Formula / Example |
|---|---|
| Kilometers/Hour to Miles/Hour | 1 km/h = 0.621371 mph |
| Meters/Second to Kilometers/Hour | 1 m/s = 3.6 km/h |
| Miles/Hour to Kilometers/Hour | 1 mph = 1.60934 km/h |
| Knots to Kilometers/Hour | 1 knot = 1.852 km/h |
| Mach to Kilometers/Hour | 1 mach ≈ 1225.04 km/h |
About the Speed Converter
This speed converter gives you instant calculations between the most commonly used units of speed. Knowing how to convert between these units is important for everyday travel, international driving, aviation, and scientific computations.
Some essential formulas driving these conversions include: 1 km/h = 0.621371 mph; and inversely, 1 mph = 1.60934 km/h. Therefore, highway speeds of 100 km/h translate to 62.1371 mph. In the fields of aviation and maritime navigation, knots are standard, with 1 knot equaling 1.852 km/h. For scientific and high-velocity calculations, 1 m/s equates to exactly 3.6 km/h, and Mach 1 (the speed of sound) sits roughly at 1234.8 km/h or 767 mph depending on atmospheric conditions.
Use cases range from translating foreign speed limits when renting a car abroad, to converting wind speeds in a weather report, to determining an aircraft's cruising speed. Just punch in your number and swap between units seamlessly.
Frequently Asked Questions
How do I convert km/h to mph?
To convert kilometers per hour (km/h) to miles per hour (mph), multiply the speed in km/h by 0.621371.
How many mph is 100 km/h?
100 kilometers per hour is equal to exactly 62.1371 miles per hour.
What is Mach 1 in km/h?
Mach 1, the speed of sound at sea level at 15 °C, is approximately 1,234.8 km/h or 767 mph.
How fast is a knot in km/h?
One knot (nautical mile per hour) is equal to exactly 1.852 kilometers per hour.
How do I convert m/s to km/h?
To convert meters per second to kilometers per hour, multiply the speed in m/s by 3.6.