What Is a Speed Converter?
A speed converter transforms velocity values between units such as kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots, and feet per second. It is essential for travel, athletics, and physics applications.
How to Use This Speed Converter
- Enter the speed value.
- Select the source unit from the “From” dropdown (e.g., km/h).
- Click “Calculate” to see the value converted to all supported units at once (km/h, mph, m/s, knots).
Key Concepts
Key conversions: 1 km/h = 0.621371 mph = 0.277778 m/s. 1 mph = 1.60934 km/h. 1 knot = 1.852 km/h = 1.15078 mph. 1 m/s = 3.6 km/h. The speed of sound is approximately 343 m/s (1,235 km/h) at sea level, and the speed of light is 299,792,458 m/s.
Result = Value × (From Factor ÷ To Factor)
Frequently Asked Questions
What is a knot?
A knot equals one nautical mile per hour (1.852 km/h). It is the standard speed unit in aviation and maritime navigation worldwide.
How do I convert km/h to m/s quickly?
Divide km/h by 3.6 to get m/s. For example, 100 km/h = 27.78 m/s. This factor comes from 1000 meters / 3600 seconds.
What is Mach number?
Mach is the ratio of speed to the speed of sound. Mach 1 = speed of sound (~1,235 km/h at sea level). Mach 2 is twice the speed of sound. It varies with altitude and temperature.