What is a Speed Converter?
The Speed Converter helps you convert between km/h, mph, m/s, knots, Mach, and 19+ other speed units. Perfect for transportation, physics, athletics, and navigation applications.
Key Features:
- 19+ Units: km/h, mph, m/s, knots, Mach, speed of light/sound
- Multiple Systems: Metric (km/h), imperial (mph), maritime (knots), scientific
- Quick Conversions: Common speed benchmarks instantly
- Privacy Friendly: All calculations in your browser
Perfect For: Travelers, pilots, athletes, physicists, engineers.
Frequently Asked Questions
How do I convert km/h to mph?
To convert kilometers per hour to miles per hour, multiply by 0.621371. For example, 100 km/h = 100 × 0.621371 = 62.14 mph. To convert mph to km/h, multiply by 1.60934.
What is a knot and why is it used for ships?
A knot is one nautical mile per hour (1.852 km/h or 1.151 mph). It's used in maritime and aviation because nautical miles are based on Earth's latitude, making navigation calculations simpler on curved surfaces.
How fast is Mach 1?
Mach 1 is the speed of sound, approximately 343 m/s (1,235 km/h or 767 mph) at sea level in standard conditions. The exact speed varies with altitude and temperature because sound travels differently in different air densities.
What's the difference between m/s and km/h?
Meters per second (m/s) is the SI unit used in physics and science, while kilometers per hour (km/h) is used for everyday speeds like cars. To convert: 1 m/s = 3.6 km/h, or divide km/h by 3.6 to get m/s.
How fast is the speed of light?
The speed of light in vacuum is exactly 299,792,458 m/s (about 300,000 km/s or 186,282 miles/s). This is the universal speed limit - nothing can travel faster according to Einstein's theory of relativity.