Speed Converter
Convert miles per hour, kilometers per hour, meters per second, and knots instantly.
Speed Conversion Formulas
Speed is distance divided by time. Common units include mph (miles per hour, used in the US and UK), km/h (kilometers per hour, used internationally), m/s (meters per second, used in science), and knots (nautical miles per hour, used in maritime and aviation).
- mph to km/h: multiply by 1.60934 (1 mph = 1.60934 km/h)
- km/h to mph: multiply by 0.621371 (1 km/h = 0.621371 mph)
- m/s to km/h: multiply by 3.6 (1 m/s = 3.6 km/h)
- km/h to m/s: multiply by 0.277778 (1 km/h = 0.277778 m/s)
- knots to km/h: multiply by 1.852 (1 knot = 1.852 km/h)
mph to km/h Quick Reference
| mph | km/h |
|---|---|
| 1 mph | 1.60934 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 20 mph | 32.1869 km/h |
| 30 mph | 48.2803 km/h |
| 40 mph | 64.3738 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 70 mph | 112.654 km/h |
| 100 mph | 160.934 km/h |
Frequently Asked Questions
How do I convert mph to km/h?
Multiply mph by 1.60934. For example, 60 mph = 96.5604 km/h.
What is a knot?
A knot is one nautical mile per hour, equal to 1.852 km/h. Used in maritime and aviation.
How fast is the speed of sound in mph?
The speed of sound is approximately 767 mph (1,235 km/h) at sea level.
How do I convert m/s to km/h?
Multiply m/s by 3.6. For example, 10 m/s = 36 km/h.