Speed Converter
Convert between mph, km/h, m/s, feet per second and knots instantly.
Convert speed and velocity units
This speed converter switches instantly between the units used for driving, running, sailing, and science: miles per hour (mph), kilometres per hour (km/h), metres per second (m/s), feet per second (ft/s), and knots. It is handy for converting car speeds between the US/UK and the rest of the world, reading marine and aviation speeds in knots, or working out pace in physics problems.
Common speed conversions
| From | To | Result |
|---|---|---|
| 1 mph | km/h | 1.609 km/h |
| 60 mph | km/h | 96.56 km/h |
| 100 km/h | mph | 62.14 mph |
| 1 knot | mph | 1.151 mph |
| 1 m/s | km/h | 3.6 km/h |
What is a knot?
A knot is one nautical mile per hour, used in shipping and aviation. One knot equals about 1.151 mph or 1.852 km/h. Because nautical miles are based on the Earth’s circumference, knots are convenient for navigation over long distances.
Frequently asked questions
How do I convert mph to km/h?
Multiply miles per hour by 1.609 to get kilometres per hour. For example, 70 mph is about 112.7 km/h.
How fast is 100 km/h in mph?
About 62 mph. Multiply any km/h value by 0.621 to convert it to mph.