Speed Converter
Convert speed between mph, km/h, meters per second, knots, and feet per second.
Converting a speed
Type the speed, choose the unit it is in, and select the one you want to read it in. The conversion shows immediately, and the swap button turns a miles-per-hour figure into kilometers per hour and back with a single tap.
You can move between the road units drivers know, miles and kilometers per hour, the meters per second used in physics, and the knot that ships and aircraft navigate by. Feet per second is there for ballistics and sports tracking.
Speed conversions at a glance
| 100 km/h | 62.1371 mph |
| 60 mph | 96.5606 km/h |
| 1 knot | 1.852 km/h |
| 1 m/s | 3.6 km/h |
| 1 mph | 1.46667 ft/s |
| 100 km/h | 27.7778 m/s |
Why so many ways to measure speed
Every speed is a distance divided by a time, so the unit you reach for usually follows the distance unit in play. Road signs in the United States count miles per hour while most other countries post kilometers per hour, which is the conversion travelers run into most.
The knot has its own logic: one knot is one nautical mile per hour, and a nautical mile traces a minute of latitude on the globe. That tie to the Earth's geometry is exactly why sailors and pilots have kept it, long after metric units took over elsewhere.
Frequently asked questions
- How do I convert mph to km/h?
- Multiply miles per hour by 1.60934. So 60 mph is about 96.6 km/h. A rough road-trip estimate is to add half again, since the factor is close to 1.6.
- What is a knot?
- A knot is one nautical mile per hour, equal to about 1.852 km/h or 1.151 mph. It is the standard speed unit in sea and air navigation because it ties directly to latitude on charts.
- How fast is 100 km/h in mph?
- 100 km/h is about 62.14 mph. This is a common highway speed in many countries, roughly equivalent to a US limit between 60 and 65 mph.
- How do I convert meters per second to km/h?
- Multiply meters per second by 3.6. So 10 m/s is 36 km/h. Meters per second is the standard scientific unit, while km/h is more familiar for traffic.
- What is feet per second used for?
- Feet per second appears in physics problems, ballistics, and sports tracking such as pitch and serve speeds. One mile per hour equals about 1.467 feet per second.