Speed Converter

Frequently asked questions

How do I convert mph to km/h?

Multiply miles per hour by 1.609344 to get kilometres per hour. So 60 mph is about 96.6 km/h. One knot is one nautical mile per hour, equal to 1.852 km/h, which is why ship and aircraft speeds differ from road speeds.

What is the difference between knots and km/h?

A knot equals 1.852 km/h or about 1.151 mph. Knots are used in aviation and maritime navigation because they are based on nautical miles, which are tied to the geometry of Earth (1 nautical mile equals 1 arc-minute of latitude). Road and everyday speeds almost always use km/h or mph instead.

How fast is 100 km/h in mph and m/s?

100 km/h equals approximately 62.14 mph and 27.78 m/s. This is a commonly needed conversion because many speed limits and car specifications are given in km/h in metric countries but compared to mph in the UK and US.

When would I need to convert to metres per second?

Physics and engineering calculations typically require m/s because it is the SI base unit of speed. Wind speed in weather science, fluid velocity in hydraulics, and wave speed in acoustics are all conventionally stated in m/s. Road speeds are usually given in km/h or mph for everyday communication.