Speed converter

km/h, mph, m/s and knots.

Speed to convert

km/h

From

Result

0.621371 mph

1 km/h is 0.621371 mph.

How it works

For driving abroad, reading sailing and aviation figures, and turning athletic performances into everyday numbers.

Result = Value × (Factor of source unit ÷ Factor of target unit), in metres per second

Example: A 110 km/h motorway limit is 68 mph. A 100 m sprint in 10 s averages 36 km/h.

How do I convert km/h to mph in my head?

Multiply by 6 and drop a zero — 120 km/h becomes 72, close to the true 74.6 mph.

What is a knot?

One nautical mile per hour, or 1.852 km/h. It is used at sea and in the air because it maps neatly onto lines of latitude.

How is speed related to pace?

Pace is the inverse: minutes per kilometre or mile. A 12 km/h run is a 5:00 min/km pace.