Back to the blog

Calculators

How to convert mph to km/h, and knots.

A mile an hour is exactly 1.609344 km/h. How to convert speed limits and speeds between mph and km/h, with metres a second and knots.

By 3 min read

The Unit converter reading 5 ft 11 in to cm and answering exactly 180.34 cm, beside a ruler marked in inches and centimetres

Speeds convert by the same factor as distances, since the hours are the same on both sides.

Multiply by 1.609344.

60 mph is exactly 96.56064 km/h, and 100 km/h is about 62.1371 mph. A knot, a nautical mile an hour, is exactly 1.852 km/h.

Metres a second.

Physics problems use metres a second: divide km/h by 3.6. The converter lists every speed unit under the answer.

Typing a speed.

Type km/h, kmh, kph or kmph and mph or miles per hour; the converter reads them all. 3 kmph to mph gives about 1.86411 mph.

Further reading

Topics: mph to kmh · kmh to mph · mph to km/h · kph to mph · knots to mph · speed converter

A little less theory. A little more doing.

Try it on your own terms, with a free browser tool.

Try the tool