Speed Converter

Enter a speed to convert between km/h, mph, metres per second and knots.

Results

1 mph =
1.609344 km/sa
Metres per second
0.44704 m/s
Knot
0.86897624 kn
Feet per second
1.4666667 ft/s
1 mph in km/sa
1.609344

Road signs in the US and UK show miles per hour, sailors and pilots use knots, and physics works in metres per second. This converter handles five units of speed.

1 mph is 1.609 km/h. To turn metres per second into km/h, multiply by 3.6. A knot is one nautical mile per hour — 1.852 km/h.

How to calculate Speed conversion

  1. Enter the speed.
  2. Choose the units to convert from and to.
  3. Read the result and the same speed in the other units.

Speed conversion formula

  • 1 mph = 1.609344 km/h
  • 1 m/s = 3.6 km/h
  • 1 knot = 1.852 km/h

Speed conversion example

A 65 mph speed limit is 65 × 1.609344 = 104.6 km/h. A 10 m/s wind is blowing at 36 km/h.

Speed conversion: common questions

What is 100 km/h in mph?

About 62.1 mph.

Why are knots used?

A nautical mile is one minute of latitude, which makes navigation on a chart far simpler.

How do I convert m/s to km/h?

Multiply by 3.6. To go the other way, divide km/h by 3.6.