How do I convert km/h to mph?

Divide by 1.609344, or multiply by 0.6214. 100 km/h is 62.14 mph, and 70 mph is 112.65 km/h.

What is a knot in km/h?

One knot is 1.852 km/h or 1.1508 mph, because it is one nautical mile per hour. Ships and aircraft use knots since a nautical mile matches one minute of latitude on charts.

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

Multiply by 3.6, since there are 3,600 seconds in an hour and 1,000 metres in a kilometre. A sprinter at 10 m/s is running at 36 km/h.

Speed

km/h, mph, knots and metres per second.

About Speed

Convert a speed between metres per second, kilometres per hour, miles per hour, feet per second and knots. Every other unit is shown as you type.

How to use

Type a value and pick its unit. The default is 1 km/h.
Every other unit updates as you type; each row has its own Copy button, and Copy on the panel copies the whole table.
Results are rounded to eight decimal places and formatted for your locale.

Conversion factors

All units convert through metres per second:

Unit	Metres per second
kilometre per hour	1 / 3.6
mile per hour	0.44704
foot per second	0.3048
knot	0.51444444444

The mph and ft/s factors are exact (from the 1959 international yard); a knot is one nautical mile (1,852 m) per hour. The value must be greater than zero.

Example

100 km/h → 27.77777778 m/s · 62.13711922 mph · 53.99568035 kn · 91.13444153 ft/s

Privacy

Runs in the browser. No request is made, and nothing is stored.

Frequently asked questions

How do I convert km/h to mph?: Divide by 1.609344, or multiply by 0.6214. 100 km/h is 62.14 mph, and 70 mph is 112.65 km/h.
What is a knot in km/h?: One knot is 1.852 km/h or 1.1508 mph, because it is one nautical mile per hour. Ships and aircraft use knots since a nautical mile matches one minute of latitude on charts.
How do I convert m/s to km/h?: Multiply by 3.6, since there are 3,600 seconds in an hour and 1,000 metres in a kilometre. A sprinter at 10 m/s is running at 36 km/h.

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