How do I convert km/h to mph?

Multiply the speed in km/h by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph.

How do I convert mph to km/h?

Multiply the speed in mph by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h.

A knot is one nautical mile per hour, used in aviation and maritime contexts. 1 knot = 1.852 km/h = 1.151 mph.

How fast is 1 m/s in km/h?

1 m/s = 3.6 km/h. To convert m/s to km/h, multiply by 3.6.

What is the difference between m/s and ft/s?

Both measure speed in distance per second, but use different length units. 1 m/s = 3.281 ft/s.

Speed Converter

Convert speeds between kilometres per hour (km/h), miles per hour (mph), metres per second (m/s), feet per second (ft/s), and knots. Instant and bidirectional.

Speed Value

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How to Use

Step 1: Enter the speed value you want to convert.

Step 2: Select the unit to convert from and the unit to convert to.

The result updates instantly. Use the swap button to reverse the conversion direction.

How It Works

Speed measures how fast an object moves. Different fields use different units: km/h for most of the world, mph in the US and UK, m/s in physics, ft/s in engineering, and knots in aviation and maritime contexts.

Conversion factors (based on km/h):

1 km/h = 0.621371 mph = 0.277778 m/s = 0.911344 ft/s = 0.539957 knots

Example: 100 km/h = 62.14 mph = 27.78 m/s = 91.13 ft/s = 54.00 knots.

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