What Is the Wind Speed Unit Converter?
This tool converts a wind speed value between the four units used most often in weather, aviation, and sailing: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), and knots (kn). Enter any speed, choose the unit you have, and instantly see the equivalent in all four units. The conversions are universal physical relationships, so this tool applies worldwide.
How to Use It
Type the wind speed number into the field, pick the unit it is measured in from the dropdown, and submit. The result shows the value in m/s as the headline, followed by a table listing km/h, mph, knots, and m/s side by side so you can read off whichever you need.
The Formula Explained
The converter uses meters per second as a base. To convert your input to m/s, it divides by the unit's factor (3.6 for km/h, 2.23694 for mph, 1.94384 for knots; m/s stays as-is). From m/s it then multiplies by each factor:
$$\text{km/h} = \text{m/s} \times 3.6, \quad \text{mph} = \text{m/s} \times 2.23694, \quad \text{knots} = \text{m/s} \times 1.94384.$$ The factor \(3.6\) comes from 3600 seconds per hour divided by 1000 meters per kilometer. One knot equals one nautical mile (1852 m) per hour.
Worked Example
Suppose a weather station reports a wind speed of 10 m/s. Then $$\text{km/h} = 10 \times 3.6 = 36 \text{ km/h},$$ $$\text{mph} = 10 \times 2.23694 = 22.37 \text{ mph},$$ and $$\text{knots} = 10 \times 1.94384 = 19.44 \text{ kn}.$$ A 10 m/s wind is therefore a moderate breeze of about 36 km/h.
FAQ
Why are knots used in sailing and aviation? A knot is one nautical mile per hour, and nautical miles correspond neatly to one minute of latitude, which makes navigation calculations easier.
Is 1 m/s exactly 3.6 km/h? Yes, this is an exact conversion. The mph and knot factors are rounded to five significant figures.
How fast is hurricane-force wind? Hurricane force begins at about 32.7 m/s, which is roughly 118 km/h, 73 mph, or 64 knots.
