Q:

# What is 18 knots in miles per hour?

A:

Knots are the unit of measurement that describes the speed of boats and airplanes. One knot is equal to roughly 1.151 miles per hour. With this conversion factor, 18 knots is equal to roughly 20.718 miles per hour.

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Credit: Kai Tirkkonen Folio Images Getty Images

One knot is equal to a nautical mile per hour. The term "knot" comes from a historical practice of using a tool known as a "chip log" to calculate a ship's speed. Sailors threw this tool into the water behind ships as they sailed, allowing a knotted rope to unwind freely. After a set amount of time, they would rewind the tool and count the number of knots that unwound.

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