Convert Knots to MPH and KM/H

Knots and mph are both units used to measure speed but represent slightly different lengths. Understanding how to translate knots into mph or km/h allows for easier speed and distance calculations. This article summarizes the relationship between knots and speed, explains the formulas, and has a handy speed conversion calculator for your to use.

What is a Knot?

A knot is a unit of speed used to measure the travel of a ship or vessel. One knot is equal to one nautical mile per hour. A nautical mile equals 1,852 meters (1.852 km) or 1.15078 statute miles and is based on the measurement of one minute of latitude. 

The nautical mile has been used since 1954 and differs from the statute mile used in the United States and the United Kingdom.

Knots measure the speed of ships and have been historically significant in maritime and aviation navigation. The term “knot” originates from using a rope or log to measure speed at sea. A knot measures the distance a vessel covers in one nautical mile.

Simple Formula for Converting Knots to MPH

The formula to convert between knots, miles per hour (mph), and kilometers per hour (km/h) is:

• 1 knot = 1.15078 mph (knot to mile per hour)
• 1 knot = 1.852 km/h (knot to kilometer per hour)

You can multiply the number of knots by these values to convert to the respective units.

For example:

Knots to MPH: 15 knots×1.15078=17.26 mph

Knots to KM/H: 15 knots×1.852=27.78 km/h

MPH to Knots: 30 mph/1.15078=26.068 knots

KM/H to Knots: 50 km/h/1.852=26.98 knots

Knots to MPH and KMH Calculator

Here is a calculator to help you calculate knots to MPH and KM/H or vice versa.

Enter the desired speed in knots, choose between MPH and KM/H, and click the button to get the results. Want to try again? Click the “Clear” button to reset all fields.