Everyday Life Calculators

Boat Speed Calculator

Calculate a boat’s average speed in knots and miles per hour from distance traveled and time taken.

Speed —

Equivalent speed —

About the Boat Speed Calculator

Boat speed is measured in knots — nautical miles per hour — rather than the statute miles per hour used for land vehicles, since sea and air navigation is based on the nautical mile.

Formula: Speed (knots) = Distance (nautical miles) ÷ Time (hours). One knot equals about 1.15078 miles per hour.

Enter the distance traveled and time taken to find average speed in knots, along with the familiar mph equivalent for comparison.