Frequently Asked Questions — Knot to MPH
Question: How many mph is 1 knot?
Answer: 1 knot (kt) = 1.150779448 miles per hour (mph). A knot is one nautical mile per hour, and 1 nautical mile = 1.852 km = 1.15078 miles.
Question: How do I convert knots to mph?
Answer: Multiply the knots by 1.150779448. For example, 20 knots × 1.150779 ≈ 23.02 mph.
Question: What is 20 knots in mph?
Answer: 20 × 1.150779 ≈ 23.02 mph. This is a typical cruising speed for a small sailboat.
Question: What is 30 knots in mph?
Answer: 30 × 1.150779 ≈ 34.52 mph. Fast patrol boats and destroyers often cruise at 30–35 knots.
Question: Why do ships and aircraft use knots instead of mph?
Answer: Knots are tied to nautical miles, which correspond to one minute of arc of latitude. This makes navigation calculations on charts and GPS systems simpler. One knot = 1 nautical mile per hour = 1.852 km/h = 1.15078 mph.