Knots to MPH Converter
Convert knots to mph instantly. Enter a speed in knots to get miles per hour using the 1.15078 factor, with the reverse mph to knots direction shown.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Knots to MPH Converter Works
This tool converts knots (kn) to miles per hour (mph) and back. A knot is one nautical mile per hour, the standard speed unit in shipping, aviation and meteorology. Miles per hour is the familiar land-speed unit in the US and UK.
The Formula
MPH = knots × 1.15078 Knots = mph ÷ 1.15078
The factor comes from the nautical mile (1.852 km) being about 15 percent longer than a statute mile (1.609 km).
Worked Example
Convert 20 knots (a brisk sailing breeze) to mph:
- mph = 20 × 1.15078 = 23.02 mph
A strong wind of 30 knots:
- 30 × 1.15078 = 34.5 mph
Going the other way, 60 mph in knots:
- knots = 60 ÷ 1.15078 = 52.1 knots
Knots to MPH Quick Reference
| Knots | MPH |
|---|---|
| 5 | 5.75 |
| 10 | 11.51 |
| 20 | 23.02 |
| 30 | 34.52 |
| 50 | 57.54 |
Where You Use This Conversion
Knots appear in marine weather forecasts, boating and sailing, aviation and hurricane wind speeds. Since most people think in mph on land, converting helps you judge how strong a 25-knot wind really is, or how fast a vessel cruising at 18 knots is moving. The reverse direction is handy when a land speed needs to be expressed for a boat or aircraft.
Frequently asked questions
How many mph is 1 knot?+
One knot equals about 1.15078 miles per hour. So 20 knots is about 23 mph. To convert knots to mph, multiply by 1.15078.
How do I convert knots to mph?+
Multiply the knot value by 1.15078. For example, 20 knots × 1.15078 = 23.02 mph. To reverse it, divide mph by 1.15078 to get knots.
What is 30 knots in mph?+
30 knots equals about 34.5 mph. Wind and boat speeds are often given in knots, so converting to mph makes them easier to picture for drivers.
What is a knot?+
A knot is one nautical mile per hour. A nautical mile is based on the circumference of the Earth and equals 1.852 km, which is why a knot is slightly faster than a regular mile per hour.
Why do ships and planes use knots?+
Knots tie directly to nautical miles and latitude, which makes navigation by chart and longitude or latitude lines simpler at sea and in the air. The unit has stuck for maritime and aviation use.