How To Convert Knots to Miles per Hour
Formula: mph = knots × 1.150779448
Example: Convert 18 knots to miles per hour.
18 × 1.150779448 = 20.714030064 mph
To convert knots to mph by hand, multiply the knot value by 1.150779448.
If you have a calculator, type the knots number, then multiply by 1.150779448.
This works for whole numbers and decimals the same way.
Quick Answer
1 knot = 1.150779448 mph
- 10 knots = 11.50779448 mph
- 25 knots = 28.7694862 mph
- 60 knots = 69.04676688 mph
Conversion Formula
miles per hour (mph) = knots (kn) × 1.150779448
This means you take the speed in knots and scale it up by 1.150779448 to get the same speed in miles per hour.
Why that number, A knot is one nautical mile per hour. A nautical mile is longer than a mile, so mph is always a bit higher than knots for the same speed.
- Write down the speed in knots.
- Multiply it by 1.150779448.
- The result is the speed in miles per hour.
Knot
A knot is a unit of speed equal to one nautical mile per hour. Its symbol is kn.
It became common in sea navigation because nautical miles match Earth mapping and latitude measurements. It was later standardized so everyone uses the same value.
- Ship and boat speeds
- Wind speed over the ocean
- Aviation speed reporting
- Weather and marine forecasts
- Tidal current speeds
Mile per hour
A mile per hour is a unit of speed showing how many miles are traveled in one hour. Its symbol is mph.
It grew from the use of the mile in road distances and became a standard speed unit for travel. Today, it is widely used for road vehicles and everyday speed limits.
- Car and motorcycle speeds
- Road speed limits
- Running and cycling speed checks
- Sports timing and pacing
- General weather reports in some countries
Is this Conversion of Knots To Miles per Hour Accurate?
Yes. This conversion is based on exact, internationally used definitions. A knot is defined as 1 nautical mile per hour. A nautical mile is defined as 1,852 meters, and an international mile is defined as 1,609.344 meters. Using these fixed values gives the constant 1 knot = 1.150779448 mph, which is consistent with navigation and aviation standards.
To learn how we choose and verify constants like this, see our accuracy standards.
Real Life Examples
Knots are common on water and in aviation, but many people think in mph. Here are realistic examples using the same standard conversion.
- Small fishing boat: Cruising at 6 knots is 6 × 1.150779448 = 6.904676688 mph.
- Marine weather report: Wind at 20 knots is 20 × 1.150779448 = 23.01558896 mph.
- Medium cruise ship: A service speed of 22 knots is 22 × 1.150779448 = 25.317147856 mph.
- Sailing race: A sailboat doing 12 knots is 12 × 1.150779448 = 13.809353376 mph.
- Tidal current: A current of 3.5 knots is 3.5 × 1.150779448 = 4.027728068 mph.
- Fast jet ski pace: 35 knots is 35 × 1.150779448 = 40.27728068 mph.
- Strong headwind for a plane: 45 knots is 45 × 1.150779448 = 51.78507516 mph.
Quick Tips
- For a fast estimate, add about 15 percent to the knots value to get mph.
- 10 knots is exactly 11.50779448 mph, use it as a quick reference point.
- If you double knots, you also double mph, the conversion factor stays the same.
- For better accuracy, keep a few decimals while multiplying, then round at the end.
- Remember, mph will always be larger than knots for the same speed.