Knots to MPH Converter
One Knot Is a Nautical Mile per Hour, Nothing More
A knot is simply a speed of one nautical mile per hour — and because a nautical mile (1,852 m) is longer than a statute mile (1,609.344 m), a given knot figure is always a somewhat larger number in miles per hour. This calculator converts cleanly in both directions using that exact ratio.
The Formulas
mph = knots × 1.150779
knots = mph / 1.150779
knots = mph / 1.150779
Common Speed Conversions
| Knots | MPH |
|---|---|
| 5 | 5.75 |
| 10 | 11.51 |
| 15 | 17.26 |
| 20 | 23.02 |
| 30 | 34.52 |
The conversion factor, 1.150779, comes directly from dividing the nautical mile (1,852 m) by the statute mile (1,609.344 m) — it's an exact ratio, not a rounded approximation.
Where This Matters
- Weather forecasts — marine forecasts typically report wind speed in knots, while general public forecasts use mph; converting lets the two be compared directly.
- Boat speed specs — manufacturer speed claims sometimes mix units between markets, so converting to a single consistent unit avoids apples-to-oranges comparisons.
- Aviation and marine crossover — pilots and mariners both routinely work in knots, so this conversion also comes up translating wind or speed figures for a land-based audience.
How to Use This Calculator
- Choose the mode: Knots to MPH or MPH to Knots.
- Enter the Speed value in the selected unit.
- Select Calculate to see the converted speed.
Related Calculations
Convert distance units with the Nautical Mile Converter, or apply a converted speed to a route with the Marine Distance Calculator.