Mph to knots
One mph equals 0.8689762419 kn. Type any number and the answer appears as you type — the maths happens in your browser.
The same value in every unit
| Unit | Value |
|---|
- Free
- Files never leave your device
- No sign-up
Common values
| mph | knots |
|---|---|
| 1 mph | 0.86897624 kn |
| 2 mph | 1.7379525 kn |
| 3 mph | 2.6069287 kn |
| 5 mph | 4.3448812 kn |
| 10 mph | 8.6897624 kn |
| 15 mph | 13.034644 kn |
| 20 mph | 17.379525 kn |
| 25 mph | 21.724406 kn |
| 50 mph | 43.448812 kn |
| 100 mph | 86.897624 kn |
| 500 mph | 434.48812 kn |
| 1000 mph | 868.97624 kn |
How to use
- Enter the number of mph in the field.
- The result in knots updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: kn = mph ÷ 1.150779448. Going back the other way, one kn is 1.150779448 mph.
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
kn = mph ÷ 1.150779448
Frequently asked questions
How many knots are in one mph?
One mph is 0.8689762419 kn.
How do I convert mph to knots?
Multiply by the factor: kn = mph ÷ 1.150779448.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert knots back to mph?
One kn is 1.150779448 mph — or open the reverse page linked below.