Knots to MPH Converter
Convert knots (kn) to miles per hour (mph) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
Knots to mph formula
mph = kn × 1.150779448
1 knot = 1.15 miles per hour · 1 mile per hour = 0.869 knots
To convert knots to miles per hour, multiply the value by 1.150779448. For example, 20 kn:
mph = 20 × 1.150779448mph = 23.015589
So 20 kn = 23.02 mph.
Mental math shortcut
Quick mental estimate: add 15%. For 20 kn that gives about 23 mph — within 1% of the exact answer. Use the exact formula when precision matters.
Knots to mph conversion table
mph back to Knots
The same values converted the other way, rounded for everyday use:
| Miles per hour | Knots |
|---|---|
| 1.15 mph | 0.9993 kn |
| 5.75 mph | 5 kn |
| 11.51 mph | 10 kn |
| 17.26 mph | 15 kn |
| 23.02 mph | 20 kn |
| 28.77 mph | 25 kn |
| 34.52 mph | 30 kn |
| 46.03 mph | 40 kn |
About the units
Knots (kn)
A knot is one nautical mile (1,852 m) per hour. It is used in aviation, sailing and for wind speed at sea.
Miles per hour (mph)
Miles per hour is the speed unit used on roads in the US and UK.
Frequently asked questions
How many miles per hour are in a knot?
One knot equals 1.15 miles per hour.
What is 20 Knots in mph?
20 kn = 23.02 mph.
How do I convert mph back to Knots?
Divide the miles per hour by 1.150779448.