Knots to miles per hour conversion table
Every row is computed with the exact factor the converter above uses:
1 kn = 1.150779 mph (mph = kn × 1.150779).
Looked-up values are rounded to 1 decimal;
type any amount into the tool for other knots values.
| kn | mph |
|---|---|
| 1 kn | 1.2 mph |
| 2 kn | 2.3 mph |
| 3 kn | 3.5 mph |
| 4 kn | 4.6 mph |
| 5 kn | 5.8 mph |
| 6 kn | 6.9 mph |
| 7 kn | 8.1 mph |
| 8 kn | 9.2 mph |
| 9 kn | 10.4 mph |
| 10 kn | 11.5 mph |
| 11 kn | 12.7 mph |
| 12 kn | 13.8 mph |
| 13 kn | 15 mph |
| 14 kn | 16.1 mph |
| 15 kn | 17.3 mph |
| 16 kn | 18.4 mph |
| 17 kn | 19.6 mph |
| 18 kn | 20.7 mph |
| kn | mph |
|---|---|
| 19 kn | 21.9 mph |
| 20 kn | 23 mph |
| 21 kn | 24.2 mph |
| 22 kn | 25.3 mph |
| 23 kn | 26.5 mph |
| 24 kn | 27.6 mph |
| 25 kn | 28.8 mph |
| 26 kn | 29.9 mph |
| 27 kn | 31.1 mph |
| 28 kn | 32.2 mph |
| 29 kn | 33.4 mph |
| 30 kn | 34.5 mph |
| 35 kn | 40.3 mph |
| 40 kn | 46 mph |
| 45 kn | 51.8 mph |
| 50 kn | 57.5 mph |
| 55 kn | 63.3 mph |
| 60 kn | 69 mph |
| kn | mph |
|---|---|
| 65 kn | 74.8 mph |
| 70 kn | 80.6 mph |
| 75 kn | 86.3 mph |
| 80 kn | 92.1 mph |
| 85 kn | 97.8 mph |
| 90 kn | 103.6 mph |
| 100 kn | 115.1 mph |
| 110 kn | 126.6 mph |
| 120 kn | 138.1 mph |
| 130 kn | 149.6 mph |
| 150 kn | 172.6 mph |
| 175 kn | 201.4 mph |
| 200 kn | 230.2 mph |
| 250 kn | 287.7 mph |
| 300 kn | 345.2 mph |
| 400 kn | 460.3 mph |
| 500 kn | 575.4 mph |
A weather report says winds are gusting to 35 knots and you want that in mph to know what you’re dealing with. 1 knot = 1.15078 mph, so 35 knots is about 40.3 mph. This converter runs that multiplication the instant you type, no decoding required.
A knot isn’t a mysterious unit, it’s just one nautical mile per hour. The catch is that a nautical mile (1.852 km) is longer than the statute mile you drive in, which is why one knot edges out one mph. Multiply knots by roughly 1.15 and you’ve got mph. So 10 knots is 11.5 mph, 20 knots is 23.0 mph, and a brisk 50 knots works out to 57.5 mph.
Where knots show up
Three worlds run on knots, and converting to mph makes them intuitive if you think in road-speed terms.
Sailing and boating. Boat speed and current are measured in knots by tradition and by chart convention, since nautical charts use nautical miles. A sailboat doing 6 knots is moving at about 6.9 mph, which sounds slow until you remember it’s sustained and silent.
Aviation. Aircraft airspeed and wind are quoted in knots almost universally. A small plane cruising at 120 knots is doing roughly 138 mph, and an airliner’s 250 knot approach speed is about 288 mph. Pilots stick with knots because navigation math lines up neatly with latitude (one nautical mile equals one minute of arc).
Wind speed. Marine and aviation forecasts report wind in knots. A 25 knot wind is around 28.8 mph, which on the Beaufort scale is a strong breeze, enough to make umbrellas useless.
Speeds you’ll meet
A few conversions cover most cases:
| Knots | mph | Context |
|---|---|---|
| 10 | 11.5 | Moderate wind, cruising sailboat |
| 25 | 28.8 | Strong breeze |
| 50 | 57.5 | Gale, fast powerboat |
| 64 | 73.6 | Hurricane-force threshold |
| 120 | 138.1 | Light aircraft cruise |
The dense table above the tool lays out every step from 1 knot up, with a free field for any value you enter.
How to use it
Type a value in knots and read the mph result instantly. No submit step. The reference table covers the common speeds, so for standard figures you can read it straight off. All math runs in your browser using the exact 1.15078 factor, so nothing you enter gets uploaded and it keeps working offline once the page loads.
One unit note to keep straight: a knot is a nautical mile per hour, not a kilometer or a statute mile per hour. People sometimes say “knots per hour,” which is a mistake, since the “per hour” is already baked into the word. A knot is a speed, full stop.
FAQ
How many mph is a knot?
1.15078 mph. A knot is one nautical mile per hour, and a nautical mile (1.852 km) is longer than a statute mile, so a knot is a bit faster than a mph.
Why do boats and planes use knots instead of mph?
Because navigation runs on nautical miles, which tie directly to latitude (one nautical mile equals one minute of arc). That makes chart and position math cleaner, so the maritime and aviation worlds kept knots.
Is “knots per hour” correct?
Nope. A knot already means one nautical mile per hour, so “knots per hour” would be speed per hour, which is acceleration. Just say knots.
What’s 30 knots in mph?
About 34.5 mph. Thirty knots is a near-gale wind or a fast powerboat, and multiplying by 1.15078 gives the mph figure.
What’s 64 knots in mph?
73.6 mph. Sixty-four knots is the sustained-wind threshold where a tropical storm officially becomes a hurricane, which is why forecasters watch that exact number.
How fast is 20 knots in mph?
23.0 mph. That’s a typical fast-cruise speed for a mid-size powerboat, and doubling to 40 knots gets you 46.0 mph.
Does this send my data anywhere?
No. It’s plain browser arithmetic with a fixed multiplier. Your values stay local, and it runs offline once the page has loaded.