How to convert knots to miles per hour
- Take the value in knots.
- Use the formula miles per hour = knots × 1.150779448.
- For example, 1 kn is 1.15 mph.
About knots and miles per hour
A knot is one nautical mile per hour. A nautical mile is 1,852 m against 1,609.344 m for a land mile, so 1 knot is 1.15078 mph. Multiply knots by 1.15078 to get mph, or add 15% for a quick estimate.
Ships, aircraft and marine weather forecasts use knots. Hurricane advisories and aviation charts are issued in knots, while US news and road users think in miles per hour.
Examples
- 1 kn (one knot) is 1.15 mph
- 34 kn (the start of tropical storm strength) is 39.13 mph
- 64 kn (the start of hurricane strength) is 73.65 mph
- 250 kn (the US speed limit for aircraft below 10,000 ft) is 287.69 mph
Knots to miles per hour chart
| Knots (kn) | Miles per hour (mph) |
|---|---|
| 1 | 1.15 |
| 2 | 2.3 |
| 3 | 3.45 |
| 4 | 4.6 |
| 5 | 5.75 |
| 6 | 6.9 |
| 8 | 9.21 |
| 10 | 11.51 |
| 12 | 13.81 |
| 15 | 17.26 |
| 20 | 23.02 |
| 25 | 28.77 |
| 30 | 34.52 |
| 34 | 39.13 |
| Knots (kn) | Miles per hour (mph) |
|---|---|
| 35 | 40.28 |
| 40 | 46.03 |
| 50 | 57.54 |
| 60 | 69.05 |
| 64 | 73.65 |
| 70 | 80.55 |
| 80 | 92.06 |
| 100 | 115.08 |
| 150 | 172.62 |
| 200 | 230.16 |
| 250 | 287.69 |
| 300 | 345.23 |
| 400 | 460.31 |
| 500 | 575.39 |