One knot is one nautical mile per hour, and a nautical mile is exactly 1,852 m. That makes a knot 1.15078 mph or 1.852 km/h.
| knots | mph | mph | knots |
|---|---|---|---|
| 1 | 1.151 | 1 | 0.869 |
| 5 | 5.754 | 5 | 4.345 |
| 10 | 11.508 | 10 | 8.69 |
| 20 | 23.016 | 25 | 21.724 |
| 30 | 34.523 | 40 | 34.759 |
| 50 | 57.539 | 60 | 52.139 |
| 100 | 115.078 | 100 | 86.898 |
| 500 | 575.39 | 600 | 521.386 |