The knot (/nɒt/) is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.15078 mph. The ISO Standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE); kt is also common.
| Definition | Relation to SI units |
|---|---|
≡ 1 nmi/h = 1.852 km/h = 1852m/3600s |
| yard per hour | inch per minute | yard per minute | foot per minute | inch per hour | inch per second | mile per minute | foot per hour |
|---|---|---|---|---|---|---|---|
| 1 | 0.6 | 0.0166667 | 0.05 | 36 | 0.01 | 9.469696969697 × 10-6 | 3 |
| 1.6666667 | 1 | 0.0277778 | 0.0833333 | 60 | 0.0166667 | 1.5782828282828 × 10-5 | 5 |
| 60 | 36 | 1 | 3 | 2 160 | 0.6 | 0.0005682 | 180 |
| 20 | 12 | 0.3333333 | 1 | 720 | 0.2 | 0.0001894 | 60 |
| 0.0277778 | 0.0166667 | 0.0004630 | 0.0013889 | 1 | 0.0002778 | 2.6304713804714 × 10-7 | 0.0833333 |
| 100 | 60 | 1.6666667 | 5 | 3 600 | 1 | 0.0009470 | 300 |
| 105 600 | 63 360 | 1 760 | 5 280 | 3 801 600 | 1 056 | 1 | 316 800 |
| 0.3333333 | 0.2 | 0.0055556 | 0.0166667 | 12 | 0.0033333 | 3.1565656565657 × 10-6 | 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
| 1 knots | = 0.51444444444444 meters per second |
| 2 knots | = 1.0288888888889 meters per second |
| 3 knots | = 1.5433333333333 meters per second |
| 4 knots | = 2.0577777777778 meters per second |
| 5 knots | = 2.5722222222222 meters per second |