# Convert Knot to Foot/second

Please provide values below to convert knot [kt, kn] to foot/second [ft/s], or *vice versa*.

### Knot

**Definition:** A knot (symbol: kn or kt) is a non-SI unit of speed at sea. It is defined as one nautical mile per hour, where a nautical mile is 1,852 meters. A knot is equal to 1.852 kilometers per hour and 1.15078 miles per hour.

**History/origin:** The term "knot" is derived from its former use as a measure on the log lines on ship logs (a navigation tool) which were used to measure ship speed through water. Knots would be tied into the rope on these lines at uniform intervals of approximately 47 feet, or 14.3 meters long.

The knot has had various definitions throughout history. The United States and United Kingdom in particular used their own specific nautical miles up until 1954 and 1970 respectively. The US nautical mile is defined as 1,853.248 m while the UK Admiralty nautical mile is equal to 1853.184 m, compared to the international nautical mile of 1,852 m.

**Current use:** The knot is used worldwide in meteorology as well as in maritime and air navigation as a measure of speed of a vessel relative to the fluids in which they travel. Tidal streams, river currents, and wind speeds are also measured using knots.

### Feet per second

**Definition:** A foot per second (symbol: ft/s) is a unit of speed and velocity that expresses the time taken in seconds to travel a specific distance in feet. It is equal to 0.3048 meters per second, the International System of Units (SI) derived unit of speed and velocity. It is also equal to 0.592484 knots and 0.681818 miles per hour.

**History/origin:** The foot per second is a measurement based in systems like the imperial and United States customary systems of units, where the foot is the preferred unit of length.

**Current use:** The foot per second is not widely used. The meter per second is the preferred measurement in scientific contexts, and either miles per hour or kilometers per hour are more common in everyday use for describing road speeds. The foot per second is also a relatively small unit of measurement making it difficult for use on a larger scale.

### Knot to Foot/second Conversion Table

Knot [kt, Kn] | Foot/second [ft/s] |
---|---|

0.01 kt, kn | 0.0168780986 ft/s |

0.1 kt, kn | 0.1687809857 ft/s |

1 kt, kn | 1.6878098571 ft/s |

2 kt, kn | 3.3756197142 ft/s |

3 kt, kn | 5.0634295713 ft/s |

5 kt, kn | 8.4390492855 ft/s |

10 kt, kn | 16.878098571 ft/s |

20 kt, kn | 33.756197142 ft/s |

50 kt, kn | 84.3904928551 ft/s |

100 kt, kn | 168.7809857101 ft/s |

1000 kt, kn | 1687.8098571012 ft/s |

### How to Convert Knot to Foot/second

1 kt, kn = 1.6878098571 ft/s

1 ft/s = 0.5924838013 kt, kn

**Example:** convert 15 kt, kn to ft/s:

15 kt, kn = 15 × 1.6878098571 ft/s = 25.3171478565 ft/s