## Definitions

### Miles per hour

Mile per hour is a unit of speed defined in the Imperial and US customary systems of units. It measures the number of miles an object travels within an hour. International mile [mi] is a unit of length, equal to 5280 feet and precisely defined as 1609.344 meters. The symbol more commonly used on signs and labels is the abbreviation mph, however in science and engineering contexts, mi/h may be more convenient for unit arithmetic.

The relationships between the miles per hour and some other speed units, native to the Imperial/US customary and SI systems, are shown in the following table:

Unit | Symbol | [mph] |
---|---|---|

Inch per second | ips | \(\frac{3600}{63,360}=\frac{5}{88}\) |

Inch per minute | ipm | \(\frac{60}{63,360}=\frac{1}{1056}\) |

Inch per hour | iph | \(\frac{1}{63,360}\) |

Feet per second | fps | \(\frac{3600}{5280}=\frac{15}{22}\approx 0.681818\) |

Feet per minute | fpm | \(\frac{60}{5280}=\frac{1}{88}\) |

Feet per hour | fph | \(\frac{1}{5280}\) |

Miles per second | mps | \(3600\) |

Miles per minute | mpm | \(60\) |

Meters per second | m/s | \(\frac{3600}{1609.344}\approx 2.2369 \) |

Kilometers per hour | km/h | \(\frac{1}{1.609344}\approx 0.62137 \) |

### Feet per second

Foot per second is a unit of speed defined in the Imperial and US customary systems of units. It measures the number of feet an object travels within a second. Foot [ft] is a unit of length, precisely defined as equal to 0.3048 meters.

The relationships between the foot per second and some other speed units, native to the Imperial/US customary and SI systems, are shown in the following table:

Unit | Symbol | [fps] |
---|---|---|

Inch per second | ips | \(\frac{1}{12}\) |

Inch per minute | ipm | \(\frac{1}{720}\) |

Inch per hour | iph | \(\frac{1}{43,200}\) |

Feet per minute | fpm | \(\frac{1}{60}\) |

Feet per hour | fph | \(\frac{1}{3600}\) |

Miles per second | mps | \(5280\) |

Miles per minute | mpm | \(88\) |

Miles per hour | mph | \(\frac{5280}{3600}=\frac{22}{15}\approx 1.46667\) |

Meters per second | m/s | \(\frac{1}{0.3048}\approx 3.2808 \) |

Kilometers per hour | km/h | \(\frac{1}{3.6\cdot 0.3048}\approx 0.91134 \) |

### How to convert miles per hour to feet per second

- Multiply speed in mph with 5280
- Divide the result by 3600
- The result is the speed in feet per second

For example 60 mph is: 60x5280/3600 = 88 fps

### How to convert feet per second to miles per hour

- Multiply speed in fps with 3600
- Divide the result by 5280
- The result is the speed in mph

For example 99 fps is: 99*3600/5280 = 67.5 mph

### Conversion table from [mph] to [fps]

In the following table some typical speeds in miles per hour are converted to feet per second:

[mph] | [fps] |
---|---|

1 | |

2 | |

5 | |

10 | |

15 | |

20 | |

25 | |

30 | |

35 | |

40 | |

45 | |

50 | |

55 | |

60 | |

65 | |

70 | |

80 | |

90 | |

100 | |

120 | |

200 |

### Conversion table from [fps] to [mph]

In the following table some typical speeds in feet per second are converted to miles per hour:

[fps] | [mph] |
---|---|

1 | |

5 | |

10 | |

20 | |

30 | |

40 | |

50 | |

60 | |

70 | |

80 | |

90 | |

100 | |

110 | |

120 | |

130 | |

140 | |

150 | |

160 | |

180 | |

200 | |

300 |