# Convert ft/s to mm/s, mm/s to ft/s - Speed Conversion

Use these **online** calculators to convert between feet per second (ft/s) and millimeters per second (mm/s). These Speed conversion calculators provide a quick and easy way to convert:

- ft/s to mm/s
- mm/s to ft/s

## Conversion Calculators

Enter your value in one of the conversion calculators below to **convert ft/s to mm/s** or **convert mm/s to ft/s**.

## Convert ft/s to mm/s

## Convert mm/s to ft/s

**How to convert ft/s to mm/s**: Use the conversion calculator on the left titled "Convert ft/s mm/s". Enter a value in the ft/s field and click on the "Calculate mm/s" button. Your answer will appear in the mm/s field.

**How to convert mm/s to ft/s**: Use the conversion calculator on the right titled "Convert mm/s to ft/s". Enter a value in the mm/s field and click on the "Calculate ft/s" button. Your answer will appear in the ft/s field.

## Conversion Definitions

The following is a list of definitions relating to conversions between feet per second and millimeters per second.

### What are feet per second (ft/s)?

Feet per second is a unit of speed in both US Customary Units as well as the Imperial System. It measures the number of feet travelled in a second. The symbol for feet per second is ft/s.

### What are millimeters per second (mm/s)?

Millimeters per second is a unit of speed in the Metric System. It measures the number of millimeters travelled in a second. The symbol for millimeters per second is mm/s and the International spelling is millimetres per second.

### Understanding the Speed Units

This table provides a summary of the Speed units within their respective measurement systems.

Unit | Symbol | Measurement System | Description |
---|---|---|---|

inches per second | in/s | US Customary Units (and Imperial) | |

feet per second | ft/s | US Customary Units (and Imperial) | 1 ft/s = 12 in/s |

yards per second | yd/s | US Customary Units (and Imperial) | 1 yd/s = 3 ft/s |

miles per second | mi/s | US Customary Units (and Imperial) | 1 mi/s = 1760 yd/s 1 mi/s = 5280 ft/s |

millimeters per second | mm/s | Metric System | 1000 mm/s = 1 m/s |

centimeters per second | cm/s | Metric System | 100 cm/s = 1 m/s 1 cm/s = 10 mm/s |

decimeters per second | dm/s | Metric System | 10 dm/s = 1 m/s 1 dm/s = 10 cm/s |

meters per second | m/s | Metric System | 1 m/s = 1000 mm/s 1 m/s = 100 cm/s 1 m/s = 10 dm/s |

kilometers per second | km/s | Metric System | 1 km/s = 1000 m/s |