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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