Feet per Second to Millimeter per Second Converter
Convert a speed written in feet per second into millimeters per second. The foot is defined exactly in meters, so the conversion is a clean multiplication.
Formula: mm/s = ft/s x 304.8. Reverse it with millimeter per second to feet per second.
From field-speed notes to machine-scale numbers
Feet per second can appear in older specs, test notes, or regional documents. Millimeters per second feels more natural for small motion systems, actuators, and equipment interfaces where the movement is read at a finer scale. Multiplying by 304.8 moves the same speed into that smaller metric unit.
| ft/s | mm/s | Quick read |
|---|---|---|
| 1 | 304.8 | The core anchor |
| 5 | 1,524 | Easy exact check |
| 10 | 3,048 | Default example |
The slash matters here: ft/s and mm/s are speed units, not plain length units. If you need neighboring conversions, use feet per second to meters per second, feet per second to kmph, or fps to mph. More options live in the speed converter section.