| Abbreviation | Definition |
|---|---|
| fps | foot-pound-second [cf. cgs and mks] |
| FPS | Frags Per Second |
| FPS | Frames Per Second |
| Fr | French |
| fr. | French [gauge] |
| Fr. | French gauge [diameter] |
| FS | Fixed Scale |
| FSL | Fictional Senshi Library |
| FSW | Feet Salt Water |
| FSW | Feet Sea Water |
| FSYU | Federal Sustained Yield Unit |
| ft | feet |
| FT | Foot |
| FT/MIN | Feet per Minute |
| FT² | Feet Squared |
| FT3 | Cubic Feet |
| FT³ | Feet Cubed |
| FT3/(FT2-D) | Cubic Feet per Square-Foot-Day |
| FT3/(FT-D) | Cubic Feet per Foot-Day |
| FT-LB | Foot-Pound |