Length
Convert foot (ft) to millimetre (mm). Length units span pipe diameters (mm, inch), plant dimensions (m, ft), and roughness (µm) — mixing metric and imperial is routine.
1 ft = 304.8 mm
To convert foot to millimetre, multiply the ft value by 304.8. To go the other way, divide by 304.8 (or multiply by 0.00328084).
| ft | mm |
|---|---|
| 1 | 304.8 |
| 2 | 609.6 |
| 5 | 1524 |
| 10 | 3048 |
| 25 | 7620 |
| 50 | 15240 |
| 100 | 30480 |
| 250 | 76200 |
| 500 | 152400 |
| 1000 | 304800 |
Pipe sizes are labelled in inches (NPS) but calculated in mm; equipment layouts mix metres and feet.
Velocity scales with the inverse square of diameter, so a small length error compounds quickly in flow calculations.
Worked example. A length of 0.328084 ft is 100 mm.
Multiply the value in ft by 304.8 to get mm. For example, 10 ft = 3048 mm.
1 ft equals 304.8 mm.
Pipe sizes are labelled in inches (NPS) but calculated in mm; equipment layouts mix metres and feet.