Length
Convert millimetre (mm) to foot (ft). Length units span pipe diameters (mm, inch), plant dimensions (m, ft), and roughness (µm) — mixing metric and imperial is routine.
1 mm = 0.00328084 ft
To convert millimetre to foot, multiply the mm value by 0.00328084. To go the other way, divide by 0.00328084 (or multiply by 304.8).
| mm | ft |
|---|---|
| 1 | 0.00328084 |
| 2 | 0.00656168 |
| 5 | 0.0164042 |
| 10 | 0.0328084 |
| 25 | 0.082021 |
| 50 | 0.164042 |
| 100 | 0.328084 |
| 250 | 0.82021 |
| 500 | 1.64042 |
| 1000 | 3.28084 |
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 100 mm is 0.328084 ft.
Multiply the value in mm by 0.00328084 to get ft. For example, 10 mm = 0.0328084 ft.
1 mm equals 0.00328084 ft.
Pipe sizes are labelled in inches (NPS) but calculated in mm; equipment layouts mix metres and feet.