Length
Convert inch (in) to kilometre (km). Length units span pipe diameters (mm, inch), plant dimensions (m, ft), and roughness (µm) — mixing metric and imperial is routine.
1 in = 2.54e-5 km
To convert inch to kilometre, multiply the in value by 2.54e-5. To go the other way, divide by 2.54e-5 (or multiply by 39370.08).
| in | km |
|---|---|
| 1 | 2.54e-5 |
| 2 | 5.08e-5 |
| 5 | 0.000127 |
| 10 | 0.000254 |
| 25 | 0.000635 |
| 50 | 0.00127 |
| 100 | 0.00254 |
| 250 | 0.00635 |
| 500 | 0.0127 |
| 1000 | 0.0254 |
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 3.937008 in is 0.0001 km.
Multiply the value in in by 2.54e-5 to get km. For example, 10 in = 0.000254 km.
1 in equals 2.54e-5 km.
Pipe sizes are labelled in inches (NPS) but calculated in mm; equipment layouts mix metres and feet.