Metric to Imperial Pipe/Tube Conversion Table
Imperial Tubing Metric Outside Diameter
*O.D: Outside Diameter
| Tube O.D Diameter | |
| in | mm |
| 1/8 | 3.17 |
| 3/16 | 4.76 |
| 1/4 | 6.35 |
| 5/16 | 7.93 |
| 3/8 | 9.52 |
| 1/2 | 12.7 |
| 5/8 | 15.87 |
| 3/4 | 19.05 |
| 7/8 | 22.22 |
| 1 | 25.4 |
Metric Imperial Piping Equivalent
| Pipe Nominal Size | |
| Inches | mm |
| 1/8 | 3 |
| 1/4 | 6 |
| 3/8 | 10 |
| 1/2 | 12 |
| 3/4 | 20 |
| 1 | 25 |
| 1 1/4 | 32 |
| 1 1/2 | 40 |
| 2 | 50 |
| 2 1/2 | 65 |
| 3 | 80 |
| 3 1/2 | 90 |
| 4 | 100 |
| 5 | 125 |
| 6 | 150 |
| 8 | 200 |
| 10 | 250 |
| 12 | 300 |
| 14 | 350 |