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NPS to DN Pipe Size Chart
NPS to DN chart for steel pipe, with the actual outside diameter in mm and inches for each size.
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NPS, DN and outside diameter
| NPS (inch) | DN | OD mm | OD inch |
|---|---|---|---|
| 1/8 | 6 | 10.3 | 0.406 |
| 1/4 | 8 | 13.7 | 0.539 |
| 3/8 | 10 | 17.1 | 0.673 |
| 1/2 | 15 | 21.3 | 0.839 |
| 3/4 | 20 | 26.7 | 1.051 |
| 1 | 25 | 33.4 | 1.315 |
| 1 1/4 | 32 | 42.2 | 1.661 |
| 1 1/2 | 40 | 48.3 | 1.902 |
| 2 | 50 | 60.3 | 2.374 |
| 2 1/2 | 65 | 73.0 | 2.874 |
| 3 | 80 | 88.9 | 3.500 |
| 3 1/2 | 90 | 101.6 | 4.000 |
| 4 | 100 | 114.3 | 4.500 |
| 5 | 125 | 141.3 | 5.563 |
| 6 | 150 | 168.3 | 6.626 |
| 8 | 200 | 219.1 | 8.626 |
| 10 | 250 | 273.0 | 10.748 |
| 12 | 300 | 323.8 | 12.748 |
| 14 | 350 | 355.6 | 14.000 |
| 16 | 400 | 406.4 | 16.000 |
| 18 | 450 | 457.0 | 17.992 |
| 20 | 500 | 508.0 | 20.000 |
| 22 | 550 | 559.0 | 22.008 |
| 24 | 600 | 610.0 | 24.016 |
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About this Table
NPS to DN chart for steel pipe, with the actual outside diameter in mm and inches for each size.
Basis: ISO 6708 DN designations and ASME B36.10M / B36.19M outside diameters.
How to use
- Find NPS in inches and read the DN.
- Use the OD for clamp on meters, flange and fitting selection.
- DN is a label; it is not the bore.
Notes
- From NPS 14 the OD in inches equals the NPS.
- EN 10255 and some metric tube systems use different ODs for the same DN.
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Frequently Asked Questions
What DN is 2 inch pipe?
DN 50, with an OD of 60.3 mm.
What is DN 100 in inches?
NPS 4, OD 114.3 mm.
Is DN the inside diameter?
No. It is a nominal size; the bore depends on wall thickness.
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