Steel Pipe Size & Schedule Database
Pipe sizing starts with NPS and schedule. Outside diameter is fixed for a given NPS while wall thickness changes with schedule.
Common Schedule 40 & 80 Steel Pipe Dimensions
This quick-reference table covers commonly requested nominal sizes. Final procurement dimensions and applicability must be confirmed against the governing standard and published manufacturer documentation.
| NPS | OD (in) | Sch 40 wall (in) | Sch 40 est. lb/ft | Sch 80 wall (in) | Sch 80 est. lb/ft |
|---|---|---|---|---|---|
| 1/2 | 0.840 | 0.109 | 0.85 | 0.147 | 1.09 |
| 3/4 | 1.050 | 0.113 | 1.13 | 0.154 | 1.48 |
| 1 | 1.315 | 0.133 | 1.68 | 0.179 | 2.17 |
| 1-1/4 | 1.660 | 0.140 | 2.28 | 0.191 | 3.00 |
| 1-1/2 | 1.900 | 0.145 | 2.72 | 0.200 | 3.64 |
| 2 | 2.375 | 0.154 | 3.66 | 0.218 | 5.03 |
| 2-1/2 | 2.875 | 0.203 | 5.80 | 0.276 | 7.67 |
| 3 | 3.500 | 0.216 | 7.58 | 0.300 | 10.26 |
| 4 | 4.500 | 0.237 | 10.80 | 0.337 | 15.00 |
| 5 | 5.563 | 0.258 | 14.63 | 0.375 | 20.80 |
| 6 | 6.625 | 0.280 | 18.99 | 0.432 | 28.60 |
| 8 | 8.625 | 0.322 | 28.58 | 0.500 | 43.43 |
| 10 | 10.750 | 0.365 | 40.53 | 0.594 | 64.50 |
| 12 | 12.750 | 0.406 | 53.58 | 0.688 | 88.72 |
Cross-check against the current governing ASME/ASTM specification and manufacturer data before procurement.