Reference table
Pipe schedule chart
Outside diameter, wall thickness and inside diameter by nominal pipe size and schedule, per ASME B36.10, in inches and millimetres.
Wall thickness, inches (mm) · inside diameter in the second row of each cell
| NPS | OD in (mm) | Sch 10 | Sch STD | Sch 40 | Sch XS | Sch 80 | Sch 160 | Sch XXS |
|---|---|---|---|---|---|---|---|---|
| 1/2 | 0.840 (21.34) | 0.083 (2.11)ID 0.674 · 0.7 lb/ft | 0.109 (2.77)ID 0.622 · 0.9 lb/ft | 0.109 (2.77)ID 0.622 · 0.9 lb/ft | 0.147 (3.73)ID 0.546 · 1.1 lb/ft | 0.147 (3.73)ID 0.546 · 1.1 lb/ft | 0.188 (4.78)ID 0.464 · 1.3 lb/ft | 0.294 (7.47)ID 0.252 · 1.7 lb/ft |
| 3/4 | 1.050 (26.7) | 0.083 (2.11)ID 0.884 · 0.9 lb/ft | 0.113 (2.87)ID 0.824 · 1.1 lb/ft | 0.113 (2.87)ID 0.824 · 1.1 lb/ft | 0.154 (3.91)ID 0.742 · 1.5 lb/ft | 0.154 (3.91)ID 0.742 · 1.5 lb/ft | 0.219 (5.56)ID 0.612 · 1.9 lb/ft | 0.308 (7.82)ID 0.434 · 2.4 lb/ft |
| 1 | 1.315 (33.4) | 0.109 (2.77)ID 1.097 · 1.4 lb/ft | 0.133 (3.38)ID 1.049 · 1.7 lb/ft | 0.133 (3.38)ID 1.049 · 1.7 lb/ft | 0.179 (4.55)ID 0.957 · 2.2 lb/ft | 0.179 (4.55)ID 0.957 · 2.2 lb/ft | 0.250 (6.35)ID 0.815 · 2.8 lb/ft | 0.358 (9.09)ID 0.599 · 3.7 lb/ft |
| 1 1/4 | 1.660 (42.2) | 0.109 (2.77)ID 1.442 · 1.8 lb/ft | 0.140 (3.56)ID 1.380 · 2.3 lb/ft | 0.140 (3.56)ID 1.380 · 2.3 lb/ft | 0.191 (4.85)ID 1.278 · 3.0 lb/ft | 0.191 (4.85)ID 1.278 · 3.0 lb/ft | 0.250 (6.35)ID 1.160 · 3.8 lb/ft | 0.382 (9.70)ID 0.896 · 5.2 lb/ft |
| 1 1/2 | 1.900 (48.3) | 0.109 (2.77)ID 1.682 · 2.1 lb/ft | 0.145 (3.68)ID 1.610 · 2.7 lb/ft | 0.145 (3.68)ID 1.610 · 2.7 lb/ft | 0.200 (5.08)ID 1.500 · 3.6 lb/ft | 0.200 (5.08)ID 1.500 · 3.6 lb/ft | 0.281 (7.14)ID 1.338 · 4.9 lb/ft | 0.400 (10.16)ID 1.100 · 6.4 lb/ft |
| 2 | 2.375 (60.3) | 0.109 (2.77)ID 2.157 · 2.6 lb/ft | 0.154 (3.91)ID 2.067 · 3.7 lb/ft | 0.154 (3.91)ID 2.067 · 3.7 lb/ft | 0.218 (5.54)ID 1.939 · 5.0 lb/ft | 0.218 (5.54)ID 1.939 · 5.0 lb/ft | 0.344 (8.74)ID 1.687 · 7.5 lb/ft | 0.436 (11.07)ID 1.503 · 9.0 lb/ft |
| 2 1/2 | 2.875 (73.0) | 0.120 (3.05)ID 2.635 · 3.5 lb/ft | 0.203 (5.16)ID 2.469 · 5.8 lb/ft | 0.203 (5.16)ID 2.469 · 5.8 lb/ft | 0.276 (7.01)ID 2.323 · 7.7 lb/ft | 0.276 (7.01)ID 2.323 · 7.7 lb/ft | 0.375 (9.52)ID 2.125 · 10.0 lb/ft | 0.552 (14.02)ID 1.771 · 13.7 lb/ft |
| 3 | 3.500 (88.9) | 0.120 (3.05)ID 3.260 · 4.3 lb/ft | 0.216 (5.49)ID 3.068 · 7.6 lb/ft | 0.216 (5.49)ID 3.068 · 7.6 lb/ft | 0.300 (7.62)ID 2.900 · 10.3 lb/ft | 0.300 (7.62)ID 2.900 · 10.3 lb/ft | 0.438 (11.13)ID 2.624 · 14.3 lb/ft | 0.600 (15.24)ID 2.300 · 18.6 lb/ft |
| 4 | 4.500 (114.3) | 0.120 (3.05)ID 4.260 · 5.6 lb/ft | 0.237 (6.02)ID 4.026 · 10.8 lb/ft | 0.237 (6.02)ID 4.026 · 10.8 lb/ft | 0.337 (8.56)ID 3.826 · 15.0 lb/ft | 0.337 (8.56)ID 3.826 · 15.0 lb/ft | 0.531 (13.49)ID 3.438 · 22.5 lb/ft | 0.674 (17.12)ID 3.152 · 27.6 lb/ft |
| 6 | 6.625 (168.3) | 0.134 (3.40)ID 6.357 · 9.3 lb/ft | 0.280 (7.11)ID 6.065 · 19.0 lb/ft | 0.280 (7.11)ID 6.065 · 19.0 lb/ft | 0.432 (10.97)ID 5.761 · 28.6 lb/ft | 0.432 (10.97)ID 5.761 · 28.6 lb/ft | 0.719 (18.26)ID 5.187 · 45.4 lb/ft | 0.864 (21.95)ID 4.897 · 53.2 lb/ft |
| 8 | 8.625 (219.1) | 0.148 (3.76)ID 8.329 · 13.4 lb/ft | 0.322 (8.18)ID 7.981 · 28.6 lb/ft | 0.322 (8.18)ID 7.981 · 28.6 lb/ft | 0.500 (12.70)ID 7.625 · 43.4 lb/ft | 0.500 (12.70)ID 7.625 · 43.4 lb/ft | 0.906 (23.01)ID 6.813 · 74.8 lb/ft | 0.875 (22.22)ID 6.875 · 72.5 lb/ft |
| 10 | 10.750 (273.1) | 0.165 (4.19)ID 10.420 · 18.7 lb/ft | 0.365 (9.27)ID 10.020 · 40.5 lb/ft | 0.365 (9.27)ID 10.020 · 40.5 lb/ft | 0.500 (12.70)ID 9.750 · 54.8 lb/ft | 0.594 (15.09)ID 9.562 · 64.5 lb/ft | 1.125 (28.6)ID 8.500 · 115.8 lb/ft | 1.000 (25.4)ID 8.750 · 104.2 lb/ft |
| 12 | 12.750 (323.8) | 0.180 (4.57)ID 12.390 · 24.2 lb/ft | 0.375 (9.52)ID 12.000 · 49.6 lb/ft | 0.406 (10.31)ID 11.938 · 53.6 lb/ft | 0.500 (12.70)ID 11.750 · 65.5 lb/ft | 0.688 (17.48)ID 11.374 · 88.7 lb/ft | 1.312 (33.3)ID 10.126 · 160.4 lb/ft | 1.000 (25.4)ID 10.750 · 125.6 lb/ft |
| 14 | 14.000 (355.6) | 0.250 (6.35)ID 13.500 · 36.7 lb/ft | 0.375 (9.52)ID 13.250 · 54.6 lb/ft | 0.438 (11.13)ID 13.124 · 63.5 lb/ft | 0.500 (12.70)ID 13.000 · 72.2 lb/ft | 0.750 (19.05)ID 12.500 · 106.2 lb/ft | 1.406 (35.7)ID 11.188 · 189.3 lb/ft | · |
| 16 | 16.000 (406.4) | 0.250 (6.35)ID 15.500 · 42.1 lb/ft | 0.375 (9.52)ID 15.250 · 62.6 lb/ft | 0.500 (12.70)ID 15.000 · 82.8 lb/ft | 0.500 (12.70)ID 15.000 · 82.8 lb/ft | 0.844 (21.44)ID 14.312 · 136.7 lb/ft | 1.594 (40.5)ID 12.812 · 245.5 lb/ft | · |
| 18 | 18.000 (457.2) | 0.250 (6.35)ID 17.500 · 47.4 lb/ft | 0.375 (9.52)ID 17.250 · 70.7 lb/ft | 0.562 (14.27)ID 16.876 · 104.8 lb/ft | 0.500 (12.70)ID 17.000 · 93.5 lb/ft | 0.938 (23.83)ID 16.124 · 171.1 lb/ft | 1.781 (45.2)ID 14.438 · 308.8 lb/ft | · |
| 20 | 20.000 (508.0) | 0.250 (6.35)ID 19.500 · 52.8 lb/ft | 0.375 (9.52)ID 19.250 · 78.7 lb/ft | 0.594 (15.09)ID 18.812 · 123.2 lb/ft | 0.500 (12.70)ID 19.000 · 104.2 lb/ft | 1.031 (26.2)ID 17.938 · 209.1 lb/ft | 1.969 (50.0)ID 16.062 · 379.5 lb/ft | · |
| 24 | 24.000 (609.6) | 0.250 (6.35)ID 23.500 · 63.5 lb/ft | 0.375 (9.52)ID 23.250 · 94.7 lb/ft | 0.688 (17.48)ID 22.624 · 171.5 lb/ft | 0.500 (12.70)ID 23.000 · 125.6 lb/ft | 1.218 (30.9)ID 21.564 · 296.6 lb/ft | 2.344 (59.5)ID 19.312 · 542.6 lb/ft | · |
Carbon steel per ASME B36.10M. Weight is plain-end, 10.69 x (OD - t) x t lb/ft. A dot means the schedule is not defined at that size. Pipe made without a weld seam carries a 12.5 percent minus tolerance on wall unless ordered otherwise; use the minimum thickness calculator to pick a schedule against tMin.
Answers
Pipe schedule questions
What is the difference between schedule and STD or XS?
Schedule numbers (10, 40, 80, 160) are the modern wall-thickness series. STD and XS are the older standard and extra strong walls. For sizes up to 10 inch STD equals schedule 40 and XS equals schedule 80; above that they diverge and STD stays at 0.375 inch.
Why does the outside diameter not match the nominal size?
Nominal pipe size is a name, not a dimension. Up to 12 inch the outside diameter is larger than the name (a 6 inch pipe is 6.625 inch outside); from 14 inch upward the outside diameter equals the name and the schedule changes only the inside.
How do I pick a schedule from a required thickness?
Divide the required thickness by 0.875 to allow the 12.5 percent mill tolerance on pipe made without a weld seam, then choose the lightest schedule whose nominal wall meets that number. The minimum thickness calculator on this site does that for you.
Are these values the standard's?
They follow ASME B36.10M for carbon steel pipe. Stainless (B36.19) schedules 5S, 10S, 40S and 80S differ for some sizes, and purchase specifications can override wall thickness.