Pipe Schedule Chart
OD, wall thickness, ID and kg/m for NPS 1/8" to 24" — Sch 5 to XXS (ASME B36.10M / B36.19M).
Pipe schedule chart — wall thickness (mm) and weight (kg/m)
| NPS | DN | OD mm | Sch 5 | Sch 10 | Sch 40 | Sch 80 | Sch 160 | Sch XXS |
|---|---|---|---|---|---|---|---|---|
| 1/8" | 6 | 10.29 | — | 1.240.28 kg/m | 1.730.37 kg/m | 2.410.47 kg/m | — | — |
| 1/4" | 8 | 13.72 | — | 1.650.49 kg/m | 2.240.63 kg/m | 3.020.80 kg/m | — | — |
| 3/8" | 10 | 17.15 | — | 1.650.63 kg/m | 2.310.85 kg/m | 3.201.10 kg/m | — | — |
| 1/2" | 15 | 21.34 | 1.650.80 kg/m | 2.111.00 kg/m | 2.771.27 kg/m | 3.731.62 kg/m | 4.781.95 kg/m | 7.472.56 kg/m |
| 3/4" | 20 | 26.67 | 1.651.02 kg/m | 2.111.28 kg/m | 2.871.68 kg/m | 3.912.19 kg/m | 5.562.89 kg/m | 7.823.64 kg/m |
| 1" | 25 | 33.40 | 1.651.29 kg/m | 2.772.09 kg/m | 3.382.50 kg/m | 4.553.24 kg/m | 6.354.24 kg/m | 9.095.45 kg/m |
| 1-1/4" | 32 | 42.16 | 1.651.65 kg/m | 2.772.69 kg/m | 3.563.39 kg/m | 4.854.46 kg/m | 6.355.61 kg/m | 9.707.76 kg/m |
| 1-1/2" | 40 | 48.26 | 1.651.90 kg/m | 2.773.11 kg/m | 3.684.05 kg/m | 5.085.41 kg/m | 7.147.24 kg/m | 10.169.55 kg/m |
| 2" | 50 | 60.33 | 1.652.39 kg/m | 2.773.93 kg/m | 3.915.44 kg/m | 5.547.49 kg/m | 8.7411.12 kg/m | 11.0713.45 kg/m |
| 2-1/2" | 65 | 73.02 | 2.113.69 kg/m | 3.055.26 kg/m | 5.168.64 kg/m | 7.0111.41 kg/m | 9.5214.91 kg/m | 14.0220.40 kg/m |
| 3" | 80 | 88.90 | 2.114.52 kg/m | 3.056.46 kg/m | 5.4911.29 kg/m | 7.6215.27 kg/m | 11.1321.35 kg/m | 15.2427.68 kg/m |
| 3-1/2" | 90 | 101.60 | 2.115.18 kg/m | 3.057.41 kg/m | 5.7413.57 kg/m | 8.0818.64 kg/m | — | 16.1534.03 kg/m |
| 4" | 100 | 114.30 | 2.115.84 kg/m | 3.058.37 kg/m | 6.0216.08 kg/m | 8.5622.32 kg/m | 13.4933.54 kg/m | 17.1241.03 kg/m |
| 5" | 125 | 141.30 | 2.779.46 kg/m | 3.4011.56 kg/m | 6.5521.77 kg/m | 9.5230.94 kg/m | 15.8849.12 kg/m | 19.0557.43 kg/m |
| 6" | 150 | 168.27 | 2.7711.31 kg/m | 3.4013.82 kg/m | 7.1128.26 kg/m | 10.9742.56 kg/m | 18.2667.55 kg/m | 21.9579.21 kg/m |
| 8" | 200 | 219.08 | 2.7714.78 kg/m | 3.7619.97 kg/m | 8.1842.55 kg/m | 12.7064.64 kg/m | 23.01111.26 kg/m | 22.23107.92 kg/m |
| 10" | 250 | 273.05 | 3.4022.61 kg/m | 4.1927.78 kg/m | 9.2760.30 kg/m | 15.0996.00 kg/m | 28.58172.31 kg/m | 25.40155.13 kg/m |
| 12" | 300 | 323.85 | 3.9631.24 kg/m | 4.5735.98 kg/m | 10.3179.72 kg/m | 17.48132.07 kg/m | 33.32238.73 kg/m | 25.40186.95 kg/m |
| 14" | 350 | 355.60 | 3.9634.34 kg/m | 6.3554.69 kg/m | 11.1394.55 kg/m | 19.05158.11 kg/m | 35.71281.72 kg/m | — |
| 16" | 400 | 406.40 | 4.1941.56 kg/m | 6.3562.65 kg/m | 12.70123.31 kg/m | 21.44203.54 kg/m | 40.49365.38 kg/m | — |
| 18" | 450 | 457.20 | 4.1946.81 kg/m | 6.3570.60 kg/m | 14.27155.88 kg/m | 23.83254.68 kg/m | 45.24459.62 kg/m | — |
| 20" | 500 | 508.00 | 4.7859.32 kg/m | 6.3578.56 kg/m | 15.09183.43 kg/m | 26.19311.19 kg/m | 50.01564.85 kg/m | — |
| 24" | 600 | 609.60 | 5.5482.53 kg/m | 6.3594.47 kg/m | 17.48255.25 kg/m | 30.96441.80 kg/m | 59.54807.68 kg/m | — |
Weights for carbon steel (7.85 g/cm³). Pick a size above for Sch 20, 30, 60, 100, 120, 140, STD and XS.
How it is calculated
Inside diameter = OD − 2 × WT. Weight uses carbon steel density 7.85 g/cm³: (OD − WT) × WT × 0.02466 kg/m.
Reference values for quick estimates. For orders and invoices, use the standard and the mill test certificate.
Pipe Schedule Chart — questions
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Get a quotationUp to NPS 10" they are the same wall thickness. From NPS 12" and above, STD stays at 9.53 mm (0.375") while Sch 40 gets thicker.
NPS 2" pipe has an outside diameter of 60.33 mm. Schedule 80 gives a wall thickness of 5.54 mm — heavier and stronger than Sch 40 (3.91 mm).
Yes. For a given NPS, the OD stays the same and the wall gets thicker as the schedule goes up, so the inside diameter becomes smaller.