Toolbox / Pipe weight
Pipe Weight & Section Properties Calculator
Pick the size and schedule, choose the material, and get weight per metre, section properties and the total tonnage for your order, ready to print or send with an enquiry.
NPS 4 (DN 100) Sch 40, Carbon steel (A106 / A53 / API 5L)
Dimensions and section properties
| Outside diameter (OD) | 114.3 | mm |
|---|---|---|
| Wall thickness (t) | 6.02 | mm |
| Inside diameter (ID) | 102.26 | mm |
| Metal area (Am) | 2,047.8 | mm² |
| Flow area (Ai) | 8,213.1 | mm² |
| Moment of inertia (I) | 301.04 | cm⁴ |
| Section modulus (Z) | 52.68 | cm³ |
| Radius of gyration (r) | 38.34 | mm |
Quantity and totals
| Pieces | 100 | x 6.00 m |
|---|---|---|
| Total length | 600.00 | m |
| Pipe weight | 9,645.0 | kg |
| Fluid weight | 4,927.8 | kg |
| Total weight | 14,572.8 | kg |
| Pipe weight, tonnes | 9.645 | t |
Report details
How this is calculated
- Weight per metre = metal area x density. Metal area = pi/4 (OD² − ID²) with ID = OD − 2t. One formula serves every material; only the density changes.
- Section properties of the hollow circle: I = pi/64 (OD⁴ − ID⁴), Z = I / (OD/2), r = √(I / Am).
- Fluid weight = flow area x specific gravity x 1000 kg/m³. Totals use the quantity you enter; tonnage is pipe metal only.
- Dimensions are nominal, from ASME B36.10M (carbon and alloy steel) and B36.19M (stainless). Weights are plain-end and ignore the mill tolerance; densities are nominal handbook values. Published catalogue weights use a 10.68 constant, so results differ by about 0.1 %.
Estimating tool. Verify dimensions and weights against ASME B36.10M / B36.19M and the manufacturer's data before ordering or design.
Frequently asked questions
How do you calculate pipe weight per metre?
Weight per metre = metal cross-section area × density. With outside diameter OD and wall thickness t in mm and carbon steel at 7.85 g/cm³, that is about 0.02466 × (OD − t) × t kg/m. The calculator uses the same formula with the density of the material you pick.
What does schedule 40 pipe weigh?
It depends on the size. In ASME B36.10M, NPS 2 Sch 40 (60.3 × 3.91 mm) weighs about 5.44 kg/m (3.65 lb/ft) and NPS 6 Sch 40 (168.3 × 7.11 mm) about 28.26 kg/m (18.97 lb/ft). Pick the size and schedule in the calculator for any other combination.
How do I get the weight of a pipe full of water?
Add the weight of the water in the bore: the inside cross-section area × 1,000 kg/m³ per metre of length. The calculator shows pipe, fluid and total weight per metre; set the specific gravity to 1 for water or 0 for an empty pipe.
What is the difference between STD, XS and schedule numbers?
STD (standard) and XS (extra strong) are older weight classes; Sch 10, 40, 80 and so on are schedule numbers. Up to NPS 10, STD has the same wall as Sch 40 and XS the same as Sch 80; above that they differ, so always state which one you mean on an order.
Why do stainless pipes weigh slightly more than carbon steel?
Stainless grades are denser. The calculator uses 7.85 g/cm³ for carbon steel, 7.93 g/cm³ for 304/304L and 7.98 g/cm³ for 316/316L, so the same size and schedule weighs about 1 to 2 % more in stainless.
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