Pipe Weight Calculator
Get pipe weight per unit length and total weight for a run of pipe. Pick a standard NPS and schedule for exact ASME B36.10 dimensions, or enter custom OD and wall thickness for any pipe, tube or material.
Pipe & Material Inputs
Formula
Weight per metre in lb/ft is obtained by converting kg/m × 0.6720. This is exact metal cross-section × density — it does not include weld reinforcement, coating, or lining weight.
Worked example
6″ NPS, Schedule 40 carbon steel pipe, 12 m long.
| Quantity | Value |
|---|---|
| OD | 168.3 mm |
| Wall thickness (Sch 40) | 7.11 mm |
| ID | 168.3 − 2×7.11 = 154.08 mm |
| Metal area A | (π/4)(168.3² − 154.08²) = 3,600.5 mm² |
| Weight per metre | 3,600.5 × 7850 × 10⁻⁶ = 28.26 kg/m |
| Total weight, 12 m | 28.26 × 12 = 339.2 kg |
Cross-check: ASME B36.10 tabulates 6″ Sch 40 at 18.97 lb/ft = 28.22 kg/m; the geometric calculation here (28.26 kg/m) is within the normal ~0.1–0.2% rounding difference between nominal tabulated weights and computed metal cross-section, and matches standard engineering references.
Common NPS outside diameters (ASME B36.10 / B36.19)
| NPS | OD, mm | NPS | OD, mm |
|---|---|---|---|
| ½″ | 21.3 | 6″ | 168.3 |
| ¾″ | 26.7 | 8″ | 219.1 |
| 1″ | 33.4 | 10″ | 273.1 |
| 1½″ | 48.3 | 12″ | 323.9 |
| 2″ | 60.3 | 16″ | 406.4 |
| 3″ | 88.9 | 20″ | 508.0 |
| 4″ | 114.3 | 24″ | 610.0 |
Frequently asked questions
Does this include the weight of fittings, flanges or coating?
No. This calculates bare pipe metal weight only, from OD, wall thickness and density. Add fitting, flange, insulation and coating weight separately for a full BOQ or lifting weight.
Why does my calculated weight differ slightly from the ASME B36.10 tabulated weight?
Tabulated weights in B36.10 use a slightly different nominal steel density (0.2836 lb/in³) and rounding conventions. The geometric calculation here is exact for the entered OD/WT/density and will typically be within 1–2% of the tabulated value.
What density should I use for stainless steel?
8000 kg/m³ is the standard reference density for austenitic stainless (304/304L/316/316L) used in ASME and most vendor weight tables.
Can I use this for tube (not pipe) sizes?
Yes — switch to custom OD & wall thickness and enter the actual tube dimensions; the same area × density formula applies to any tubular section.