Calculate dry weight, fluid weight, and wet weight for a straight cylindrical pipe.
Per-metre values for support design baseline loads.
For design guidance only. Always verify with a qualified engineer.
About this pipe weight calculator
This free pipe weight calculator works out the dry weight, fluid weight and wet weight of a straight cylindrical pipe, along with per-metre figures and an optional wet load per support bracket. It is built for UK building-services engineers, mechanical contractors and pipework designers who need a quick baseline load for hanger and support design. You enter the geometry by outer diameter plus wall thickness, inner diameter (bore) plus wall thickness, or by picking a standard schedule that auto-fills the dimensions. Material and fluid presets are provided, with custom density and a fill condition from empty to full.
How the pipe weight is calculated
The calculation is purely geometric. The metal cross-section is treated as an annulus, so the material volume is Vmat = πL(ro² − ri²) and the bore volume is Vfluid = πLri² multiplied by the fill fraction. Each volume is multiplied by its density (in g/cm³) to give a mass: material density for the dry pipe and fluid density for the contents. Wet weight is simply dry plus fluid weight. Schedule dimensions are drawn from ASME B36.10M (Sch 10/40/80 and XS), BS EN 10255 (medium and heavy) and BS EN 1057 (copper R250). Results can be shown as mass in kg or as an approximate load in kN using g = 9.81 m/s².
Frequently asked questions
Does the calculator account for valves and fittings?
No. It assumes a straight cylindrical pipe only. You should add point loads for valves, strainers, flanges and other fittings separately when sizing supports.
Can I work out the load per support bracket?
Yes. Enter a support spacing in metres and the calculator multiplies the wet weight per metre by that spacing to give the wet load carried by each bracket. Leave it at zero to skip this check.
Which standards do the schedule sizes come from?
The auto-fill schedule data uses ASME B36.10M for steel pipe (Sch 10/40/80 and Extra Strong), BS EN 10255 for medium and heavy threadable tube, and BS EN 1057 for half-hard copper. Densities are nominal, so verify with the manufacturer for project work and always confirm with a qualified engineer.