Pipe Weight Calculator
Outside diameter, wall thickness, length and grade. The engine returns the weight of the length and the weight per metre, and refuses a wall that would leave no bore.
Pipe / tube
What this calculates
Pipe and circular tube of any grade in the density table, from outside diameter and wall thickness. Enter the actual outside diameter in millimetres — for a scheduled pipe that is the OD the schedule table gives for the nominal size, not the nominal size itself.
The per-metre readout is the figure pipe is bought on; the total is that figure over the length you entered. Both are theoretical: nominal OD and wall, no mill tolerance. Hot-finished pipe in particular is rolled to a wall tolerance that moves the actual weight.
The schedule chart that turns a nominal size and schedule into an OD and wall is a lookup table, not a formula, and it is being built as its own tool. Until then read the OD and wall from your specification and enter them here.
Show the formula and a worked example
The formula
- W = π ÷ 4 × (OD² − (OD − 2t)²) × L × ρ ÷ 10⁹
- kg/m = π ÷ 4 × (OD² − (OD − 2t)²) × ρ ÷ 10⁶
Dimensions in millimetres, density ρ in kg/m³ — as the engine runs them.
A pipe's cross-section is the outer circle minus the bore: π ÷ 4 × (OD² − ID²), where ID = OD − 2 × wall. Multiplying by length in millimetres and density in kg/m³ and dividing by 10⁹ gives kilograms; per metre, the length drops out and the divisor is 10⁶.
The engine checks that twice the wall is less than the outside diameter before it computes anything. A wall of 30 mm on a 60 mm OD is solid bar, not pipe, and the page says so instead of printing a figure.
Worked example
| Shape | Pipe / tube |
|---|---|
| Outside diameter | 60.3 mm |
| Wall thickness | 3.91 mm |
| Length | 6000 mm |
| Material grade | 316L |
| Density | 8,000 kg/m³ · grade density |
| Theoretical weight | 33.25 kg |
| Per metre | 5.54 kg/m |
Computed by the calculation engine from these inputs at render time, rounded only for display.
Frequently asked
- 01Do I enter the nominal size or the outside diameter?
- The outside diameter in millimetres. A 2-inch nominal pipe has an OD of 60.3 mm; the schedule fixes the wall. Read both from the schedule table in your specification and enter them here.
- 02Why is there no schedule dropdown?
- A schedule is a lookup, not a formula — each nominal size and schedule maps to one OD and wall in the standard's table. That table is being loaded as its own tool, the pipe schedule chart, so the figures come from the standard rather than being approximated here.
- 03Does the weight cover the end connections?
- No. Plain-end pipe only. Threads, bevels, couplings and flanges are not in the calculation; note them in the enquiry.
- 04Why does the calculator refuse my wall thickness?
- Because twice the wall is not smaller than the outside diameter, which would leave no bore. Check whether you entered the inside diameter or the radius by mistake.
- 05What happens when I click "Get this quoted"?
- The enquiry form opens with OD, wall, length, grade, density and both weights already written into the requirement. You can edit every line before you submit.