Pipe Weight Calculator

The standard formula is: pipe weight = π × [(outer diameter / 2)² − (inner diameter / 2)²] × length × material density. Enter any two of OD, ID or wall thickness — the calculator derives the third automatically — pick a material, and the rest is arithmetic. Example: a 10 ft, 2 inch nominal Sch 40 carbon steel pipe weighs about 3.66 lb/ft, so a full 10 ft stick comes to roughly 36.6 lb.

A 4 inch nominal Sch 40 PVC pipe has an OD of 4.500 inch, a wall thickness of 0.237 inch, and an ID of about 4.026 inch. At PVC's density of 1.45 g/cm³ the linear weight is roughly 2.0 lb/ft — so a standard 10 ft stick weighs about 20 lb and a 20 ft piece about 40 lb.

Steel pipe weight follows the same general hollow‑cylinder formula as every pipe; only the density changes. Carbon steel runs about 7.84 g/cm³, mild steel 7.88 g/cm³, and stainless steel about 8.03 g/cm³. In imperial terms, carbon steel converts to roughly 0.284 lb/in³. Our calculator swaps the density automatically when you pick a steel type.

Use millimeters for every dimension (OD, wall thickness, length) and the calculator returns kilograms directly. Internally it converts your mm geometry to cubic millimeters and multiplies by density in kg/mm³ (= g/cm³ × 10⁻⁶). The metric shortcut: measure in meters for OD and thickness, multiply the hollow‑section area by length and density in kg/m³ — you get the weight in kg in one pass.

NPS stands for Nominal Pipe Size — a standard label that lets steel and plastic pipe manufacturers agree on the outer diameter of the pipe (2 inch NPS always has a 2.375 inch OD, for example). Schedule is a strength rating that, combined with NPS, defines the wall thickness. Sch 40 is the most common general‑purpose schedule; Sch 80 is heavier and used for higher pressure, and Sch 160 is the thickest standard schedule for heavy‑wall applications.

Wall thickness for Sch 40 depends on the pipe size: 1/2 inch NPS Sch 40 is 0.109 inch thick, 2 inch NPS Sch 40 is 0.154 inch, 4 inch NPS Sch 40 is 0.237 inch, and 10 inch NPS Sch 40 is 0.365 inch. For most sizes Sch 40 approximates the older 'standard weight' specification. Pick an NPS and Schedule in our calculator and the thickness auto‑fills.

OD is outer diameter — the full width of the pipe including its walls. ID is inner diameter — the width of the hole the pipe carries fluid through. They are related by wall thickness: ID = OD − 2 × thickness. If you know any two of the three (OD, ID, thickness) you can always work out the third, which is exactly how this calculator stays flexible.

Weight per foot — linear density — is simply the total weight of a pipe divided by its length. For carbon steel the rule of thumb is 10.68 × t × (OD − t) lb/ft with dimensions in inches, but the exact figure depends on material density. Our calculator shows linear density in lb/ft (imperial) or kg/m (metric) so you can price or plan any stick length in one multiplication.

Pipe weight matters for structural support, crane and truck sizing, load ratings for racks and brackets, and even shipping costs — a full container of 40 ft steel pipe can easily exceed 25 tons. It also tells you how the pipe contributes to dead load in structural frames and whether a handrail or awning design has enough steel to resist its own mass.

Carbon steel sits at 7.85 g/cm³ (about 490 lb/ft³) and is the baseline for pipe weight estimation. Mild steel is slightly heavier around 7.88 g/cm³, stainless steel a touch heavier again at roughly 7.93–8.03 g/cm³ because of the chromium and nickel alloying additions. Pick the exact grade in our Material dropdown and the calculator applies the correct density automatically.

Yes — every material in the dropdown works with the same hollow‑cylinder formula. Copper is very dense at 8.96 g/cm³, aluminum surprisingly light at 2.70 g/cm³, and PVC much lighter again at 1.45 g/cm³, so an identical OD × wall × length pipe in each material produces dramatically different weights.

The math is exact for the dimensions and density you enter. Real‑world pipe can vary slightly from nominal — wall thickness tolerances are typically ±12.5% for steel pipe — and the weight difference between hot‑rolled and cold‑drawn steel or between schedule variations can be a few percent. For estimating and planning the result is more than accurate enough; for rated lifting or shipping manifests, confirm dimensions with the supplier.

Multiply the per-foot chart value by 40. A 2 inch Sch 40 joint runs 3.66 lb/ft — about 146 lb per stick; 4 inch Sch 40 is 10.79 lb/ft — about 432 lb; and 6 inch Sch 40 is 18.99 lb/ft — about 760 lb per 40 ft joint. That is why crews unload 6 inch and up with a forklift, not by hand. The full pipe weight chart below lists every NPS and schedule.

Water weighs 62.4 lb/ft³ (0.0361 lb/in³), so each foot of pipe holds 0.34 × ID² pounds of water (ID in inches). A 2 inch Sch 40 pipe with a 2.067 in ID carries about 1.45 lb/ft of water on top of the 3.66 lb/ft of steel — a roughly 40% increase. Hydrostatic test crews, pump sizing and structural checks on filled lines should always add water weight.

Barlow's formula — P = 2 × S × t / D — estimates the internal pressure a pipe can hold from its wall thickness t, outside diameter D and the material's allowable stress S (psi). Depending on the question, S is the SMYS for internal pressure at minimum yield, the SMTS for ultimate bursting pressure, or SMYS reduced by a design factor for maximum allowable operating pressure and mill hydrostatic test pressure. It pairs naturally with our calculator: pick an NPS and Schedule to get t and D, then plug them into Barlow with your grade's yield strength.

Invert the linear-density relation: length = total weight ÷ weight per foot. A pallet of 2 inch Sch 40 carbon steel (3.66 lb/ft) that reads 500 lb on the scale works out to 500 ÷ 3.66 ≈ 137 linear feet of pipe; the same division works in metric (kg ÷ kg/m = meters). If the run includes fittings, add their takeoff allowances to the straight lengths — each 90° butt-weld elbow consumes about 1.5 × NPS of pipe, each 45° elbow about 0.5 × NPS. The calculator's linear-density readout gives you the divisor for any size and material.

Gray cast iron runs about 7.20 g/cm³ and ductile iron about 7.15 g/cm³ — roughly 8–9% lighter than carbon steel's 7.85 because of their free graphite structure. Both materials are in the calculator's Material dropdown, so a 4 inch cast iron pipe comes out lighter than the same size in carbon steel. Keep in mind that waterworks ductile iron pipe (DI pipe) is usually specified by thickness class rather than schedule, so enter the actual wall thickness from the spec sheet for the most accurate result.

The calculator weighs the bare pipe wall you specify — external coatings and linings are extra. Concrete weight coating is the largest adder: at roughly 150 lb/ft³, a 1 inch coat on a 12 inch pipe adds about 42 lb per foot. Treat the coating as its own hollow cylinder (coat OD = pipe OD + 2 × coating thickness) and add it to the steel figure; cement-mortar lining and paint are computed the same way in smaller amounts. Zinc-coated pipe is the one exception — pick Galvanized Steel in the Material dropdown and the coating is already reflected in the density.