What is the pipe weight formula?

Weight equals ring cross-section area times length times material density. The ring area is (pi/4) x (OD^2 - ID^2), where OD is the outer diameter and ID is the inner diameter.

Should I enter outer diameter and wall thickness, or outer and inner diameter?

Either works. Use the toggle to enter outer diameter plus wall thickness (the inner diameter is derived as OD minus twice the wall thickness), or enter outer diameter and inner diameter directly if you already know both.

What is pipe schedule?

Schedule (Sch 40, Sch 80, etc.) is a standard designation for pipe wall thickness at a given nominal pipe size. A higher schedule number means a thicker wall and a smaller inner diameter for the same outer diameter.

What materials does this calculator support?

Steel (mild/carbon), stainless steel (304), aluminum (6061), copper, and PVC (Schedule 40), each using a standard engineering reference density.

Does it show weight per foot?

Yes. The result detail shows weight per foot alongside the total weight, and the Weight per Foot tab compares weight per foot across all five supported materials at your entered dimensions.

Does this calculator use pounds or kilograms?

Both. The main result displays in pounds with the kilogram equivalent shown alongside it, so you can read whichever unit your supplier or spec sheet uses.

Pipe Weight Calculator — OD, Wall & Material

NPS	OD (in)	Sch 40 wall (in)	Sch 80 wall (in)
1/2″	0.840	0.109	0.147
3/4″	1.050	0.113	0.154
1″	1.315	0.133	0.179
1-1/4″	1.660	0.140	0.191
1-1/2″	1.900	0.145	0.200
2″	2.375	0.154	0.218
3″	3.500	0.216	0.300
4″	4.500	0.237	0.337
6″	6.625	0.280	0.432
8″	8.625	0.322	0.500

Material	lb/in³	g/cm³
Steel (mild/carbon)	0.2836	7.85
Stainless Steel (304)	0.289	8.00
Aluminum (6061)	0.0975	2.70
Copper	0.323	8.94
PVC (Schedule 40)	0.0506	1.40

📋

Walk-through

How to Use This Calculator

5 steps

1

Enter the outer diameter

Enter the pipe or tube's outer diameter (OD) in inches or millimeters, using the unit toggle. This is the measurement you'd get wrapping a tape measure around the outside of the pipe and dividing by pi, or reading off a spec sheet.

2

Enter wall thickness or inner diameter

Toggle between Wall Thickness and Inner Diameter, whichever you know, and enter it. If you enter wall thickness, the calculator derives the inner diameter as OD minus twice the wall thickness.

3

Pick a material

Choose the pipe material from the Material dropdown. The calculator looks up a standard reference density for steel, stainless steel, aluminum, copper, or PVC.

4

Enter the length

Enter the pipe's length in inches, feet, millimeters, or meters.

5

Read the result

The result updates instantly, showing total weight in pounds and kilograms, plus weight per foot, the inner diameter used, and the ring cross-section area so you can double-check the math.

⚡

Reference

Formula & Methodology

3 formulas

Weight from ring area, length, and density

Weight = (π ÷ 4) × (OD² − ID²) × Length × Density

A pipe or tube's cross-section is a ring: the outer circle's area minus the inner circle's area. Multiply that ring area by the pipe's length to get volume, then by the material's density to get weight.

Inner diameter from wall thickness

ID = OD − 2 × Wall Thickness

When you know the wall thickness instead of the inner diameter, subtract twice the wall thickness (one wall on each side) from the outer diameter to get the inner diameter.

Weight per foot

Weight per foot = Ring Area × 12 in × Density

Weight per foot depends only on the pipe's cross-section and material — not on the total length — so it's a fixed rate you can multiply by any run length.

📖

Glossary

Key Terms Explained

7 terms

Outer diameter (OD) The diameter measured across the outside of the pipe wall, the figure usually used to name a pipe size (e.g., a "2-inch pipe" typically refers to a nominal size close to, but not always exactly, 2 inches OD).

Wall thickness The thickness of the pipe material between the outer and inner surfaces. A thicker wall means a smaller inner diameter and more material — and more weight — for the same outer diameter.

Ring area The pipe's cross-sectional area: the outer circle's area minus the inner circle's area, (π/4) × (OD² − ID²). This is the area you'd see if you cut the pipe straight across.

Schedule A standard designation (Schedule 40, Schedule 80, etc.) for pipe wall thickness at a given nominal pipe size. Higher schedule numbers mean thicker walls and smaller inner diameters for the same outer diameter.

Density Mass per unit volume, expressed here as pounds per cubic inch (lb/in³) or grams per cubic centimeter (g/cm³). Denser materials — like copper — weigh more than lighter materials like PVC for the same pipe dimensions.

Nominal pipe size (NPS) A dimensionless standard designation for pipe size (e.g., NPS 2) that doesn't always equal the actual outer diameter in inches — for smaller sizes, the actual OD is often larger than the NPS number.

Weight per foot The pipe's weight for a one-foot length, useful for estimating shipping weight or material cost on a run of any length without recalculating from scratch.

👥

Scenarios

Real-World Examples

3 worked examples

🚧

Railing contractor

2 in OD steel tube, 0.065 in wall, 6 feet

Outer diameter 2 in Wall thickness 0.065 in Material Steel (mild/carbon) Length 6 ft

A 2 in OD tube with a 0.065 in wall has an inner diameter of 1.87 in. The ring area is (π/4) × (2² − 1.87²) ≈ 0.395 in². Over 6 feet (72 in), that's about 28.4 in³ of steel — roughly 8.1 lb (3.7 kg), or about 1.35 lb per foot.

🔧

Plumber sizing copper runs

3/4 in copper tube, Type L wall, 25 feet

Outer diameter 0.875 in Wall thickness 0.045 in Material Copper Length 25 ft

0.875 in OD copper tube with a 0.045 in wall has an inner diameter of 0.785 in. The ring area is about 0.117 in², giving roughly 1.4 in² × 12 in worth of copper per foot — about 0.45 lb/ft, or about 11.3 lb for the full 25-foot run at copper's higher 0.323 lb/in³ density.

🏗️

Contractor comparing PVC to steel

4 in Schedule 40 pipe, 20 feet, PVC vs. steel

Outer diameter 4.5 in Wall thickness 0.237 in (Sch 40) Length 20 ft

At the same 4.5 in OD and 0.237 in Schedule 40 wall, the ring area is about 3.17 in². Steel at 0.2836 lb/in³ weighs roughly 10.8 lb/ft (about 216 lb for 20 feet), while PVC at 0.0506 lb/in³ weighs only about 1.9 lb/ft (about 39 lb for 20 feet) — over 5 times lighter for the same size, which is why PVC is easier to handle on long drain and conduit runs.

📄

Deep Dive

Understanding the Pipe Weight Calculator

3 chapters · 4 min read

Knowing how much a pipe or tube weighs — before you order it, ship it, or hang it — matters for shipping quotes, structural support spacing, and material cost estimates. This calculator reduces any pipe to a ring cross-section area times a length, then multiplies by the material's density to get weight.

How the calculation works

A pipe or tube's cross-section is a ring: the outer circle's area minus the inner circle's area, (π/4) × (OD² − ID²). You can supply the inner diameter directly, or let the calculator derive it from the outer diameter and wall thickness (ID = OD − 2 × wall thickness) — both give the same ring area. Multiply that area by the pipe's length to get volume, and multiply volume by the material's density to get weight. Density figures come from standard engineering reference tables (MatWeb / eFunda) for each material's most common grade.

Wall thickness, schedule, and nominal size

Pipe wall thickness is often specified by schedule (Schedule 40, Schedule 80, and so on) rather than a raw thickness number. Schedule sets the wall thickness for a given nominal pipe size (NPS) — a higher schedule number means a thicker wall and a smaller inner diameter at the same outer diameter, and therefore more weight per foot. The Schedule Reference tab lists standard ASME B36.10 outer-diameter and wall-thickness values for common NPS sizes, which you can plug straight into the Weight tab.

Choosing the right material and comparing options

The Weight per Foot tab shows how the same pipe geometry weighs in each of the five supported materials — steel, stainless steel, aluminum, copper, and PVC — side by side. This is useful when you're deciding between materials for the same job: PVC is roughly a fifth the weight of steel at the same dimensions, which matters for handling and support spacing, while copper's higher density and cost usually reflects its use in smaller-diameter plumbing runs rather than large structural pipe.

❓

Questions

Frequently Asked Questions

6 questions

What does the Pipe Weight Calculator actually compute?+

It computes the total weight of a metal or PVC pipe or tube from its outer diameter, an inner boundary (wall thickness or inner diameter), length, and material — using ring area × length × density — and also shows the weight per foot.

How accurate is this calculator?+

It uses nominal dimensions and standard reference densities, which is accurate enough for estimating, quoting, and shipping-weight planning. For certified weights, use the mill certificate or a scale — actual stock can vary slightly from nominal size, and different alloys within a material family have slightly different densities.

What units does the Pipe Weight Calculator expect?+

Outer diameter, wall thickness, and inner diameter accept inches or millimeters (toggle between them). Length accepts inches, feet, millimeters, or meters. Results display in pounds and kilograms, with weight per foot shown in pounds and weight per meter shown in kilograms on the comparison table.

Can I share my results?+

Yes. The calculator encodes your inputs into the URL, so copying the page URL after entering your dimensions is enough to share the exact scenario with a colleague.

Where do the density and schedule figures come from?+

Material densities come from standard engineering reference tables (MatWeb / eFunda). The Schedule Reference tab's outer-diameter and wall-thickness values follow the ASME B36.10 standard for welded and seamless wrought steel pipe, commonly used across pipe schedules regardless of material.

Why does entering wall thickness give the same answer as entering inner diameter directly?+

Because inner diameter equals outer diameter minus twice the wall thickness — the calculator just derives one from the other before computing the same ring area. Use whichever value you already have on hand.

Download a one-page PDF of your numbers instantly. Add your email to also get our occasional calculator tips — no spam, unsubscribe anytime. Privacy.

Pipe Weight Calculator