What is the formula for pipe weight per foot?

The industry-standard imperial formula is: Wt/Ft = 10.69 × (OD - Wall Thickness) × Wall Thickness, where OD and wall thickness are in inches and the result is in pounds per foot. This formula is derived from the annular cross-section area of the pipe multiplied by steel's density of approximately 0.2836 lb/in³. Source: NASPD Pipe Weight Calculator reference, citing ASME B36.10M.

What is the difference between Schedule 40 and Schedule 80 pipe?

Schedule refers to wall thickness. For a 2-inch NPS pipe, Schedule 40 has a 0.154-inch wall and weighs 3.65 lb/ft, while Schedule 80 has a 0.218-inch wall and weighs 5.02 lb/ft — about 37% heavier. The outside diameter is identical for both schedules on the same NPS size. Schedule 40 is standard weight; Schedule 80 is extra heavy. Per ASME B36.10M, Standard (STD) and Schedule 40 are identical through NPS 10.

How much does a 20-foot length of 4-inch Schedule 40 steel pipe weigh?

A 4-inch NPS Schedule 40 carbon steel pipe has an OD of 4.500 inches and a wall thickness of 0.237 inches. Using Wt/Ft = 10.69 × (4.500 - 0.237) × 0.237 = 10.80 lb/ft. A 20-foot length weighs 10.80 × 20 = 216.0 lb. Source: ASME B36.10M dimensional data.

How do I convert pipe weight from pounds per foot to kilograms per meter?

Multiply lb/ft by 1.48816 to get kg/m. For example, 10.80 lb/ft × 1.48816 = 16.07 kg/m. The conversion factor comes from combining 1 lb = 0.453592 kg and 1 ft = 0.3048 m: 0.453592 ÷ 0.3048 = 1.48816.

Does pipe material affect wall thickness when the schedule is the same?

No. Wall thickness is defined by the pipe schedule and NPS regardless of material. A 2-inch Schedule 40 steel pipe and a 2-inch Schedule 40 aluminum pipe both have a 0.154-inch wall. However, weight differs because aluminum's density (0.0975 lb/in³) is roughly one-third that of carbon steel (0.2836 lb/in³), so the aluminum pipe weighs about 34% as much per foot.

What is NPS and how does it relate to actual pipe outside diameter?

NPS (Nominal Pipe Size) is a dimensionless designator. For NPS 1/8 through NPS 12, the outside diameter is larger than the NPS number and does not equal it — for example, NPS 2 has an OD of 2.375 inches. At NPS 14 and above, the OD in inches equals the NPS number. Per ASME B36.10M, OD is fixed for each NPS regardless of schedule.

Pipe Weight Calculator - Weight Per Foot, Per Meter & Total Order Weight

Calculate the weight of any pipe by material, outside diameter, wall thickness, and length. Supports carbon steel, stainless steel, aluminum, copper, brass, PVC, and more. Uses the ASME B36.10M formula (Wt/Ft = 10.69 × (OD − t) × t for steel) with verified material densities for all other materials.

✓ Free, No Signup Required ✓ ASME B36.10M Formula ✓ Sources Cited ✓ No Data Stored or Transmitted ✓ Last Reviewed: June 2026

Pipe Dimensions & Material

NPS Schedule Lookup

Pipe Material *

Dimension Input Method

Outside Diameter (OD) * inches

Wall Thickness * inches

Pipe Length * feet

Number of Pipes *

Cost & Freight Estimation (optional)

Calculations follow ASME B36.10M and verified material density tables. Free — no account needed.

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How the Pipe Weight Formula Works

The standard pipe weight formula used by the piping industry and codified in ASME B36.10M is:

Wt/Ft = 10.69 × (OD − t) × t For carbon steel pipe — OD and t in inches, result in lb/ft

The coefficient 10.69 comes from combining carbon steel's density (0.2836 lb/in³) with unit conversion and π into a single constant. For non-steel materials, this calculator uses the full volumetric formula:

W = π/4 × (OD² − ID²) × L × ρ Universal formula — OD, ID in inches; L in inches; ρ in lb/in³

where ρ is the verified density for each material. This approach matches manufacturer weight tables within ±0.5%.

ASME B36.10M Schedule Reference — Common Pipe Sizes

Outside diameter, wall thickness, and carbon steel weight per foot for the most-used NPS sizes and schedules. Data per ASME B36.10M-2018 and ASME B36.19M (stainless).

NPS	OD (in)	Sch 40 Wall (in)	Sch 40 Wt/Ft (lb)	Sch 80 Wall (in)	Sch 80 Wt/Ft (lb)	Sch 160 Wall (in)	Sch 160 Wt/Ft (lb)
1/2"	0.840	0.109	0.85	0.147	1.09	0.188	1.31
3/4"	1.050	0.113	1.13	0.154	1.47	0.219	1.94
1"	1.315	0.133	1.68	0.179	2.17	0.250	2.84
1-1/2"	1.900	0.145	2.72	0.200	3.63	0.281	4.86
2"	2.375	0.154	3.65	0.218	5.02	0.344	7.46
3"	3.500	0.216	7.58	0.300	10.25	0.438	14.31
4"	4.500	0.237	10.79	0.337	14.98	0.531	22.51
6"	6.625	0.280	18.97	0.432	28.57	0.719	45.35
8"	8.625	0.322	28.55	0.500	43.39	0.906	74.69
10"	10.750	0.365	40.48	0.500	54.74	1.125	115.65
12"	12.750	0.375	49.56	0.500	65.42	1.312	160.28

Source: ASME B36.10M-2018, Table 1 — Welded and Seamless Wrought Steel Pipe. Carbon steel weight uses density 0.2833 lb/in³ per ASME standard.

Pipe Material Densities Used in This Calculator

Weight varies significantly by material. The table below shows the verified density values used in each calculation, along with the relevant ASTM or industry standard.

Material	Density (lb/in³)	Density (g/cm³)	vs. Carbon Steel	Standard / Source
Carbon Steel (A53/A106)	0.2836	7.85	— baseline	ASME B36.10M; ASTM A53
Stainless Steel 304	0.2890	8.00	+1.9%	ASTM A312 TP304
Stainless Steel 316	0.2890	8.00	+1.9%	ASTM A312 TP316
Cast Iron (Gray)	0.2600	7.20	-8.3%	ASTM A74; Eng. ToolBox
Aluminum 6061/6063	0.0975	2.70	-65.6%	ASTM B241; Eng. ToolBox
Copper (K/L/M)	0.3230	8.94	+13.9%	ASTM B88; Eng. ToolBox
Brass (Yellow 70/30)	0.3070	8.50	+8.3%	ASTM B135; Eng. ToolBox
PVC (Schedule 40/80)	0.0530	1.47	-81.3%	ASTM D1785; Eng. ToolBox
CPVC	0.0540	1.50	-81.0%	ASTM D2846; Eng. ToolBox
HDPE	0.0346	0.958	-87.8%	ASTM D3035; Eng. ToolBox

Sample Pipe Weight Calculations

Example 1 — 4" Sch 40 Carbon Steel, 20-Foot Spool

A mechanical contractor is ordering steel pipe for a hydronic heating system. The spec calls for 4-inch Schedule 40 carbon steel (ASTM A53 Grade B), 20-foot random lengths, 15 pieces.

1OD = 4.500 in, Wall = 0.237 in (from ASME B36.10M Table 1)

2Wt/Ft = 10.69 × (4.500 − 0.237) × 0.237 = 10.69 × 4.263 × 0.237 = 10.79 lb/ft

3Piece weight = 10.79 × 20 = 215.8 lb

4Order weight = 215.8 × 15 = 3,237 lb (1.62 short tons)

At $1.20/lb material cost, this order runs approximately $3,884. A flatbed or heavy-duty trailer is needed for transport.

Example 2 — 2" Type L Copper Pipe, Plumbing Rough-In

A plumber is rough-in a commercial kitchen. Type L copper, 2-inch nominal (OD 2.125 in, wall 0.060 in per ASTM B88), 50 pieces at 10 feet each.

1OD = 2.125 in, ID = 2.125 − (2 × 0.060) = 2.005 in

2Area = π/4 × (2.125² − 2.005²) = π/4 × (4.516 − 4.020) = 0.389 in²

3Wt/Ft = 0.389 × 12 × 0.3230 = 1.508 lb/ft

4Order = 1.508 × 10 × 50 = 754 lb

Example 3 — 6" Schedule 80 Stainless 316, Chemical Plant

A process engineer is specifying SS 316 pipe for a corrosive fluid line. Six-inch NPS, Schedule 80, 100-foot run (5 pieces at 20 ft each).

1OD = 6.625 in, Wall = 0.432 in (ASME B36.19M Sch 80S for stainless)

2ID = 6.625 − (2 × 0.432) = 5.761 in

3Wt/Ft = 10.69 × (6.625 − 0.432) × 0.432 × (0.2890 ÷ 0.2836) = 29.12 lb/ft

4Total = 29.12 × 100 ft = 2,912 lb (1.456 short tons)

At SS316 pricing around $4.50/lb (2026 market), this run costs approximately $13,104 in material alone. Use our steel weight calculator to cross-check structural steel sections on the same project.

Common Pipe Weight Calculation Errors

⚠ Confusing NPS with actual OD. A 2-inch NPS pipe has an OD of 2.375 inches, not 2.000 inches. Entering the NPS number as the OD results in a weight error of roughly 37% for common sizes. Always look up OD from an ASME B36.10M table or use the NPS lookup feature in this calculator.

⚠ Using the steel formula for non-steel materials. The 10.69 coefficient applies only to carbon steel (density 0.2836 lb/in³). Using it for aluminum, PVC, or copper gives results that are 65-83% too heavy for plastic pipe and wrong for all non-steel metals. This calculator auto-selects the correct formula per material.

⚠ Omitting the waste and joint allowance. Field pipe installations typically add 5-10% to the calculated linear footage for fittings, cut waste, and miscuts. A 500-lb order calculated exactly often requires ordering 525-550 lb. For project budget planning, include a 10% overage on pipe weight.

⚠ Ignoring fluid and insulation weight for structural support design. A 4-inch Schedule 40 steel pipe carrying water weighs 10.79 lb/ft empty but 15.77 lb/ft when full. When using pipe weight for hanger spacing or beam load calculations, always add the weight of fluid contents plus insulation.

⚠ Mixing nominal wall and minimum wall thickness. ASME B36.10M wall thicknesses are nominal values. ASTM A53 and A106 allow a mill undertolerance of 12.5% on wall thickness, which can reduce actual wall by up to 12.5% and weight accordingly. For pressure design, use minimum wall thickness in calculations per ASME B31.1 or B31.3.

Pipe Weight in Structural and Logistics Planning

Pipe weight drives four separate engineering and procurement decisions on construction projects.

⚒

Hanger and Support Spacing

MSS SP-69 and ASME B31.1 Table 121.5 prescribe maximum hanger spacing based on pipe weight and size. A 4-inch Schedule 40 steel pipe filled with water (15.8 lb/ft) requires supports every 17 feet per MSS SP-69 for standard-weight steel spans.

📦

Freight and Logistics

Standard mill lengths are 21 feet (random length) and 40 feet (double random). A truckload capacity of 40,000 lb accommodates roughly 3,700 feet of 4-inch Sch 40 pipe. Knowing total order weight determines whether LTL, flatbed, or crane-assisted delivery is needed.

🔧

Structural Dead Load

For slab and beam load calculations, mechanical pipe runs contribute to dead load. Exposed overhead pipe is often estimated at 2-5 lb/ft² of plan area for preliminary structural checks per IBC 2024 §1606.1.

💲

Procurement and Takeoff

Pipe is typically quoted by the foot but shipped and priced by the pound at the mill level. Converting your linear footage takeoff to total weight helps cross-check mill quotes, identify anomalies in pricing, and set a budget using the metal weight calculator for related structural sections.

Frequently Asked Questions

What is the pipe weight formula used in this calculator? +

For carbon steel pipe, the calculator uses the ASME B36.10M industry formula: Wt/Ft = 10.69 × (OD − t) × t, where OD is outside diameter in inches and t is wall thickness in inches. This gives weight in pounds per linear foot. For aluminum, copper, stainless steel, PVC, and other materials, the full volumetric formula W = π/4 × (OD² − ID²) × L × ρ is used with each material's verified density, giving accuracy within ±0.5% of manufacturer weight tables.

How do I find the wall thickness for a specific pipe schedule? +

Use the NPS Schedule Lookup feature at the top of the calculator form. Select the nominal pipe size and schedule number, then click "Auto-Fill Dimensions" to populate the OD and wall thickness fields automatically from the ASME B36.10M dimensional table. Alternatively, the reference table in this page lists common NPS sizes from 1/2" through 12" for Schedule 40, 80, and 160.

Does pipe schedule change if I use stainless steel instead of carbon steel? +

The outside diameter and wall thickness dimensions are the same for equivalent schedule numbers, but stainless pipe schedules are designated with an "S" suffix (e.g., Sch 10S, 40S, 80S) per ASME B36.19M rather than plain numbers per B36.10M. For most NPS sizes through 12", the dimensional values are nearly identical. However, Sch 40 carbon steel and Sch 40S stainless are not always the same wall thickness at larger sizes. Weight differs because stainless (0.2890 lb/in³) is about 1.9% denser than carbon steel (0.2836 lb/in³).

How much does a 20-foot stick of 2-inch Sch 40 steel pipe weigh? +

A 2-inch NPS Schedule 40 carbon steel pipe (OD = 2.375 in, wall = 0.154 in) weighs 3.65 lb/ft. A 20-foot piece weighs 73.0 lb. This is within a comfortable two-person manual carry range. A full 40-foot mill length of the same pipe weighs 146 lb, which typically requires a mechanical assist for safe handling. For comparison, 2-inch Sch 80 (0.218-in wall) weighs 5.02 lb/ft or 100.4 lb for 20 feet.

How do I calculate the weight of PVC or CPVC pipe? +

Select PVC or CPVC from the material dropdown and enter the OD and wall thickness. The calculator uses a density of 0.0530 lb/in³ for PVC (per ASTM D1785) and 0.0540 lb/in³ for CPVC (per ASTM D2846). PVC pipe is roughly 81% lighter than steel pipe of the same dimensions. For example, 4-inch Schedule 40 PVC (OD 4.500 in, wall 0.237 in) weighs only about 2.28 lb/ft versus 10.79 lb/ft for carbon steel. The aluminum weight calculator on this site uses the same verified density approach for aluminum tube and pipe.

What is the weight of water-filled pipe vs. empty pipe? +

This calculator outputs the weight of the pipe wall only (empty). To find water-filled weight, add the weight of water in the bore: Water weight (lb/ft) = π/4 × ID² × 12 × 0.0361 (density of water in lb/in³). For a 4-inch Sch 40 steel pipe (ID = 4.026 in): water weight = π/4 × 4.026² × 12 × 0.0361 = 5.51 lb/ft. Total weight when full = 10.79 + 5.51 = 16.30 lb/ft. This full-pipe weight matters for hanger design and beam deflection calculations.

How is pipe weight used in structural dead load calculations per IBC 2024? +

IBC 2024 §1606.1 defines dead load as the weight of all permanent construction, including plumbing and mechanical systems. Pipe weight is a permanent dead load component. For preliminary structural checks, mechanical engineers typically allocate 2-5 lb/ft² for piping, conduit, and duct when the exact layout is not known. For a completed pipe layout, the total weight (pipe + fluid + insulation) in kips is input directly into the beam load calculator or slab load calculator as a dead load component.

Sources & Methodology

ASME B36.10M-2018 — Welded and Seamless Wrought Steel Pipe. Dimensional data (OD, wall thickness) and weight-per-foot for all NPS sizes and schedules. asme.org
ASME B36.19M-2018 — Stainless Steel Pipe. Schedule designations (S suffix) and dimensional data for austenitic stainless pipe. asme.org
NASPD Pipe Weight Formula Reference — Imperial formula Wt/Ft = 10.69 × (OD − t) × t, confirmed by NASPD member reference materials. naspd.com
Engineering ToolBox — Metal Alloy Densities — Density values (lb/in³) for steel, stainless steel, aluminum, copper, brass, and cast iron. engineeringtoolbox.com
ASTM D1785-2023 — Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe. Density reference for PVC pipe weight calculations.
ASTM A53/A53M-2022 — Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. Grade B carbon steel physical properties.
MSS SP-69-2018 — Pipe Hangers and Supports — Selection and Application Guide. Hanger spacing recommendations referenced in the application context section.

Disclaimer: This calculator provides estimates for planning and procurement purposes. For permitted structural work, pressure system design, process piping, multi-story building mechanical systems, and any application governed by ASME B31.1, B31.3, or local code, calculations must be verified by a licensed mechanical or structural engineer per IBC 2024 §1604. ConcreteCalculate.com is not liable for structural or pressure-system decisions made from these estimates.

Privacy: All calculations run locally in your browser. No dimensions, project data, or personal information are transmitted to or stored on our servers. Reviewed by site author — Muhammad Ramzan Babar, physics researcher (PhD candidate).

Pipe Weight Calculator - Weight Per Foot, Per Meter & Total Order Weight

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📚 Helpful Guides

How the Pipe Weight Formula Works

ASME B36.10M Schedule Reference — Common Pipe Sizes

Pipe Material Densities Used in This Calculator

Sample Pipe Weight Calculations

Example 1 — 4" Sch 40 Carbon Steel, 20-Foot Spool

Example 2 — 2" Type L Copper Pipe, Plumbing Rough-In

Example 3 — 6" Schedule 80 Stainless 316, Chemical Plant

Common Pipe Weight Calculation Errors

Pipe Weight in Structural and Logistics Planning

Hanger and Support Spacing

Freight and Logistics

Structural Dead Load

Procurement and Takeoff

Frequently Asked Questions

Sources & Methodology

Related Calculators

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