What does Schedule 80 mean?

Schedule 80 identifies a specific wall thickness for a given NPS. It does not mean an 0.80 inch wall thickness; the actual value varies by size, for example 0.147 inches at 1/2 inch NPS and 0.337 inches at 4 inch NPS.

What is the wall thickness of Schedule 80 pipe?

It varies by size. Examples include 0.147 inches at 1/2 inch, 0.218 inches at 2 inch, 0.337 inches at 4 inch, and 0.432 inches at 6 inch NPS.

What is the inside diameter of Schedule 80 pipe?

ID equals OD minus twice the wall thickness. For 2 inch Schedule 80, ID equals 2.375 minus 2(0.218), or approximately 1.939 inches.

What is the outside diameter of Schedule 80 pipe?

OD is standardized for each NPS and is the same across all schedules at that size; 2 inch NPS has a 2.375 inch OD in both Schedule 40 and Schedule 80.

How much does Schedule 80 pipe weigh per foot?

It varies by size, from approximately 0.31 lb/ft at 1/8 inch NPS to over 290 lb/ft at 24 inch NPS.

What is 2 inch Schedule 80 pipe?

A steel pipe with 2 inch nominal size, 2.375 inch outside diameter, 0.218 inch wall thickness, approximately 1.939 inch inside diameter, and approximately 5.02 lb/ft weight.

What is the difference between Schedule 40 and Schedule 80?

At the same NPS, Schedule 80 has a thicker wall, smaller inside diameter, and higher weight than Schedule 40, while both share the identical outside diameter.

What is the difference between Schedule 80 and 80S?

Schedule 80 belongs to ASME B36.10M for carbon and alloy steel pipe, while Schedule 80S belongs to ASME B36.19M for stainless steel pipe. The S suffix differentiates B36.19M dimensions from B36.10M, and some values differ at particular sizes, including NPS 10 and 12.

Does Schedule 80 determine pressure rating?

No, not by itself. Schedule 80 establishes wall thickness; actual pressure capability requires material, grade, temperature, design code, corrosion allowance, and manufacturing specification together.

Is Schedule 80 steel pipe the same as Schedule 80 PVC?

They generally share outside diameter conventions but are governed by separate standards, ASME B36.10M for steel and ASTM D1785 for PVC, and are not automatically interchangeable products despite the shared Schedule 80 label.

How do I identify Schedule 80 pipe?

Check pipe markings, measure outside diameter and wall thickness, then compare against the applicable ASME B36.10M dimensional table for that NPS.

How do I calculate Schedule 80 pipe weight?

Use the formula weight per foot equals 10.6802 times wall thickness times (outside diameter minus wall thickness), both in inches, for carbon steel, then compare against the standard tabulated value.

Construction Charts

Schedule 80 Pipe Chart 2026 – NPS, OD, Wall, ID & Weight

Q: What is Schedule 80 pipe?

Schedule 80 is a standardized wall thickness designation for steel pipe under ASME B36.10M, identifying a thicker wall than Schedule 40 for each nominal pipe size.

Q: Is Schedule 80 the same as XS pipe?

XS (Extra Strong) matches Schedule 80 wall thickness for NPS 1/8 through 8. At NPS 10 and larger, XS diverges from Schedule 80 and uses its own fixed wall thickness.

August 16, 2026

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Schedule 80 Pipe Chart - NPS, OD, Wall, ID & Weight — Schedule 80 Pipe Chart

Schedule 80 Pipe Chart: OD, Wall, ID & Weight | ConcreteCalculate.com

Complete Dimensional Reference (ASME B36.10M)

Schedule 80 Pipe Chart
NPS, OD, Wall, ID & Weight

The complete NPS, DN, outside diameter, wall thickness, inside diameter, and weight reference for Schedule 80 steel pipe, in inches and millimeters.

NPS 1/8″ to 24″Inches & mmlb/ft & kg/mSch 80 vs 40 ComparisonUpdated August 2026

Reviewed by Muhammad Ramzan Babar, PhD Researcher & Calculator Developer · View Profile

⭐⭐⭐ Schedule 80 Pipe Chart: Complete Reference Table

NPS, DN, outside diameter, wall thickness, inside diameter, and weight, per ASME B36.10M.

NPS	DN	OD (in)	OD (mm)	Wall (in)	Wall (mm)	ID (in)	ID (mm)	lb/ft	kg/m
1/8″	6	0.405	10.29	0.095	2.41	0.215	5.46	0.31	0.47
1/4″	8	0.540	13.72	0.119	3.02	0.302	7.67	0.54	0.80
3/8″	10	0.675	17.14	0.126	3.20	0.423	10.74	0.74	1.10
1/2″	15	0.840	21.34	0.147	3.73	0.546	13.87	1.09	1.62
3/4″	20	1.050	26.67	0.154	3.91	0.742	18.85	1.47	2.19
1″	25	1.315	33.40	0.179	4.55	0.957	24.31	2.17	3.23
1-1/4″	32	1.660	42.16	0.191	4.85	1.278	32.46	3.00	4.46
1-1/2″	40	1.900	48.26	0.200	5.08	1.500	38.10	3.63	5.40
2″	50	2.375	60.32	0.218	5.54	1.939	49.25	5.02	7.47
2-1/2″	65	2.875	73.02	0.276	7.01	2.323	59.00	7.66	11.40
3″	80	3.500	88.90	0.300	7.62	2.900	73.66	10.25	15.26
3-1/2″	90	4.000	101.60	0.318	8.08	3.364	85.45	12.51	18.61
4″	100	4.500	114.30	0.337	8.56	3.826	97.18	14.98	22.30
5″	125	5.563	141.30	0.375	9.52	4.813	122.25	20.78	30.92
6″	150	6.625	168.27	0.432	10.97	5.761	146.33	28.57	42.52
8″	200	8.625	219.07	0.500	12.70	7.625	193.67	43.39	64.57
10″	250	10.750	273.05	0.593	15.06	9.564	242.93	64.33	95.73
12″	300	12.750	323.85	0.687	17.45	11.376	288.95	88.51	131.72
14″	350	14.000	355.60	0.750	19.05	12.500	317.50	106.13	157.95
16″	400	16.000	406.40	0.843	21.41	14.314	363.58	136.46	203.08
18″	450	18.000	457.20	0.937	23.80	16.126	409.60	170.76	254.11
20″	500	20.000	508.00	1.031	26.19	17.938	455.63	208.87	310.84
24″	600	24.000	609.60	1.218	30.94	21.564	547.73	296.36	441.03

📌

Standards basis

ASME B36.10M is the authoritative dimensional standard for welded and seamless wrought carbon and alloy steel pipe, including the Schedule 80 series. Values above were calculated and cross-verified against multiple independently published B36.10M based references for accuracy.

🚫

Schedule 80 does not mean 0.80 inch wall thickness

Schedule 80 is a standardized wall-thickness designation associated with a particular NPS, not a universal 0.80 inch dimension. Wall thickness varies substantially by size, from 0.095 inches at 1/8 inch to 1.218 inches at 24 inch, all under the same “Schedule 80” label.

⭐⭐⭐ What Is Schedule 80 Pipe?

A standardized, thicker wall designation under ASME B36.10M.

NPS and DN

The nominal size designation, in inch (NPS) or metric (DN) form.

Outside diameter (OD)

Fixed for each NPS regardless of schedule; identical to the Schedule 40 OD at the same size.

Wall thickness

Thicker than Schedule 40 at the same NPS, determined by the Schedule 80 designation.

Inside diameter (ID)

Calculated from OD and wall thickness: ID = OD minus 2 times wall thickness; smaller than Schedule 40’s ID at the same NPS.

⭐⭐⭐ Schedule 80: OD, Wall Thickness, ID & Weight Relationship

The central dimensional chain that gives this page its distinct purpose.

📐

NPS → Schedule 80 → Wall Thickness → ID → Weight

For NPS 2, OD stays fixed at 2.375 inches whether the pipe is Schedule 40 or Schedule 80. Schedule 80 increases wall thickness to 0.218 inches, reducing ID to approximately 1.939 inches and increasing plain end weight to approximately 5.02 lb/ft compared to Schedule 40’s 3.65 lb/ft.

Schedule vs wall thickness

Schedule 80 is a standardized wall thickness for a given NPS, not a universal value. 1/2 inch NPS is 0.147 inches; 2 inch NPS is 0.218 inches; 6 inch NPS is 0.432 inches, all under the same Schedule 80 label.

Schedule vs inside diameter

For the same NPS, a thicker wall directly reduces ID compared to a thinner schedule at that size.

⭐⭐⭐ Schedule 80 Pipe NPS to DN Chart

Cross-referencing inch based NPS against metric DN.

NPS	DN
1/2″	15
3/4″	20
1″	25
1-1/4″	32
1-1/2″	40
2″	50
2-1/2″	65
3″	80
4″	100
6″	150
8″	200
10″	250
12″	300
14″	350
16″	400
18″	450
20″	500
24″	600

⭐⭐⭐ Schedule 80 Pipe NPS vs Actual OD

Why isn’t 1 inch pipe actually 1 inch outside diameter?

🚫

1″ NPS ≠ 1″ OD, and 2″ NPS ≠ 2″ OD

1 inch NPS has an actual outside diameter of 1.315 inches; 2 inch NPS has an actual OD of 2.375 inches. This gap applies across NPS 12 and smaller. For NPS 14 and larger, the numerical NPS corresponds directly to the actual OD in inches.

⭐⭐⭐ Schedule 80 Pipe Inside Diameter Calculation

The formula behind every ID value in this chart.

🧮

Formula and worked example

ID = OD minus 2t. For 2 inch NPS Schedule 80: OD = 2.375 in, wall = 0.218 in. ID = 2.375 minus 2(0.218) = 2.375 minus 0.436 = 1.939 inches, matching the standard tabulated value.

⭐⭐⭐ Schedule 80 Pipe Weight Formula & Calculation

The theoretical relationship behind tabulated weight values.

🧮

Formula

W (lb/ft) = 10.6802 × t × (OD − t), where t and OD are in inches, based on carbon steel density.

Identify NPS.

Establish the nominal pipe size.

Identify Schedule 80.

Confirm the wall thickness designation.

Find OD.

Look up the standard actual outside diameter for that NPS.

Find wall thickness.

Identify the Schedule 80 wall for that NPS.

Calculate cross-sectional steel area and apply density.

Use the annular ring area between OD and ID with carbon steel density.

Compare with the applicable standard table.

Confirm the calculated result against the tabulated B36.10M value.

2 Inch Schedule 80 Calculation Example

Given: OD = 2.375 in, t = 0.218 in.W = 10.6802 x 0.218 x (2.375 minus 0.218) = 5.02 lb/ft, matching the published reference value.

See the Steel Pipe Weight Chart for the complete weight reference across every schedule.

⭐⭐⭐ Schedule 80 Pipe by NPS

Concise individual reference for the most commonly searched sizes.

1/2 inch Schedule 80 ⭐⭐⭐

OD 0.840 in, wall 0.147 in, ID 0.546 in, 1.09 lb/ft (1.62 kg/m).

3/4 inch Schedule 80

OD 1.050 in, wall 0.154 in, ID 0.742 in, 1.47 lb/ft (2.19 kg/m).

1 inch Schedule 80 ⭐⭐⭐

OD 1.315 in, wall 0.179 in, ID 0.957 in, 2.17 lb/ft (3.23 kg/m).

1-1/2 inch Schedule 80 ⭐⭐⭐

OD 1.900 in, wall 0.200 in, ID 1.500 in, 3.63 lb/ft (5.40 kg/m).

2 inch Schedule 80 ⭐⭐⭐

DN 50, OD 2.375 in, wall 0.218 in, ID 1.939 in, 5.02 lb/ft (7.47 kg/m).

3 inch Schedule 80 ⭐⭐⭐

OD 3.500 in, wall 0.300 in, ID 2.900 in, 10.25 lb/ft (15.26 kg/m).

4 inch Schedule 80 ⭐⭐⭐

OD 4.500 in, wall 0.337 in, ID 3.826 in, 14.98 lb/ft (22.30 kg/m).

6 inch Schedule 80 ⭐⭐⭐

OD 6.625 in, wall 0.432 in, ID 5.761 in, 28.57 lb/ft (42.52 kg/m).

8 inch Schedule 80 ⭐⭐⭐

OD 8.625 in, wall 0.500 in, ID 7.625 in, 43.39 lb/ft (64.57 kg/m).

12 inch Schedule 80 ⭐⭐⭐

OD 12.750 in, wall 0.687 in, ID 11.376 in, 88.51 lb/ft (131.72 kg/m).

16 inch Schedule 80

OD 16.000 in, wall 0.843 in, ID 14.314 in, 136.46 lb/ft (203.08 kg/m).

24 inch Schedule 80

OD 24.000 in, wall 1.218 in, ID 21.564 in, 296.36 lb/ft (441.03 kg/m).

⭐⭐⭐ Schedule 80 vs Schedule 40

The single most important comparison for this page.

Property	Schedule 40	Schedule 80
NPS	Same	Same
OD	Same	Same
Wall	Thinner	Thicker
ID	Larger	Smaller
Weight	Lower	Higher

NPS 2	Wall (in)	ID (in)	Weight (lb/ft)
Schedule 40	0.154	2.067	3.65
Schedule 80	0.218	1.939	5.02

See the complete Schedule 40 Pipe Chart for the full dimensional series across all sizes.

⭐⭐⭐ Schedule 80 vs Schedule 160, XS & XXS

Where Schedule 80 sits within the broader wall thickness system.

Schedule 80 vs Schedule 160

Schedule 160 has a thicker wall, smaller ID, and higher weight than Schedule 80 at the same NPS, using more material for heavier duty or higher pressure applications.

Schedule 80 vs XS ⭐⭐⭐

XS (Extra Strong) corresponds to Schedule 80 for NPS 1/8 through 8. At NPS 10 and larger, XS diverges from Schedule 80 and uses its own fixed wall thickness (0.500 in XS versus 0.687 in Schedule 80 at 12 inch NPS). Phrase this as “Schedule 80 corresponds to XS for applicable sizes,” not a universal equivalence.

Schedule 80 vs XXS

XXS (Double Extra Strong) has substantially thicker walls than Schedule 80 for applicable sizes, used for the heaviest duty applications within a limited NPS range.

Comparison of 2-inch nominal pipe Schedule 80, Schedule 160, XS, and XXS showing wall thickness, inside diameter, outside diameter, weight, pressure rating, and applications.

⭐⭐⭐ Schedule 80 vs Schedule 80S

A distinct standard, not simply a stainless steel relabeling.

Feature	Schedule 80	Schedule 80S
Primary standard	ASME B36.10M	ASME B36.19M
Material context	Wrought carbon/alloy steel pipe	Stainless steel pipe
S suffix	No	Yes
Dimensions	Per B36.10M	Per B36.19M, own table

🚫

Schedule 80 is not automatically Schedule 80S

The S suffix specifically differentiates ASME B36.19M stainless steel dimensions from ASME B36.10M carbon steel dimensions. Some B36.19M values differ from the equivalent B36.10M schedule at particular sizes, including NPS 10 and 12 for Schedule 80S. Always confirm which standard governs the actual material before assuming equivalence.

Comparison of carbon steel Schedule 80 and stainless steel Schedule 80S pipe showing wall thickness, inside and outside diameters, corrosion resistance, and typical applications.

⭐⭐⭐ Schedule 80 Pipe Pressure Rating

Schedule 80 is not itself a universal pressure rating.

🚫

Does Schedule 80 mean high pressure? Not automatically.

Thicker walls can provide greater pressure capacity for a given material and diameter, but actual allowable pressure requires material, grade, temperature, wall thickness, the applicable design code, manufacturing specification, corrosion allowance, and service conditions together. Never state “Schedule 80 equals X psi.” See the Pipe Pressure Rating Chart for the complete material-specific framework.

⭐⭐⭐ Schedule 80 Pipe Applications & Material Grades

Common uses, with the important dimension-versus-material distinction.

Common applications

Industrial piping
Utility piping
Water systems
Process piping
Compressed air
Mechanical systems
Construction piping

Schedule vs material grade

Schedule 80 describes dimensions only. Material grade (carbon steel, alloy steel, specific ASTM or API product grades) is a separate specification determining strength, corrosion resistance, and temperature capability. Not every Schedule 80 pipe has identical mechanical properties.

⭐⭐⭐ Schedule 80 Steel vs PVC vs Copper

The same phrase applies to fundamentally different products.

Product	Governing Standard	Material
Steel Schedule 80	ASME B36.10M	Carbon/alloy steel
PVC Schedule 80	ASTM D1785	Polyvinyl chloride

🚫

Not automatically interchangeable

Steel and PVC Schedule 80 generally share OD conventions but are governed by entirely separate standards and materials. See the PVC Pipe Size Chart for the PVC-specific reference.

Copper tube uses Type K/L/M designations, an entirely different system from steel schedules; see the Copper Pipe Size Chart.

⭐⭐⭐ Schedule 80 Pipe Flow Area & Volume

ID determines flow area, always smaller for Schedule 80 than Schedule 40 at the same NPS.

🧮

Flow area formula

A = πD²/4, using the actual Schedule 80 ID.

NPS	Sch 80 ID (in)	Flow Area (in²)
1/2″	0.546	0.234
1″	0.957	0.719
2″	1.939	2.95
4″	3.826	11.50
6″	5.761	26.06
8″	7.625	45.66

⭐⭐⭐ Schedule 80 Pipe Weight With Water & Coating

Bare pipe weight is not installed system weight.

NPS	Empty Weight (lb/ft)	Water Weight (lb/ft)	Filled Weight (lb/ft)
2″	5.02	0.87	5.89
4″	14.98	3.26	18.24
6″	28.57	7.28	35.85

⚠️

Coating, insulation, and fittings add further mass

Standard pipe weight does not automatically represent coating, insulation, cladding, fittings, valves, or contents. Support design should consider empty pipe, operating contents, insulation, fittings, valves, and the hydrotest condition together, not bare pipe weight alone.

⭐⭐⭐ Identifying & Measuring Schedule 80 Pipe

Practical field methods for confirming Schedule 80.

Read pipe markings.

Check for printed manufacturer, NPS, schedule, grade, standard, heat/lot, and certification information.

Identify NPS.

Confirm nominal pipe size from markings or by measuring OD.

Measure OD.

Use a caliper or tape at the largest point.

Measure wall thickness.

Use a caliper/micrometer at an accessible end, or an ultrasonic thickness gauge for installed pipe.

Determine ID.

Measure directly where accessible, or calculate as ID = OD minus 2t.

Compare with the applicable standard and verify material.

Match dimensions against ASME B36.10M for that NPS and confirm the material specification.

⭐⭐⭐ Schedule 80 Pipe Standards & Tolerances

Authoritative sourcing and manufacturing considerations.

ASME B36.10M

The primary dimensional reference for welded and seamless wrought carbon and alloy steel pipe, providing NPS, OD, wall thickness, schedules, and plain end weight/mass.

ASME B36.19M

The separate stainless steel pipe standard using S suffix schedules.

Manufacturing tolerances

Nominal dimensions are not necessarily identical to the measured dimensions of every manufactured pipe; OD and wall thickness both carry manufacturing tolerance. Use the applicable product specification and manufacturer documentation for actual procurement.

⭐⭐⭐ Schedule 80 Pipe vs Structural HSS

A piping dimensional designation, not a structural design framework.

🚫

Do not automatically use Schedule 80 as a structural design table

Schedule 80 pipe is a piping dimensional designation under ASME B36.10M. Structural HSS uses a different structural product and design framework, potentially with different dimensional standards. Do not use a Schedule 80 pipe table for structural design purposes without confirming the applicable structural specification.

⭐⭐⭐ Schedule 80 Pipe Visual Guide

Original diagrams explaining Schedule 80 anatomy and key comparisons.

Schedule 80 pipe cross-section: same OD as Schedule 40 at a given NPS, but noticeably thicker wall and smaller ID.

Same 2 inch NPS and OD, but Schedule 80 uses a noticeably thicker wall than Schedule 40.

Schedule 80 (carbon steel, B36.10M) and Schedule 80S (stainless steel, B36.19M) are governed by different standards.

⭐⭐⭐ Schedule 80 Pipe Worked Examples

These examples demonstrate the calculation and comparison process.

1. Calculate ID

Given: 2 inch NPS Schedule 80, OD = 2.375 in, wall = 0.218 in.Result: ID = 1.939 in.

2. Find Weight

Given: 2 inch Schedule 80.Result: approximately 5.02 lb/ft.

3. Calculate 20 Foot Weight

Given: 2 inch Schedule 80 at 5.02 lb/ft, 20 foot length.Result: 5.02 x 20 = approximately 100.4 lb.

4. Convert lb/ft to kg/m

Given: 5.02 lb/ft.Result: 5.02 x 1.48816 = 7.47 kg/m.

5. Compare Schedule 40 and 80

Given: 4 inch NPS in both schedules.Result: Sch 40: 0.237 in wall, 4.026 in ID, 10.79 lb/ft. Sch 80: 0.337 in wall, 3.826 in ID, 14.98 lb/ft.

6. Calculate Flow Area

Given: 2 inch Schedule 80, ID = 1.939 in.Result: A = π(1.939)²/4 = 2.95 in².

⭐⭐⭐ Common Schedule 80 Pipe Mistakes

Most Schedule 80 errors trace back to one of these misunderstandings.

❌ Thinking Schedule 80 means 0.80 inch wall

Wall thickness varies substantially by NPS.

❌ Assuming Schedule 80 has one wall thickness for every NPS

Every NPS has its own specific Schedule 80 wall value.

❌ Confusing NPS with OD

NPS 12 and smaller have an actual OD larger than the nominal number.

❌ Confusing steel Schedule 80 with PVC Schedule 80

Different materials and governing standards despite the shared label.

❌ Confusing Schedule 80 with 80S

Carbon steel versus stainless steel, different standards.

❌ Assuming Schedule 80 equals a universal PSI rating

Pressure rating requires a full design calculation, not a schedule lookup.

❌ Treating XS as universally identical without checking size

XS matches Schedule 80 only through NPS 8, then diverges.

❌ Ignoring material grade, temperature, and corrosion allowance

All three affect actual design suitability beyond nominal dimensions.

❌ Confusing lb/ft with total pipe weight

Multiply by actual length for total quantity.

❌ Mixing pipe and structural HSS

Different dimensional and design standards may apply.

Frequently Asked Questions

A standardized wall thickness designation for steel pipe under ASME B36.10M, thicker than Schedule 40 at the same NPS.

A specific wall thickness tied to NPS; not a fixed 0.80 inch dimension.

Varies by size, from 0.095 inches at 1/8 inch to 1.218 inches at 24 inch.

ID = OD minus 2t; for 2 inch NPS, approximately 1.939 inches.

Standardized for each NPS, identical to Schedule 40’s OD at the same size.

Varies by size, from approximately 0.31 lb/ft at 1/8 inch to over 290 lb/ft at 24 inch.

2.375 inch OD, 0.218 inch wall, approximately 1.939 inch ID, approximately 5.02 lb/ft.

Same OD, but Schedule 80 has a thicker wall, smaller ID, and higher weight.

Yes for NPS 1/8 through 8; they diverge at NPS 10 and larger.

80S is the separate stainless steel designation under ASME B36.19M, with some differing values at certain sizes.

No, not by itself; pressure rating requires material, temperature, and code together.

They generally share OD conventions but are governed by separate standards (B36.10M vs D1785).

Check markings, measure OD and wall thickness, then compare against the standard table.

W (lb/ft) = 10.6802 x t x (OD minus t), then compare against the tabulated standard value.

ASME B36.10M.

📄 Download Schedule 80 Pipe Chart PDF

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NPS, DN, OD, OD mmWall thickness, wall mmID, ID mmlb/ft, kg/mNPS/DN conversionSchedule 40 vs 80Schedule 80 vs 160XS explanation80 vs 80S explanationID formulaWeight formulaWorked examplesStandards note

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Schedule 80 Pipe ChartNPS, OD, Wall, ID & Weight