What are the standard PVC pipe sizes?

Common nominal PVC pipe sizes range from 1/2 inch through 12 inch and larger, including 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3, 4, 6, 8, 10 and 12 inch, each with a standardized actual outside diameter under ASTM D1785.

What is the outside diameter of 1/2 inch PVC pipe?

0.840 inches, the same actual outside diameter used across Schedule 40, 80 and 120 at that nominal size.

What is the inside diameter of 1/2 inch Schedule 40 PVC?

Approximately 0.602 inches, based on a 0.840 inch outside diameter and 0.109 inch minimum wall thickness.

What is the outside diameter of 2 inch PVC pipe?

2.375 inches, the same actual outside diameter across Schedule 40, 80 and 120 at 2 inch nominal size.

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

At the same nominal size, Schedule 80 has a thicker wall and smaller inside diameter than Schedule 40, while both share the identical outside diameter, resulting in higher pressure capability and more weight for Schedule 80.

What is the wall thickness of Schedule 40 PVC?

It varies by size. For example, 1/2 inch Schedule 40 has a minimum wall thickness of about 0.109 inches, while 4 inch Schedule 40 has a minimum wall thickness of about 0.237 inches.

What is the wall thickness of Schedule 80 PVC?

Also varies by size. For example, 1/2 inch Schedule 80 has a minimum wall thickness of about 0.147 inches, while 4 inch Schedule 80 has a minimum wall thickness of about 0.337 inches.

Is PVC pipe size based on inside or outside diameter?

PVC Schedule 40/80/120 pipe under ASTM D1785 is based on a standardized outside diameter for each nominal size, with inside diameter varying by schedule since wall thickness changes while OD stays fixed.

Is 1/2 inch PVC actually 1/2 inch in diameter?

No. Nominal 1/2 inch PVC has an actual outside diameter of 0.840 inches, not 0.500 inches. Nominal pipe size is a standardized designation, not a direct measurement.

What is the difference between PVC pipe and PVC tubing?

PVC pipe uses nominal pipe sizing where the actual outside diameter differs from the nominal label, following iron pipe size conventions. PVC tubing is typically sized directly by its actual outside diameter, without the same nominal versus actual distinction.

What is the difference between PVC Schedule 40 and SDR pipe?

Schedule 40 pipe under ASTM D1785 uses a standardized wall thickness series where thickness increases with pipe size. SDR pipe under ASTM D2241 maintains a constant ratio of outside diameter to wall thickness, so wall thickness scales proportionally with diameter rather than following the Schedule series.

What PVC pipe sizes are covered by ASTM D1785?

ASTM D1785 covers PVC Schedule 40, 80 and 120 pipe across a range of nominal pipe sizes, though not every schedule is available at every size; Schedule 120 in particular is offered in a more limited size range than 40 and 80.

Can PVC and CPVC pipe sizes be used interchangeably?

PVC and CPVC often share the same nominal sizes and outside diameters, but they are chemically different materials governed by separate standards (ASTM D1785 for PVC and ASTM F441 for CPVC) with different wall thickness and temperature ratings, so fittings and pressure ratings should not be assumed interchangeable.

How do I measure PVC pipe size?

Measure the actual outside diameter with a caliper or tape measure, compare it against the standard nominal size table, then check any printed pipe markings to confirm nominal size, schedule, and standard designation.

How do I choose the right PVC pipe size?

Determine required flow rate, pressure, length, fluid, and temperature, select a candidate inside diameter to meet velocity and pressure drop requirements, then confirm an available nominal size, schedule or SDR, and check applicable code and fitting compatibility.

Construction Charts

PVC Pipe Size Chart 2026 – OD, ID, Schedule 40/80/120 & SDR

August 15, 2026

0 1 16 minutes read

PVC Pipe Size Chart: OD, ID, Schedule 40/80/120 & SDR | ConcreteCalculate.com

PVC Pipe Sizing Reference (ASTM D1785 / D2241)

PVC Pipe Size Chart
OD, ID, Schedule 40/80/120 & SDR

Nominal PVC size is a standardized designation, not a direct measurement. This chart provides actual OD, ID and wall thickness by schedule and SDR, based on ASTM D1785 and D2241.

1/2″ to 12″ SizesSchedule 40, 80 & 120SDR Pressure PipeNominal vs Actual ODUpdated August 2026

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

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1/2 inch PVC is not 0.500 inches in diameter

Nominal PVC size follows iron pipe size (IPS) convention. 1/2 inch PVC has an actual outside diameter of 0.840 inches. This gap between nominal label and actual measurement exists across every PVC pipe size and is one of the most common sources of confusion for first-time buyers.

⭐⭐⭐ PVC Pipe Size Chart: Quick Reference

Dimensions per ASTM D1785 for PVC Schedule 40 and 80 pipe.

Nominal Size	OD	Sch 40 ID	Sch 80 ID	Sch 40 Wall	Sch 80 Wall
1/2″	0.840″	0.602″	0.526″	0.109″	0.147″
3/4″	1.050″	0.804″	0.722″	0.113″	0.154″
1″	1.315″	1.029″	0.937″	0.133″	0.179″
1-1/4″	1.660″	1.360″	1.258″	0.140″	0.191″
1-1/2″	1.900″	1.590″	1.470″	0.145″	0.200″
2″	2.375″	2.047″	1.913″	0.154″	0.218″
2-1/2″	2.875″	2.445″	2.289″	0.203″	0.276″
3″	3.500″	3.042″	2.864″	0.216″	0.300″
4″	4.500″	3.998″	3.786″	0.237″	0.337″
5″	5.563″	4.973″	4.719″	0.258″	0.375″
6″	6.625″	5.945″	5.669″	0.280″	0.432″
8″	8.625″	7.789″	7.565″	0.322″	0.500″
10″	10.750″	9.760″	9.494″	0.365″	0.593″
12″	12.750″	11.538″	11.184″	0.406″	0.687″

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Standards basis

Dimensions follow ASTM D1785, the governing standard for PVC Schedule 40, 80 and 120 pipe, intended for the distribution of pressurized liquids compatible with the piping material. Inside diameters shown are approximate values based on average outside diameter minus twice the minimum wall thickness.

⭐ What Is PVC Pipe?

PVC stands for polyvinyl chloride, a widely used thermoplastic piping material.

PVC pressure pipe

Designed and rated for pressurized liquid distribution, such as water supply, under ASTM D1785 or ASTM D2241.

PVC drainage/DWV pipe

Non-pressure products used for drain, waste, and vent applications, governed by separate DWV-specific standards, distinct from pressure pipe.

Common applications

Water supply, irrigation, drainage, sewer, electrical conduit, and industrial piping.

Why PVC sizing differs from tubing

PVC pipe follows nominal iron pipe size (IPS) convention, where the labeled size does not equal actual outside diameter. PVC tubing, by contrast, is typically sized directly by actual OD.

⭐⭐⭐ PVC Nominal Size vs Actual Outside Diameter

This is the single most important concept for anyone shopping for PVC pipe or fittings.

Nominal Size	Actual OD (in)
1/2″	0.840
3/4″	1.050
1″	1.315
1-1/4″	1.660
1-1/2″	1.900
2″	2.375
3″	3.500
4″	4.500
6″	6.625
8″	8.625
10″	10.750
12″	12.750

This same OD applies regardless of schedule; a 2 inch pipe measures 2.375 inches OD whether it is Schedule 40, 80, or 120. Only wall thickness and therefore ID change between schedules at a fixed nominal size.

⭐⭐⭐ PVC Schedule Explained

ASTM D1785 covers PVC Schedule 40, 80, and 120 pipe, each using the same OD series with progressively thicker walls.

Schedule 40

The thinnest wall of the three, most common for general residential and light commercial pressure applications.

Schedule 80

Thicker wall at the same OD, providing greater pressure capability and often specified for industrial, chemical, or higher-pressure service.

Schedule 120

The thickest wall of the three, available in a more limited range of nominal sizes than Schedule 40 and 80.

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Relationship to ID

Since OD stays fixed for a given nominal size across all three schedules, increasing schedule number reduces inside diameter. A 2 inch pipe has a larger bore in Schedule 40 (2.047 in ID) than in Schedule 80 (1.913 in ID).

⭐⭐⭐ PVC Schedule 40 Pipe Size Chart

The most common PVC pressure pipe dimension series.

Nominal Size	OD (in)	Min. Wall (in)	Avg. ID (in)
1/8″	0.405	0.068	0.249
1/4″	0.540	0.088	0.344
3/8″	0.675	0.091	0.473
1/2″	0.840	0.109	0.602
3/4″	1.050	0.113	0.804
1″	1.315	0.133	1.029
1-1/4″	1.660	0.140	1.360
1-1/2″	1.900	0.145	1.590
2″	2.375	0.154	2.047
3″	3.500	0.216	3.042
4″	4.500	0.237	3.998
6″	6.625	0.280	5.945
8″	8.625	0.322	7.789

Pressure rating is a secondary reference tied to the specific product’s design stress designation and service conditions; see the Pipe Pressure Rating Chart for material-specific pressure data.

⭐⭐⭐ PVC Schedule 80 Pipe Size Chart

The same OD series as Schedule 40, with thicker walls and smaller ID at each size.

Nominal Size	OD (in)	Min. Wall (in)	Avg. ID (in)
1/2″	0.840	0.147	0.526
3/4″	1.050	0.154	0.722
1″	1.315	0.179	0.937
1-1/4″	1.660	0.191	1.258
1-1/2″	1.900	0.200	1.470
2″	2.375	0.218	1.913
3″	3.500	0.300	2.864
4″	4.500	0.337	3.786
6″	6.625	0.432	5.669
8″	8.625	0.500	7.565

⭐⭐ PVC Schedule 120 Pipe Size Chart

Schedule 120 is not available across the same broad size range as Schedule 40 and 80.

⚠️

Limited size availability

ASTM D1785 covers Schedule 120 alongside 40 and 80, but Schedule 120 is offered in a more limited range of nominal sizes and is less commonly stocked. Always confirm actual availability with the specific manufacturer before specifying Schedule 120 for a project.

Nominal Size	OD (in)	Approx. Wall (in)
1/2″	0.840	0.170
3/4″	1.050	0.184
1″	1.315	0.219
2″	2.375	0.250
4″	4.500	0.437

⭐⭐⭐ PVC Schedule 40 vs 80 vs 120

Same OD, progressively thicker walls, progressively smaller bore.

2 Inch PVC	OD (in)	Wall (in)	ID (in)
Schedule 40	2.375	0.154	2.047
Schedule 80	2.375	0.218	1.913
Schedule 120	2.375	0.250	1.875

Feature	Schedule 40	Schedule 80
OD	Same for corresponding size	Same for corresponding size
Wall	Thinner	Thicker
ID	Larger	Smaller
Weight	Lower	Higher
Pressure capability	Product/temperature dependent	Product/temperature dependent

⭐⭐⭐ PVC SDR Pipe (ASTM D2241)

SDR pressure pipe is a completely separate dimensional system from Schedule 40/80/120 and should never be merged into the same table.

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SDR formula

SDR = Outside Diameter divided by Wall Thickness. Unlike Schedule pipe, SDR pipe maintains this constant ratio, so wall thickness increases proportionally with diameter rather than following the standardized Schedule series.

Nominal Size	OD (in)	SDR 13.5 Wall	SDR 21 Wall	SDR 26 Wall
1/2″	0.840	0.062	—	—
3/4″	1.050	0.078	0.060	—
1″	1.315	0.097	0.063	0.060
1-1/4″	1.660	0.123	0.079	0.064
1-1/2″	1.900	0.141	0.090	0.073
2″	2.375	0.176	0.113	0.091
2-1/2″	2.875	0.213	0.137	0.110
3″	3.500	0.259	0.167	0.135
4″	4.500	0.333	0.214	0.173
6″	6.625	0.491	0.316	0.255

SDR	Reference Pressure Rating (PR)
SDR 13.5	315 psi
SDR 17	250 psi
SDR 21	200 psi
SDR 26	160 psi
SDR 32.5	125 psi

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Standards basis

ASTM D2241 covers PVC SDR-PR (Standard Dimension Ratio, Pressure Rated) pipe. ASTM F645 identifies D1785 and D2241 as separate PVC pipe specifications within the broader thermoplastic water-pressure piping framework, confirming these are genuinely distinct products, not variations of the same dimensional system.

⭐⭐⭐ PVC Schedule vs SDR

These two dimensioning philosophies should never be assumed interchangeable.

Feature	Schedule (ASTM D1785)	SDR (ASTM D2241)
Dimension basis	Standardized wall thickness series	Constant OD to wall thickness ratio
Examples	40, 80, 120	13.5, 17, 21, 26, 32.5
Typical application	Pressure pipe and DWV-adjacent uses, general plumbing	Pressure pipe systems, often larger diameter water service
Wall thickness trend	Increases in defined steps by size	Scales proportionally with diameter at each SDR
Interchangeability	Not automatic with SDR	Not automatic with Schedule

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Never merge Schedule and SDR dimensions

A Schedule 40 pipe and an SDR 21 pipe of the same nominal size can have different wall thickness and ID, and are governed by different ASTM standards. Confirm which dimensional system a project or fitting requires before ordering.

⭐⭐⭐ PVC Pipe Size by Nominal Diameter

Quick individual reference for the most commonly searched PVC sizes.

1/2 inch PVC ⭐⭐⭐

OD 0.840 in. Sch 40: 0.109 in wall, 0.602 in ID. Sch 80: 0.147 in wall, 0.526 in ID. Common for small water lines and equipment connections.

3/4 inch PVC

OD 1.050 in. Sch 40: 0.113 in wall, 0.804 in ID. Sch 80: 0.154 in wall, 0.722 in ID. Common residential water applications.

1 inch PVC

OD 1.315 in. Sch 40: 0.133 in wall, 1.029 in ID. Sch 80: 0.179 in wall, 0.937 in ID. Larger supply lines.

1-1/4 inch PVC

OD 1.660 in. Sch 40: 0.140 in wall, 1.360 in ID. Sch 80: 0.191 in wall, 1.258 in ID.

1-1/2 inch PVC

OD 1.900 in. Sch 40: 0.145 in wall, 1.590 in ID. Sch 80: 0.200 in wall, 1.470 in ID. Larger plumbing and irrigation applications.

2 inch PVC ⭐⭐⭐

OD 2.375 in. Sch 40: 0.154 in wall, 2.047 in ID. Sch 80: 0.218 in wall, 1.913 in ID. A very common residential and irrigation size.

3 inch PVC

OD 3.500 in. Sch 40: 0.216 in wall, 3.042 in ID. Sch 80: 0.300 in wall, 2.864 in ID. Common for drainage and larger piping.

4 inch PVC ⭐⭐⭐

OD 4.500 in. Sch 40: 0.237 in wall, 3.998 in ID. Sch 80: 0.337 in wall, 3.786 in ID. Common for drainage, sewer and larger construction piping.

6 inch PVC

OD 6.625 in. Sch 40: 0.280 in wall, 5.945 in ID. Sch 80: 0.432 in wall, 5.669 in ID. Distinguish pressure pipe dimensions from DWV products.

8, 10, 12 inch PVC

OD 8.625, 10.750, and 12.750 in respectively. Used in larger drainage, sewer, and industrial pressure piping applications.

1/2 vs 3/4 inch PVC

Flow area roughly doubles from 1/2 to 3/4 inch Schedule 40 (0.285 in² vs 0.507 in²), significant for flow-critical applications.

1-1/2 vs 2 inch PVC

A common upgrade path for irrigation and drainage where increased flow capacity is needed without a large jump in nominal size.

⭐⭐⭐ PVC Pipe Size in Inches and mm

A conversion reference; the nominal U.S. PVC size remains the actual designation regardless of unit.

Nominal Size	OD (in)	OD (mm)	Sch 40 ID (in)	Sch 40 ID (mm)
1/2″	0.840	21.34	0.602	15.29
3/4″	1.050	26.67	0.804	20.42
1″	1.315	33.40	1.029	26.14
1-1/4″	1.660	42.16	1.360	34.54
1-1/2″	1.900	48.26	1.590	40.39
2″	2.375	60.33	2.047	52.00
3″	3.500	88.90	3.042	77.27
4″	4.500	114.30	3.998	101.55

⭐⭐⭐ Measuring & Identifying PVC Pipe

The full workflow for identifying an unmarked or unknown PVC pipe.

Clean the pipe.

Remove dirt or debris that could affect measurement accuracy.

Measure outside diameter.

Use a caliper, tape measure, or outside micrometer at the largest point.

Record the measurement.

Note the exact reading for comparison.

Compare with nominal OD.

Match against the standard nominal size table above.

Determine schedule.

Measure wall thickness or check printed markings to identify Schedule 40, 80, or 120.

Verify ID and wall if necessary.

Calculate using t = (OD minus ID) / 2 or ID = OD minus 2t for confirmation.

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Circumference method for large pipe

For larger pipe where direct diameter measurement is difficult, measure circumference with a tape and calculate OD = Circumference ÷ π. This is a geometric approximation method, useful when a caliper cannot span the full diameter.

⭐⭐⭐ PVC Pipe Markings

Printed pipe markings are the fastest reliable identification method when legible.

Marking Element	Example	Meaning
Manufacturer	Company name/logo	Identifies the producer for warranty and spec lookup
Nominal size	2 IN	Standardized nominal designation
Material designation	PVC 1120	Cell classification identifying material formulation
Schedule	SCH 40	Wall thickness series
ASTM standard	ASTM D1785	Governing product specification
Pressure/product info	PR 200 PSI @ 73F	Product-specific pressure rating and reference temperature
NSF marking	NSF-pw	Certification for potable water use, where applicable

PVC pipe markings explained with material type, nominal size, Schedule 40, ASTM D1785, pressure rating, and manufacturing details

⭐⭐⭐ PVC Pipe Size Standards

Multiple ASTM standards govern different PVC pipe and fitting products.

Standard	Covers
ASTM D1785	PVC Schedule 40, 80 and 120 pipe, intended for distribution of pressurized liquids
ASTM D2241	PVC SDR-PR (Standard Dimension Ratio, Pressure Rated) pipe
ASTM D2466	PVC Schedule 40 socket-type fittings
ASTM D2467	PVC Schedule 80 socket-type fittings
ASTM D2464	PVC Schedule 80 threaded fittings
ASTM F645	Guide for selection, design, and installation of thermoplastic water-pressure piping systems, listing D1785 and D2241 as separate specifications

⭐⭐⭐ PVC vs CPVC Pipe

Sharing a nominal size does not make PVC and CPVC pipe or fittings interchangeable.

Feature	PVC	CPVC
Governing standard	ASTM D1785	ASTM F441
Temperature capability	Lower, generally suitable to about 140°F	Higher, commonly cited to about 180 to 200°F
1/2 in Sch 40 OD	0.840 in	0.840 in (same nominal OD)
Wall thickness at same schedule	Material-specific per D1785	Can differ from PVC despite shared nominal label per F441

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Do not assume interchangeability

PVC and CPVC often share nominal sizes and outside diameters, allowing similar fitting appearance, but they are chemically distinct materials with separate governing standards, different wall dimensions in some cases, and very different temperature ratings. Never mix PVC and CPVC fittings on the same joint, and always confirm the correct material-specific pressure rating.

⭐⭐⭐ PVC Pressure Pipe vs DWV Pipe

These are not automatically interchangeable products, despite both being labeled PVC.

Feature	PVC Pressure Pipe	PVC DWV Pipe
Application	Pressurized water supply and similar service	Drain, waste, and vent (gravity flow, non-pressure)
Wall thickness	Per Schedule 40/80/120 (D1785) or SDR (D2241)	Product-specific DWV standard, often thinner than pressure-rated equivalents
Product standard	ASTM D1785 or D2241	Separate DWV-specific ASTM standards
Fitting system	Schedule 40/80 pressure fittings (D2466, D2467, D2464)	DWV-specific fittings, not interchangeable with pressure fittings

⚠️

Never assume interchangeability

Do not substitute DWV pipe for pressure applications or vice versa. Confirm the specific product standard printed on the pipe before use in any pressurized system.

⭐⭐⭐ PVC Pipe Size, Flow & Pressure

Inside diameter, not nominal size, determines actual flow behavior.

🧮

Flow area formula

Cross-sectional flow area A = πD²/4, using actual inside diameter. A thicker-walled schedule at the same nominal size reduces available flow area.

2 Inch PVC	ID (in)	Flow Area (in²)
Schedule 40	2.047	3.29
Schedule 80	1.913	2.87

Size vs pressure rating

Nominal size, schedule, wall thickness, material designation, and temperature together determine actual pressure rating; size alone never establishes it. See the Pipe Pressure Rating Chart for material-specific ratings.

Pressure drop factors

Pressure drop through a run of pipe depends on ID, flow rate, length, fluid properties, temperature, fittings, and internal roughness, not nominal pipe size alone.

⭐⭐⭐ PVC Fittings & Applications

Fitting selection follows nominal pipe size, but actual dimensions still depend on the applicable fitting standard.

Socket fittings

Solvent-welded fittings matching Schedule 40 (ASTM D2466) or Schedule 80 (ASTM D2467) socket dimensions for the corresponding nominal pipe size.

Threaded fittings

Governed by ASTM D2464 for Schedule 80 threaded PVC fittings; note that threading reduces the effective pressure rating compared to solvent-welded joints.

Common fitting types

Couplings, elbows, tees, reducers, caps, and adapters, each sized to match the corresponding nominal pipe OD for a proper socket or thread fit.

Fitting size matching

Always match fitting nominal size and schedule to the pipe; a Schedule 40 fitting is not dimensionally identical to a Schedule 80 fitting at the same nominal label.

PVC Schedule 40 pipe installed in a construction site trench for drainage

Title: PVC Pipe Installation for Construction Site Drainage

⭐⭐⭐ How to Choose PVC Pipe Size

A practical selection workflow rather than picking a size by habit.

Determine required flow rate.

Establish the volume of fluid that must move through the system.

Determine required velocity and pressure drop.

Set acceptable limits for the specific application.

Select a candidate inside diameter.

Choose an ID that satisfies the flow and velocity requirement.

Check available nominal size.

Match the candidate ID to a standard nominal size and schedule.

Check schedule or SDR and pressure rating.

Confirm the selected product meets the required pressure and temperature.

Check fittings.

Confirm compatible fittings exist for the chosen nominal size and schedule.

Verify code and manufacturer requirements.

Confirm the selection satisfies the applicable plumbing or piping code.

PVC for water flow

Flow rate, velocity, ID, friction loss, and pressure together determine appropriate size; never select size without knowing required flow and system conditions.

PVC for irrigation

Flow, pressure, pipe length, elevation change, fittings, and sprinkler demand all factor into irrigation sizing.

PVC for drainage ⭐⭐

Gravity-flow drainage uses slope and DWV-specific standards rather than pressure pipe criteria; keep drainage sizing separate from pressure water piping.

PVC for construction ⭐⭐⭐

Water lines, drainage, irrigation, concrete equipment connections, and temporary construction-site plumbing each call for confirming the correct pressure or DWV product for that specific use.

⭐⭐⭐ PVC Pipe Size Visual Guide

Original diagrams explaining PVC anatomy, schedule comparison, and nominal size versus actual OD.

PVC pipe cross-section: outside diameter (OD), wall thickness, inside diameter (ID), and centerline.

Same nominal size and OD, but Schedule 80 has a noticeably thicker wall and smaller bore than Schedule 40.

1/2 inch nominal PVC pipe measures 0.840 inches actual outside diameter, not 0.500 inches.

🖼️

Suggested photos to add for betterment

See the itemized image list below for exact placement, subject and caption for each recommended photograph.

⭐⭐⭐ PVC Pipe Size Worked Examples

These examples demonstrate the identification and calculation process.

1. Identify 1/2 Inch PVC

Given: an unmarked pipe with a measured OD of approximately 0.840 inches.Result: this matches the standard 1/2 inch nominal PVC OD; confirm schedule by measuring wall thickness or checking any legible marking.

2. Calculate ID

Given: OD = 2.375 in, wall = 0.154 in.Result: ID = 2.375 minus 2(0.154) = 2.067 in, close to the published 2.047 in average ID for 2 inch Schedule 40.

3. Schedule 40 vs Schedule 80

Given: 2 inch PVC in both schedules.Result: Sch 40 has 0.154 in wall and 2.047 in ID; Sch 80 has 0.218 in wall and 1.913 in ID. Same 2.375 in OD, different wall and bore.

4. Convert PVC OD to mm

Given: 2.375 inches.Result: 2.375 x 25.4 = 60.33 mm.

5. Identify PVC From Markings

Given: a pipe marked “2 IN SCH 40 PVC 1120 ASTM D1785 PR 280 PSI @73F NSF-pw.”Result: 2 inch nominal size, Schedule 40, PVC cell classification 1120, governed by ASTM D1785, rated 280 psi at 73 degrees Fahrenheit, and certified for potable water.

⭐⭐⭐ Common PVC Pipe Size Mistakes

Most PVC sizing errors trace back to one of these misunderstandings.

❌ Assuming 1/2 inch means 0.500 inch OD

Nominal size and actual outside diameter are different values.

❌ Confusing PVC pipe with PVC tubing

Pipe uses nominal IPS sizing; tubing is typically sized directly by OD.

❌ Confusing Schedule 40 with SDR

Different dimensioning systems under different ASTM standards.

❌ Mixing pressure pipe with DWV

Different applications, wall thicknesses, and fitting systems.

❌ Using steel schedule tables for PVC

PVC follows ASTM D1785, an entirely separate standard from ASME B36.10.

❌ Assuming same nominal size means same ID

ID varies significantly between Schedule 40, 80, and 120 at the same nominal size.

❌ Ignoring temperature

Pressure rating for PVC drops significantly above the reference temperature.

❌ Ignoring pressure rating

Size alone never determines pressure capability; check the product rating.

❌ Assuming PVC and CPVC are identical

Different materials, different standards, different temperature ratings.

❌ Selecting pipe based only on fitting size

Confirm the actual pipe schedule matches the fitting’s designed dimensions.

❌ Confusing OD and ID

Nominal size relates to OD, not the bore diameter available for flow.

❌ Using a generic chart without checking the product standard

Always confirm which ASTM standard governs the specific product before ordering.

Frequently Asked Questions

Common sizes range from 1/2 inch through 12 inch and larger, each with a standardized actual OD under ASTM D1785.

0.840 inches, the same across Schedule 40, 80 and 120.

Approximately 0.602 inches.

2.375 inches across Schedule 40, 80 and 120.

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

Varies by size, from about 0.109 inches at 1/2 inch to about 0.237 inches at 4 inch.

Varies by size, from about 0.147 inches at 1/2 inch to about 0.337 inches at 4 inch.

Based on a standardized outside diameter for each nominal size, with ID varying by schedule.

No, its actual OD is 0.840 inches.

Pipe uses nominal IPS sizing where actual OD differs from the label; tubing is sized directly by actual OD.

Schedule uses a standardized wall series; SDR maintains a constant OD to wall thickness ratio.

Schedule 40, 80 and 120 across a range of nominal sizes, though Schedule 120 has more limited availability.

They often share nominal sizes and OD, but are governed by separate standards with different ratings, so fittings and pressure ratings should not be assumed interchangeable.

Measure OD with a caliper or tape, compare against the standard table, and check any printed markings.

Determine flow, pressure, and temperature requirements, select a candidate ID, then confirm an available nominal size, schedule, and applicable code compliance.

📄 Download PVC Pipe Size Chart PDF

This PDF is a genuine field reference. Use the print button to create a print-ready or downloadable version.

PVC nominal sizes and ODSchedule 40 dimensionsSchedule 80 dimensionsSchedule 120 dimensionsInches and mmSchedule vs SDR explanationMeasurement guideCommon size quick referenceFitting size referenceASTM D1785 reference

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