Sch 80 Pipe Dimensions Chart

Schedule 80 Pipe Dimensions Chart: Sizes, Thickness, Weight

Schedule 80 pipe dimensions are standardized by ASME B36.10M for carbon and alloy steel pipes and ASME B36.19M for stainless steel pipes. These standards define the relationship between Nominal Pipe Size (NPS), Outside Diameter (OD), Wall Thickness (WT), Inside Diameter (ID), and Pipe Weight, ensuring that pipes from different manufacturers remain interchangeable.

Unlike nominal pipe size, Schedule 80 (SCH 80) refers to a standardized wall thickness series rather than a specific pipe size. Pipes with the same NPS always share the same outside diameter, while the wall thickness, inside diameter, weight, and pressure capacity vary according to the schedule designation.

This guide focuses on the complete Sch 80 Pipe Dimensions Chart, including standard dimensions, wall thickness, weight, and size conversions to help engineers, buyers, contractors, and project managers quickly select the correct pipe dimensions for industrial applications.

What Is Schedule 80 Pipe?

Schedule 80 is a standardized pipe wall thickness designation, not a material grade or pressure rating. It specifies the wall thickness for each Nominal Pipe Size (NPS), while the outside diameter remains unchanged.
For example, both a 2-inch Schedule 40 pipe and a 2-inch Schedule 80 pipe have an outside diameter of 60.3 mm (2.375 in.). However, the Schedule 80 pipe has a thicker wall, resulting in a smaller inside diameter and a higher unit weight.

Pipe Size	Outside Diameter	SCH 40 WT	SCH 80 WT
2 in	60.3 mm	3.91 mm	5.54 mm
4 in	114.3 mm	6.02 mm	8.56 mm
6 in	168.3 mm	7.11 mm	10.97 mm

Schedule 80 Pipe Standards

Schedule 80 pipe dimensions are standardized internationally to ensure interchangeability, consistent quality, and reliable engineering calculations.
The applicable standards depend on the pipe material.

Standard	Scope
ASME B36.10M	Carbon Steel & Alloy Steel Pipe Dimensions
ASME B36.19M	Stainless Steel Pipe Dimensions
ASTM A53	Welded & Seamless Carbon Steel Pipe
ASTM A106	Seamless Carbon Steel Pipe for High Temperature Service
API 5L	Line Pipe for Oil & Gas Transportation
ASTM A333	Low-Temperature Carbon Steel Pipe
ASTM A335	Alloy Steel Pipe for High Temperature Applications
ASTM A312	Stainless Steel Seamless & Welded Pipe

How Schedule 80 Pipe Dimensions Are Defined

When selecting Schedule 80 steel pipe, engineers normally consider five key dimensions:
1. Outside Diameter (OD)
The outside diameter is fixed by the nominal pipe size.
For example:
A 4 inch Schedule 80 pipe has:
OD: 4.500 inches
OD: 114.3 mm
The OD remains the same whether the pipe is Schedule 40, Schedule 80, or Schedule 160.
2. Wall Thickness
Wall thickness is the main difference between different schedules.
A thicker wall means:
Higher pressure resistance
Greater weight
Higher material cost
Smaller internal flow area
Example:
A 4 inch Schedule 80 pipe:
Wall thickness: 8.56 mm
A 4 inch Schedule 40 pipe:
Wall thickness: 6.02 mm

3. Inside Diameter (ID)
Inside diameter determines fluid flow capacity.
Because Schedule 80 pipe has a thicker wall, its ID is smaller than Schedule 40 pipe with the same NPS size.

Pipe Size	OD	Wall Thickness	Approx. ID
2 inch Sch 80	60.3 mm	5.54 mm	49.2 mm
4 inch Sch 80	114.3 mm	8.56 mm	97.2 mm
6 inch Sch 80	168.3 mm	10.97 mm	146.4 mm

Schedule 80 Pipe Dimensions Chart

The following chart shows common Schedule 80 steel pipe dimensions based on ASME B36.10M.

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.095	2.41	0.31	0.47
1/4	0.54	13.7	0.119	3.02	0.54	0.8
1/2	0.84	21.3	0.147	3.73	1.09	1.62
3/4	1.05	26.7	0.154	3.91	1.47	2.2
1	1.315	33.4	0.179	4.55	2.17	3.24
1 1/4	1.66	42.2	0.191	4.85	3	4.47
1 1/2	1.9	48.3	0.2	5.08	3.63	5.41
2	2.375	60.3	0.218	5.54	5.02	7.48
2 1/2	2.875	73	0.276	7.01	7.66	11.41
3	3.5	88.9	0.3	7.62	10.25	15.27
3 1/2	4	101.6	0.318	8.08	12.5	18.63
4	4.5	114.3	0.337	8.56	14.98	22.32
5	5.563	141.3	0.375	9.53	20.78	30.97
6	6.625	168.3	0.432	10.97	28.57	42.56
8	8.625	219.1	0.5	12.7	43.39	64.64
10	10.75	273	0.594	15.09	64.43	96.01
12	12.75	323.8	0.688	17.48	88.63	132.08
14	14	355.6	0.75	19.05	106.13	158.1
16	16	406.4	0.844	21.44	136.61	203.53
18	18	457	0.938	23.83	170.92	254.55
20	20	508	1.031	26.19	208.87	311.17
24	24	610	1.125	30.96	296.58	442.08

Schedule 80 Pipe Weight & Weight Calculation

The weight of Schedule 80 pipe is an important factor in engineering design, transportation planning, installation, and cost estimation. Because SCH 80 pipe has a thicker wall than lighter schedules such as SCH 40, it contains more steel material and therefore has a higher weight per unit length.
The actual weight of a Schedule 80 pipe depends on several factors:
Nominal Pipe Size (NPS)
Outside Diameter (OD)
Wall Thickness
Pipe Material Density
Pipe Length
For the same pipe size, SCH 80 pipe is heavier than SCH 40 because of its increased wall thickness.
For example:

Pipe Size	SCH 40 Weight	SCH 80 Weight
2 inch pipe	Lower	Higher
4 inch pipe	Lower	Higher
6 inch pipe	Lower	Higher

Sch 80 Pipe Weight Chart

Theoretical pipe weight is widely used for estimating transportation costs, structural loading, material purchasing, and project budgeting.
Because Schedule 80 pipe has a thicker wall than Schedule 40, it contains more steel per meter and therefore weighs more.
The theoretical weight of steel pipe can be calculated using:
Weight (kg/m) = (OD − WT) × WT × 0.02466
Where:
OD = Outside Diameter (mm)
WT = Wall Thickness (mm)
The table below lists the theoretical weight of common Schedule 80 steel pipes in both kilograms per meter (kg/m) and pounds per foot (lb/ft).

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8" NPS6	0.41	10.3	0.095	2.41	0.31	0.47
1/4" NPS8	0.54	13.7	0.119	3.02	0.54	0.8
3/8" NPS10	0.68	17.1	0.126	3.2	0.74	1.1
1/2" NPS15	0.84	21.3	0.147	3.73	1.09	1.62
3/4" NPS20	1.05	26.7	0.154	3.91	1.47	2.2
1" NPS25	1.32	33.4	0.179	4.55	2.17	3.24
1 1/4" NPS32	1.66	42.2	0.191	4.85	3	4.47
1 1/2" NPS40	1.9	48.3	0.2	5.08	3.63	5.41
2" NPS50	2.375	60.3	0.218	5.54	5.02	7.48
2 1/2" NPS65	2.875	73	0.276	7.01	7.66	11.41
3" NPS80	3.5	88.9	0.3	7.62	10.25	15.27
3 1/2" NPS90	4	101.6	0.318	8.08	12.5	18.63
4" NPS100	4.5	114.3	0.337	8.56	14.98	22.32
5" NPS125	5.563	141.3	0.375	9.53	20.78	30.97
6" NPS150	6.625	168.3	0.432	10.97	28.57	42.56
8" NPS200	8.625	219.1	0.5	12.7	43.39	64.64
10" NPS250	10.75	273	0.594	15.09	64.43	96.01
12" NPS300	12.75	323.8	0.688	17.48	88.63	132.08
14" NPS350	14	355.6	0.75	19.05	106.13	158.1
16" NPS400	16	406.4	0.844	21.44	136.61	203.53
18" NPS450	18	457	0.938	23.83	170.92	254.55
20" NPS500	20	508	1.031	26.19	208.87	311.17
24" NPS600	24	610	1.125	30.96	296.58	442.08

How to Calculate Schedule 80 Pipe Weight?

The theoretical weight of carbon steel pipe can be calculated using the following formula:
Weight (kg/m) = (OD - WT) × WT × 0.02466
Where:
OD = Outside Diameter (mm)
WT = Wall Thickness (mm)
0.02466 = Constant for carbon steel density
Example:
For a 2 inch Schedule 80 carbon steel pipe:
OD = 60.3 mm
Wall thickness = 5.54 mm
Weight calculation:
(60.3 - 5.54) × 5.54 × 0.02466
≈ 7.48 kg/m
This calculated value matches the standard ASME B36.10M dimensional data.

For stainless steel and alloy steel pipes, the actual weight may vary slightly because of different material densities.

NPS, DN and NB Conversion Chart

Pipe sizes are often expressed using different designation systems depending on the region or industry. Understanding the relationship between NPS, DN, and NB helps engineers avoid ordering errors and interpret international specifications correctly.
NPS (Nominal Pipe Size) is the sizing system used primarily in North America.
DN (Diameter Nominal) is the international metric designation defined by ISO standards.
NB (Nominal Bore) is commonly used in countries following British or Commonwealth engineering practices.
Although these designations use different naming conventions, they generally refer to the same nominal pipe size.

Nominal Bore (metric / NB / DN)	Nominal Bore (Imperial)	Pipe Outside Diameter (metric)
10mm	3/8″	17.2 mm
15mm	1/2″	21.3mm
20mm	3/4″	26.9mm
25mm	1″	33.7mm
32mm	1 1/4″	42.4mm
40mm	1 1/2″	48.3mm
50mm	1 2″	60.3mm
65mm	2 1/2″	76.1mm
80mm	3″	88.9mm
100mm	4″	114.3mm
125mm	5″	139.7mm
150mm	6″	168.3mm
175mm	7″	193.7mm
200mm	8″	219.1mm
225mm	9″	244.5mm
250mm	10″	273.0mm
300mm	12″	323.9mm
350mm	14″	355.6mm
400mm	16″	406.4mm
450mm	18″	457.0mm
500mm	20″	508.0mm
550mm	22″	559.0mm
600mm	24″	610.0mm

Sch 40 vs Sch 80 Dimensions

Schedule 40 and Schedule 80 pipes share the same outside diameter for each nominal size. The primary dimensional differences are wall thickness, inside diameter, and theoretical weight.
As wall thickness increases, the inside diameter becomes smaller while the pipe weight increases. This is why engineers should verify wall thickness instead of relying solely on nominal pipe size when selecting piping components.

Feature	Schedule 40	Schedule 80
Outside Diameter	Same	Same
Wall Thickness	Thinner	Thicker
Inside Diameter	Larger	Smaller
Weight	Lighter	Heavier

For example, a 2-inch Schedule 40 pipe and a 2-inch Schedule 80 pipe both have an outside diameter of 60.3 mm, but the Schedule 80 pipe has a thicker wall, resulting in a smaller inside diameter and greater weight.

FAQ

1. What is Schedule 80 pipe?
Schedule 80 pipe is a heavy-wall pipe classification with thicker walls than Schedule 40 pipe, providing higher pressure resistance and mechanical strength.
2. Is Schedule 80 pipe stronger than Schedule 40?
Yes. Schedule 80 pipe has a thicker wall, higher weight, and generally higher pressure capability than Schedule 40 pipe of the same size.
3. What is the wall thickness of Schedule 80 pipe?
The wall thickness depends on pipe size.
For example:
2 inch Schedule 80 pipe: 5.54 mm
4 inch Schedule 80 pipe: 8.56 mm

4. What sizes are available for Schedule 80 pipe?
Schedule 80 pipes are available from small sizes such as 1/8 inch to large industrial sizes above 24 inches.
5. What is the difference between Sch 80 and Sch 160 pipe?
Schedule 160 pipe has an even thicker wall than Schedule 80 and is used for more extreme pressure applications.
6. Can Schedule 80 pipe be used for high-temperature applications?
Yes, especially when manufactured from suitable materials such as ASTM A106 Grade B.
7. Is Schedule 80 pipe suitable for oil and gas applications?
Yes. API 5L and ASTM-grade Schedule 80 pipes are commonly used in demanding oil and gas applications.