Pipe Schedule Chart: A Comprehensive Guide to Pipe Sizes and Schedules

Quick answer: A pipe schedule is the wall-thickness series for a nominal pipe size (NPS) under ASME B36.10. For the same NPS, the outside diameter is fixed and a higher schedule means a thicker wall. Example: 2″ pipe has a 60.3 mm OD; SCH 40 wall is 3.91 mm (5.44 kg/m) and SCH 80 is 5.54 mm (7.48 kg/m).

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A pipe schedule chart is a table that lists the specifications for nominal pipe sizes and wall thicknesses in a piping system. The chart is used to determine the appropriate pipe size for a given fluid flow application, based on the desired flow rate, pressure drop, and other design parameters. The pipe schedule chart provides the following information for each size of pipe:

Black steel pipes stacked — Circular Hollow Section

Nominal Pipe Size (NPS)
Schedule Number
Outside Diameter (OD)
Wall Thickness (WT)
Inside Diameter (ID)
Pipe Weight per Foot (in kg)

Here is a sample pipe schedule chart for nominal pipe sizes ranging from 1/2 inch to 5 inches:

Nominal Pipe Size	Schedule	Outside Diameter	Wall Thickness	Inside Diameter	Weight per Foot (lb/ft)
1/2″	40	21.3 mm	3.73 mm	12.7 mm	0.47 kg
1/2″	80	21.3 mm	7.47 mm	6.35 mm	0.9 kg
3/4″	40	26.7 mm	3.91 mm	19.05 mm	0.68 kg
3/4″	80	26.7 mm	7.62 mm	12.7 mm	1.19 kg
1″	40	33.4 mm	4.55 mm	25.4 mm	0.85 kg
1″	80	33.4 mm	7.62 mm	19.05 mm	1.39 kg
1 1/4″	40	42.2 mm	4.85 mm	31.75 mm	1.16 kg
1 1/4″	80	42.2 mm	8.56 mm	25.4 mm	1.94 kg
1 1/2″	40	48.3 mm	5.08 mm	38.1 mm	1.39 kg
1 1/2″	80	48.3 mm	8.56 mm	31.75 mm	2.27 kg
2″	40	60.3 mm	5.54 mm	50.8 mm	1.83 kg
2″	80	60.3 mm	9.27 mm	44.45 mm	2.95 kg
2 1/2″	40	73 mm	6.35 mm	63.5 mm	2.45 kg
2 1/2″	80	73 mm	10.31 mm	56.27 mm	4.24 kg
3″	40	88.9 mm	7.11 mm	76.2 mm	3.13 kg
3″	80	88.9 mm	11.13 mm	68.26 mm	5.31 kg
4″	40	114.3 mm	7.87 mm	101.6 mm	4.18 kg
4″	80	114.3 mm	13.54 mm	88.9 mm	7.04 kg
5″	40	141.3 mm	9.53 mm	127 mm	5.58 kg
5″	80	141.3 mm	14.27 mm	114.3 mm	8.61 kg

Here is a sample pipe schedule chart for nominal pipe sizes ranging from 6 inches to 30 inches:

Nominal Pipe Size	Schedule	Outside Diameter	Wall Thickness	Inside Diameter	Weight per Foot (lb/ft)
6″	40	168.3 mm	10.97 mm	146.05 mm	7.48 kg
6″	80	168.3 mm	14.27 mm	133.35 mm	10.12 kg
8″	40	219.1 mm	11.13 mm	193.68 mm	10.31 kg
8″	80	219.1 mm	17.48 mm	177.8 mm	14.6 kg
10″	40	273.0 mm	11.4 mm	247.65 mm	13.63 kg
10″	80	273.0 mm	18.96 mm	228.6 mm	19.5 kg
12″	40	323.9 mm	12.7 mm	298.45 mm	17.79 kg
12″	80	323.9 mm	21.44 mm	279.4 mm	25.66 kg
14″	40	355.6 mm	12.7 mm	329.18 mm	19.72 kg
14″	80	355.6 mm	22.22 mm	300 mm	28.61 kg
16″	40	406.4 mm	14.27 mm	378.54 mm	24.67 kg
16″	80	406.4 mm	25.4 mm	350.49 mm	36.29 kg
18″	40	457.0 mm	15.09 mm	427.05 mm	29.09 kg
18″	80	457.0 mm	26.67 mm	400.05 mm	41.73 kg
20″	40	508.0 mm	15.09 mm	476.25 mm	33.51 kg
20″	80	508.0 mm	26.67 mm	450.85 mm	47.27 kg
24″	40	610.0 mm	16.66 mm	574.67 mm	42.67 kg
24″	80	610.0 mm	28.58 mm	550.55 mm	60.99 kg
30″	40	762.0 mm	19.05 mm	719.7 mm	59.97 kg
30″	80	762.0 mm	33.4 mm	679.45 mm	88.23 kg

Here is a sample pipe schedule chart for nominal pipe sizes ranging from 36 inches to 48 inches:

Nominal Pipe Size	Schedule	Outside Diameter	Wall Thickness	Inside Diameter	Weight per Foot (lb/ft)
36″	40	914.0 mm	22.22 mm	864.75 mm	79.26 kg
36″	80	914.0 mm	35.71 mm	817.75 mm	120.1 kg
42″	40	1067.0 mm	22.22 mm	1007.75 mm	96.94 kg
42″	80	1067.0 mm	35.71 mm	955.75 mm	145.9 kg
48″	40	1219.2 mm	23.83 mm	1152.54 mm	117.61 kg
48″	80	1219.2 mm	40.49 mm	1092.71 mm	179.19 kg

The schedule number in the chart refers to the wall thickness of the pipe, and it is expressed as a number. The higher the schedule number, the thicker the pipe wall. For example, a pipe with a schedule 80 designation has a thicker wall than a pipe with a schedule 40 designation. The schedule chart also lists the dimensions of the pipe, including the outside diameter and inside diameter, so that the correct fittings can be selected for the application. It’s important to note that the pipe schedule chart is based on the nominal pipe size, which is not the actual outside diameter of the pipe. The actual outside diameter can be slightly larger or smaller than the nominal size, depending on the manufacturing process and the tolerance allowed. You Can Read my Previous Post Welded Steel Pipe Weight Chart In Kg Download Pipe Schedule Chart (PDF)

Frequently asked questions

What does schedule 40 mean?

SCH 40 is a standard wall-thickness series in ASME B36.10; for sizes up to 10″ it equals STD (standard) wall.

Is SCH 80 thicker than SCH 40?

Yes. SCH 80 has a thicker wall and smaller bore for the same outside diameter, so it carries higher pressure.

How do I calculate pipe weight?

kg/m = 0.02466 × (OD − wall) × wall, in mm. Or use the pipe weight calculator.