Structural property table

Pipe Schedule Dimensions

Reference nominal pipe size, outside diameter, wall thickness, inside diameter, and weight for common Schedule 40 and Schedule 80 pipe sizes.

Schedule 40 Schedule 80 Notes

Schedule 40

Schedule 40 pipe dimensions

NPS	OD (in)	Wall (in)	ID (in)	Weight (lb/ft)	OD (mm)	Wall (mm)
1/8	0.405	0.068	0.269	0.245	10.3	1.7
1/4	0.540	0.088	0.364	0.424	13.7	2.2
3/8	0.675	0.091	0.493	0.568	17.1	2.3
1/2	0.840	0.109	0.622	0.851	21.3	2.8
3/4	1.050	0.113	0.824	1.131	26.7	2.9
1	1.315	0.133	1.049	1.679	33.4	3.4
1 1/4	1.660	0.140	1.380	2.273	42.2	3.6
1 1/2	1.900	0.145	1.610	2.718	48.3	3.7
2	2.375	0.154	2.067	3.653	60.3	3.9
2 1/2	2.875	0.203	2.469	5.793	73.0	5.2
3	3.500	0.216	3.068	7.576	88.9	5.5
4	4.500	0.237	4.026	10.790	114.3	6.0
6	6.625	0.280	6.065	18.974	168.3	7.1
8	8.625	0.322	7.981	28.554	219.1	8.2
10	10.750	0.365	10.020	40.483	273.1	9.3
12	12.750	0.406	11.938	53.520	323.9	10.3

Schedule 80

NPS	OD (in)	Wall (in)	ID (in)	Weight (lb/ft)	OD (mm)	Wall (mm)
1/8	0.405	0.095	0.215	0.315	10.3	2.4
1/4	0.540	0.119	0.302	0.535	13.7	3.0
3/8	0.675	0.126	0.423	0.738	17.1	3.2
1/2	0.840	0.147	0.546	1.088	21.3	3.7
3/4	1.050	0.154	0.742	1.474	26.7	3.9
1	1.315	0.179	0.957	2.172	33.4	4.5
1 1/4	1.660	0.191	1.278	2.997	42.2	4.9
1 1/2	1.900	0.200	1.500	3.631	48.3	5.1
2	2.375	0.218	1.939	5.022	60.3	5.5
2 1/2	2.875	0.276	2.323	7.661	73.0	7.0
3	3.500	0.300	2.900	10.250	88.9	7.6
4	4.500	0.337	3.826	14.976	114.3	8.6
6	6.625	0.432	5.761	28.573	168.3	11.0
8	8.625	0.500	7.625	43.390	219.1	12.7
10	10.750	0.594	9.562	64.420	273.1	15.1
12	12.750	0.688	11.374	88.630	323.9	17.5

Reference notes

NPS is a nominal designation. For most pipe sizes, it is not the same as the actual outside diameter.

The schedule primarily defines wall thickness. As wall thickness changes, inside diameter and weight also change.

Inside diameter is useful for flow checks, pressure drop estimates, and clearance calculations.

Verify final pipe selections against the applicable standard, pressure rating, material, corrosion allowance, and project specification.

US reinforcing bar numbers, diameters, cross-sectional areas, and nominal weights.