Pipe Schedule Chart (Printable)

Actual outside diameter and Schedule 10 / 40 / 80 wall thickness for nominal pipe sizes 1/8″ through 2″ per ASME B36.10. Scoped to the small-bore instrument and process range — for larger pipe sizes, use a full B36.10 table.

NPS, OD and wall by schedule

NPS	Actual OD (in)	OD (mm)	Sch 10 wall (in)	Sch 40 wall (in)	Sch 80 wall (in)
1/8	0.405	10.29	0.049	0.068	0.095
1/4	0.540	13.72	0.065	0.088	0.119
3/8	0.675	17.15	0.065	0.091	0.126
1/2	0.840	21.34	0.083	0.109	0.147
3/4	1.050	26.67	0.083	0.113	0.154
1	1.315	33.40	0.109	0.133	0.179
1-1/4	1.660	42.16	0.109	0.140	0.191
1-1/2	1.900	48.26	0.109	0.145	0.200
2	2.375	60.33	0.109	0.154	0.218

How to use this chart

The NPS name is not a measurement: read the actual OD from this table, then pick the wall by schedule — Schedule 40 matches the STD wall and Schedule 80 matches XS in these sizes. Schedule changes the wall, not the OD. Dimensions are the published ASME B36.10 nominal values; the standard and the mill certificate govern for procurement.

From our guide: pipe vs tube — sizing, seals and how to order. Sending sizes for a quote? State NPS + schedule for pipe and OD × wall for tube.Request a factory quote.