Pipe Size Reference Tables

Dimensions for common plumbing pipe materials. All measurements in inches.

Nominal	Type	OD	ID	Wall
1/2"	K	0.625	0.527	0.049
	L	0.625	0.545	0.040
	M	0.625	0.569	0.028
3/4"	K	0.875	0.745	0.065
	L	0.875	0.785	0.045
	M	0.875	0.811	0.032
1"	K	1.125	0.995	0.065
	L	1.125	1.025	0.050
	M	1.125	1.055	0.035
1-1/4"	K	1.375	1.245	0.065
	L	1.375	1.265	0.055
	M	1.375	1.291	0.042
1-1/2"	K	1.625	1.481	0.072
	L	1.625	1.505	0.060
	M	1.625	1.527	0.049
2"	K	2.125	1.959	0.083
	L	2.125	1.985	0.070
	M	2.125	2.009	0.058

Type K: Thickest wall, underground/high pressure. Type L: Standard for interior water. Type M: Thinnest, drain/low pressure.

Nominal	OD	ID	Wall
3/8"	0.500	0.360	0.070
1/2"	0.625	0.475	0.075
5/8"	0.750	0.574	0.088
3/4"	0.875	0.671	0.102
1"	1.125	0.862	0.131

PEX uses copper tube size (CTS) outside diameter. Wall thickness varies by SDR rating. Values shown are typical SDR 9.

Nominal	Type	OD	ID	Wall
1/2"	CTS	0.625	0.485	0.070
1/2"	Sch 40	0.840	0.622	0.109
3/4"	CTS	0.875	0.729	0.073
3/4"	Sch 40	1.050	0.824	0.113
1"	CTS	1.125	0.949	0.088
1"	Sch 40	1.315	1.049	0.133

CTS: Copper tube size, uses copper fittings. Sch 40: Iron pipe size, uses threaded or solvent weld fittings.

Nominal	Schedule	OD	ID	Wall
1/2"	40	0.840	0.622	0.109
1/2"	80	0.840	0.546	0.147
3/4"	40	1.050	0.824	0.113
3/4"	80	1.050	0.742	0.154
1"	40	1.315	1.049	0.133
1"	80	1.315	0.957	0.179
1-1/2"	40	1.900	1.610	0.145
1-1/2"	80	1.900	1.500	0.200
2"	40	2.375	2.067	0.154
2"	80	2.375	1.939	0.218
3"	40	3.500	3.068	0.216
3"	80	3.500	2.900	0.300
4"	40	4.500	4.026	0.237
4"	80	4.500	3.826	0.337

Nominal	OD	ID	Wall
1/2"	0.840	0.622	0.109
3/4"	1.050	0.824	0.113
1"	1.315	1.049	0.133
1-1/4"	1.660	1.380	0.140
1-1/2"	1.900	1.610	0.145
2"	2.375	2.067	0.154
2-1/2"	2.875	2.469	0.203
3"	3.500	3.068	0.216
4"	4.500	4.026	0.237