Imperial to Metric Conversion Table for PVC Pipe Sizes Size table for Schedule 40 & 80 pipe only.
NPS Size DN Size Imperial OD Metric OD
1/2 in. 15 0.840 in. 21.34mm
3/4 in. 20 1.050 in. 26.67mm
1in. 25 1.315 in. 33.40mm
1-1/4 in. 32 1.660 in. 42.16mm
1-1/2 in. 40 1.900 in. 48.26mm
2 in. 50 2.375 in. 60.33mm