Nominal Pipe Size Chart for Piping Designers

Nominal Pipe Size Chart for Piping Designers

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Pipe size image
This handy chart offers a quick reference between imperial and metric pipe sizes.  This is a really handy chart for Piping Designers, and I have this printed out, cut down to size, and taped to my monitor.  That way I always have the sizes handy when I need them.  After some time you end up memorizing most of them, but there are always a few that you don't use often enough to commit to memory.  

Imperial N.P.S.Metric O.D.Metric N.P.S.
1/8"10.3mm10mm
1/4"13.7mm14mm
3/8"17.1mm17mm
1/2"21.3mm21mm
3/4"26.7mm27mm
1"33.4mm33mm
1-1/2"48.3mm48mm
2"60.3mm60mm
3"88.9mm89mm
4"114.3mm114mm
6"168.3mm168mm
8"219.1mm219mm
10"273.1mm273mm
12"323.9mm324mm
Imperial N.P.S.Metric O.D.Metric N.P.S.
14"355.6mm356mm
16"406.4mm406mm
18"457.0mm457mm
20"508.0mm508mm
22"559.0mm559mm
24"610.0mm610mm
26"660.0mm660mm
28"711.0mm711mm
30"762mm762mm
32"813.0mm813mm
34"864.0mm864mm
36"914.0mm914mm
42"1066.8mm1067mm
48"1219.2mm1219mm