Nominal Pipe Size (NPS) to Diametre Nominal (DN)

Use this chart to compare the metric Diametre Nomial (DN) to the imperial standard of Nominal Pipe Size (NPS).

Diameter Nominal DN (mm)Nominal Pipe Size NPS (inches)
61/8
81/4
103/8
151/2
203/4
251.00
321.25
401.50
502.00
652.50
803.00
1004.00
1506.00
2008.00
25010.00
30012.00
35014.00
40016.00
45018.00
50020.00
55022.00
60024.00
65026.00
70028.00
75030.00
80032.00
90036.00
100040.00
105042.00
110044.00
120048.00
130052.00
140056.00
150060.00
160064.00
170068.00
180072.00
190076.00
200080.00
220088.00

*NPS to DN Comparison – Data is for informational purposes only. Stockton Valve Products accepts no responsibility for the accuracy or validity of this data