Pipe Size Converter

How to use

1. Enter your value in the box above or select an option.
2. The result updates live right away — no button needed.
3. Change the value or unit and the new result shows automatically.

Note

NPS (Nominal Pipe Size) is a name, not the actual diameter — for example, an NPS 1/2 pipe has an outside diameter of 21.3 mm, not 12.7 mm. DN (Diameter Nominal) is the metric name for the same size.