NPS to DN & OD Pipe Size Converter
NPS to DN & OD Converter is a steel pipe size conversion tool that converts NPS (inch) into DN and Outside Diameter (OD mm) based on ASME B36.10M/B36.19M pipe dimension standards. Since NPS is a nominal size and does not equal the actual pipe diameter, this calculator uses standard pipe size data with different Schedule (SCH) classifications to provide accurate OD references.
The Schedule number defines pipe wall thickness and pressure capability, while the outside diameter remains fixed for each NPS size.
Pipe Schedule Calculator
Convert NPS pipe size to DN and Outside Diameter (OD).
For example, an NPS 8 pipe always has an outside diameter of 219.1 mm, whether it is SCH 10, SCH 40, or SCH 80. The difference between schedules is the wall thickness and pressure rating.
This NPS conversion calculator helps users quickly identify standard pipe dimensions for carbon steel pipe, stainless steel pipe, seamless pipe, ERW pipe, and industrial piping systems.
