HowNotePipe Calculator
HowNote Tools · Unit Converter

Millimeter ↔ Inch Converter

Convert engineering dimensions in either direction using the exact international definition of one inch as 25.4 millimeters.

Use the converted dimension

For nominal pipe sizes, do not convert the NPS number itself into millimeters. Use the DN–NPS–A reference to find the nominal designation and actual OD.

Open DN–NPS–A ConverterOpen Pipe Weight Calculator