HowNote Tools · Pipe / Tube

DN ↔ NPS ↔ A Pipe Size Converter

Choose any nominal designation and see the matching DN, NPS and regional A label. Actual outside diameter remains a separate value.

Choose by DN

Choose by A designation

Choose by NPS

This first public dataset intentionally uses the same six cross-checked Schedule 40 references as the Pipe Weight Calculator.

Cross-reference result

—

DN—

A designation—

NPS—

Actual OD—

Reference series—

Reference standard—

Nominal does not mean measured.

For example, DN 50 / 50A / NPS 2 has an actual OD of 60.3 mm in this reference set.

Calculate this pipe

Current nominal-size reference

DN	A	NPS	Actual OD mm	Reference
DN 50	50A	NPS 2	60.3	Schedule 40	Calculate →
DN 65	65A	NPS 2 1/2	73	Schedule 40	Calculate →
DN 80	80A	NPS 3	88.9	Schedule 40	Calculate →
DN 100	100A	NPS 4	114.3	Schedule 40	Calculate →
DN 150	150A	NPS 6	168.3	Schedule 40	Calculate →
DN 200	200A	NPS 8	219.1	Schedule 40	Calculate →

The A labels are regional convenience aliases and are not presented as ASME terminology. Ordering still requires the governing standard, edition, schedule or wall, material and purchase conditions.