basic

Pipe Wall Thickness from Pressure and Material Calculator

Barlow: t = P·D / (2·S·E − P·Y).

Calculates minimum pipe wall thickness using the ASME Barlow / B31 formula from design pressure, pipe outer diameter, allowable stress, weld efficiency, and temperature coefficient.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t_min = P × D / (2 × S × E − P × Y); with safety margin

In depth

Calculates minimum pipe wall thickness using the ASME Barlow / B31 formula from design pressure, pipe outer diameter, allowable stress, weld efficiency, and temperature coefficient.