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Pipe Schedule Lookup

Look up outside diameter, wall thickness, internal bore, flow area and pressure rating for steel and PVC pipe in schedules 40 and 80, from 1/2 to 4 inch.

Selection
The outside diameter stays fixed per size; the schedule decides how much wall is left for the bore.
Result
—
internal bore
—
pressure rating
Notes

About Pipe Schedule Lookup

Every nominal pipe size hides three different numbers behind one label - the outside diameter, the wall, and the bore left for water. The schedule decides the last two, and with them the rating.

Pipe Schedule Lookup pulls the standard dimensions of steel and PVC pipe in schedules 40 and 80, and works out the bore, area and pressure rating for you.

Features

  • NPS range: 1/2 through 4 inch.
  • Two schedules: 40 and 80.
  • Two materials: Steel and PVC.
  • Dimensions: OD, wall, ID, flow area.
  • Rating: Pressure rating shown for both.
  • Export: Text, CSV or JSON report.

How to Use

  1. Pick the material - steel or plastic.
  2. Pick the nominal size (NPS).
  3. Pick the schedule - 40 or 80.
  4. Read the bore and rating for the flow work.
  5. Export the report when needed.

Examples

Example 1. 2 in schedule 40 steel: 2.067 in bore, ~0.154 in wall, bursts far above daytime service.

Example 2. 1 in PVC schedule 40 rated about 450 psi - plenty for supply, fine for most drains.

Example 3. Stepping 2 in from schedule 40 to 80 drops the bore from 2.067 to 1.939 in but lifts the rating.

Benefits

  • Cuts chart hunting: Dimensions at a tap.
  • Corrects bores: Feeds flow and volume tools.
  • Both materials: Steel and PVC side by side.
  • Rating included: Pressure answers included.
  • Free and private: No uploads, no logging.

Frequently Asked Questions

What does a schedule number mean?
It is a rough wall-thickness series. Higher schedules have thicker walls for the same nominal size, so the outside diameter stays constant while the bore shrinks and the pressure rating grows.
Use outside or inside diameter?
Inside - the bore carries the flow. This lookup shows the internal diameter that the schedule leaves you, which is the number flow and volume tools need.
Does schedule change the OD?
No. Each nominal size has a fixed outside diameter across schedules; the wall gets thicker and the interior smaller as the schedule climbs.
What is schedule 40 vs 80?
Schedule 40 is the everyday service line; schedule 80 has roughly twice the wall in some sizes, a smaller bore, and a higher pressure rating. Choose on the pressure you must hold, not the name.
Are PVC and steel dimensions the same?
The outside diameters align across the nominal range, and PVC schedule walls track the steel series closely. Ratings differ sharply because the materials do.
How is pressure rating set?
Steel uses the Barlow hoop-stress formula with an accepted design stress; PVC uses ASTM hydrostatic ratings with a safety factor. Both grow with a thicker wall and shrink with a bigger bore.
Is my data stored?
No. Everything runs in your browser; nothing is uploaded, saved or logged.

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