PEX, Copper & PVC Converter

Same name, different water. A 3/4 PEX line, a 3/4 Type M copper, and a 3/4 PVC all carry the outer header, but three different bores - and the bore is the only one that moves flow.

PEX, Copper & PVC Converter compares nominal sizes across materials by their true internal diameters, and tells you which nominal in another material carries the same water.

• Six materials: PEX-A/B, copper M/L, PVC 40, CPVC.
• Bore-first: Comparisons on true internal IDs.
• Drop-in match: The right nominal on the new side.
• Full table: Every size compared side by side.
• mm and in: Both unit systems shown.
• Export: Text, CSV or JSON report.

1. Pick the source material and its nominal size.
2. Pick the target material.
3. Read the match: the smallest target bore at least as big.
4. Review the table for context.
5. Export the comparison if you want it.

Example 1. 3/4 in Type L copper has a 0.785 in bore. PEX-A 3/4 carries only 0.671 in, so the drop-in that holds the flow is 1 in PEX-A (0.873 in bore).

Example 2. 1 in PVC 40 (1.049 in bore) roughly matches 1 in copper M (1.055 in bore) - essentially even.

Example 3. Replacing 1/2 in copper L (0.545 in) with PVC: 1/2 in PVC (0.622 in) is already larger - a clean swap.

• Stops name confusion: Compares what carries water.
• Drop-in answer: No chart digging.
• All the common tubes: Six materials in one screen.
• Dual units: Inches and mm together.
• Free and private: No uploads, no logging.