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Pipe Volume Calculator
Estimate pipe volume in gallons and liters.
How the pipe volume calculator works
Volume = π × r² × length. Convert length to inches, then divide the resulting cubic inches by 231 to get gallons.
Frequently asked questions
How many gallons in a 100 ft pipe?
A 1 in ID pipe × 100 ft holds ~4.1 gallons. A 2 in pipe × 100 ft holds ~16.3 gallons.
What's the difference between ID and OD?
Use inside diameter (ID) for volume — the wall thickness doesn't hold water.
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