Pipe Volume Calculator
Estimate pipe volume in gallons and liters.
Use this pipe volume calculator to estimate how much liquid a pipe holds in gallons and liters. Enter the pipe’s inside diameter (ID) and length to calculate its capacity. The calculation uses the cylinder volume formula and converts the result from cubic inches to gallons.
Volume
2.04
gallons
Volume
7.72
liters
Volume
471
in³
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How does the pipe volume calculator work?
Volume = π × r² × length. Convert length to inches, then divide the resulting cubic inches by 231 to get gallons.
What else do people ask about this calculator?
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.
Which related calculators should I use next?
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