Free Tool
Pipe Volume Calculator
Enter a pipe's length and inside diameter to get the water volume it holds.
Water volume
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Uses inside diameter, not the pipe's nominal or outside size - a 3/4" nominal pipe's actual inside diameter varies by material (copper, PEX, PVC), so check the spec sheet for the exact figure if precision matters. Volume = pi x radius squared x length, converted to gallons at 231 cubic inches per gallon.
This math, built into every bid
Punchlist's reusable cost catalog keeps material quantities and pricing consistent across every plumbing job, not re-guessed each time.