Calculate the internal water volume held inside a pipe of a given diameter and length.
How to Use the Pipe Volume Calculator
Enter the pipe "Diameter (mm)".
Enter the pipe "Length (m)".
Click "Calculate" to see the internal water volume held inside the pipe.
Frequently Asked Questions
Volume = π × r² × Length, where r is the pipe's internal radius. This gives the internal water-holding volume of a straight pipe run.
It's useful for calculating how much water is needed to fill/flush a system, sizing expansion tanks, or estimating drain-down time and dead-leg volume in hot water systems.
No, it only calculates the volume of the straight pipe length entered. Fittings add a small additional volume not accounted for here.
Yes, it's completely free and requires no sign-up.