Pipe Volume Calculator
Free pipe volume calculator. Enter inner diameter and length to get the water volume in gallons per foot, total gallons, litres and water weight for any pipe.
Use the INNER diameter (not the nominal or outer size) for an accurate capacity — e.g. 4" Schedule 40 PVC has a 4.03" inner diameter.
About the Pipe Volume Calculator
Estimate the internal capacity of a cylindrical pipe from diameter and length. Enter the internal diameter for usable capacity rather than nominal outside size. Use the unit toggle to view the corresponding unit system.
Features
- Cylinder volume estimate
- Diameter and length inputs
- Unit-system toggle
How to use this tool
The Pipe Volume Calculator works right in your browser — no signup, no installation. Follow these steps:
- Enter the INNER diameter of the pipe in inches (e.g. 0.622 for 3/4" L copper).
- Enter the total pipe length in feet.
- Read the gallons per foot and the total volume.
- Use the water weight to check pump or support sizing.
Frequently asked questions
How does this tool work?
Estimate the internal capacity of a cylindrical pipe from diameter and length. Enter the internal diameter for usable capacity rather than nominal outside size. Use the unit toggle to view the corresponding unit system.
Using the results
The Pipe Volume Calculator estimates quantities from your measurements and the stated assumptions. Check dimensions, product coverage and project requirements before buying materials.