Pipe Volume Calculator
Enter inner diameter and pipe length to get internal volume in liters, US gallons, and cubic feet.
Pipe Dimensions
Common nominal pipe inner diameters
½″ NPS → 0.622″¾″ NPS → 0.824″
1″ NPS → 1.049″1¼″ NPS → 1.380″
1½″ NPS → 1.610″2″ NPS → 2.067″
3″ NPS → 3.068″4″ NPS → 4.026″
6″ NPS → 6.065″8″ NPS → 7.981″
Enter diameter and length, then click Calculate.
Volume Results
Liters
—
L
US Gallons
—
gal
Cubic Feet
—
ft³
| Unit | Volume |
|---|---|
| Cubic inches | — |
| Cubic centimeters | — |
| Cubic meters | — |
| Imperial gallons | — |
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Summary
Enter inner diameter and pipe length to get internal volume in liters, US gallons, and cubic feet.
How it works
- Enter the pipe inner diameter and pipe length.
- Select units for each measurement (inches, feet, millimeters, or meters).
- The calculator applies V = π × (d/2)² × L to get volume in cubic inches or cubic millimeters.
- Results are converted to liters, US gallons, and cubic feet.
Use cases
- Estimate water volume needed to fill or flush a piping system.
- Size water heaters or pressure tanks for residential plumbing.
- Calculate fluid inventory in industrial pipe runs.
- Plan chemical dosing volumes for treatment systems.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu