Pipe Volume Calculator
Enter inner diameter and pipe length to get internal volume in liters, US gallons, and cubic feet.
Use the Pipe Volume Calculator
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: 2026-09-20 ·
Reviewed by Nham Vu