Pipe Volume Calculator
Calculate the volume of liquid a pipe can hold. Free online pipe volume calculator using inner diameter and length.
Volume = π × r² × L
π × (0.0508 m)² × 3.048 m = 0.02471 m³
24.71 L
Pipe Volume
Cubic Meters
0.0247 m³
Gallons
6.53 gal
Cubic Feet
0.8727 ft³
Inner Diameter
4 in
Pipe Length
10 ft
Radius
0.0508 m
How Does the Pipe Volume Calculator Work?
Enter the inner diameter and length of the pipe. The calculator converts the units to meters, finds the radius, and applies the cylinder volume formula Volume = π × r² × L. The result is shown in liters, cubic meters, gallons US, and cubic feet. Use the inner diameter rather than the outer diameter to measure liquid capacity correctly.
Example
For a pipe with a 4-inch inner diameter (0.1016 m) and 10 ft length (3.048 m): the radius is 0.0508 m. Volume = π × 0.0508² × 3.048 = 0.0247 m³, which equals 24.72 liters, 6.53 US gallons, or 0.873 ft³.
Common Use Cases
- Estimating water volume in plumbing and piping systems.
- Sizing storage tanks and pressure vessels.
- Calculating coolant volume for heating and cooling loops.
- Planning pre-fill or flushing quantities for pipeline installations.
FAQs
Should I use the inner or outer diameter?
Always use the inner diameter (the bore) for volume calculations, because liquid only occupies the hollow interior. The outer diameter includes the pipe wall thickness.
Do the gallon results use US or imperial gallons?
The calculator uses US gallons (1 US gallon ≈ 3.785 liters). Imperial gallons are about 20% larger.
What if my pipe is given in metric units?
Enter the diameter in millimeters and the length in meters using the unit selectors — the calculator handles the conversion automatically.