Pipeline Volume (Line Fill)
Estimates how much liquid a straight run of pipe holds from its inside diameter and length. Field crews use line fill to plan hydrostatic pressure testing, size transfer batches, and estimate pigging displacement before opening a valve.
Enter the pipe inside diameter and length below — the result updates as you type.
All results are an engineering estimate — not for custody transfer. Field measurement and certified tables govern.
How to calculate pipe volume
A straight, full pipe is a cylinder. Its internal volume is cross-sectional area multiplied by length: V = π × r² × L. With diameter in inches and length in feet, the radius in feet is the inside diameter divided by 24. The calculator converts that cubic-foot result into the output units shown above.
Worked example
For an illustrative pipe with a 6-inch inside diameter and a length of 100 feet, the radius is 0.25 feet. The internal volume is π × 0.25² × 100, or approximately 19.635 cubic feet before unit conversion. This is a hypothetical geometry example, not a terminal operating figure.
Use the inside diameter
Nominal pipe size and outside diameter are not the same as the clear opening. Wall thickness changes the inside diameter, and diameter is squared in the formula. Check the actual pipe specification before relying on an estimate.
What this estimate leaves out
This assumes a completely filled, straight, circular pipe. Fittings, valves, branches, deposits, trapped air, and changes in diameter need separate attention. It estimates geometric capacity; it does not prescribe a test pressure, a transfer procedure, or a safe operating limit.
Related tools and next steps
Convert volume units or explore the tank volume calculator. For an operating project, discuss terminal operations with our team.