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Pipe volume calculator

Know the capacity
inside the pipe.

Calculate the volume held by a full, circular pipe from its inside diameter and length. Use measured dimensions or start from a documented size reference.

Results include US gallons, litres, cubic feet and cubic metres, plus fluid mass at the density you enter.

A free standalone tool: no account, no sign-up, and nothing you enter leaves your browser. It works the same whether or not you use OrdexisOne, and it is not part of any paid plan.

Set the actual dimensions.

The loaded values are an example. Changing units converts the entered diameter and length.

Use the internal bore, not the outside diameter or nominal size. The pipe is assumed to have this same unobstructed diameter along its full length.

Illustrative inside diameter. Replace it with the dimension for your pipe.

Fluid mass

The example 1,000 kg/m³ is a rounded water-density assumption. Use your fluid’s density at its operating temperature. Mass excludes the pipe and fittings.

Full-bore capacity

The same volume. Your preferred units.

Calculated from the example dimensions.

US liquid gallons
—US gal
Litres
—L
Cubic feet
— ft³
Cubic metres
— m³

Fluid mass at your density

— kg / — lb

Mass changes with fluid density. The calculated capacity depends only on the entered dimensions.

Method & scope

A full cylinder, measured from the inside.

Volume = π × (inside diameter ÷ 2)² × length, using consistent length units. Fluid mass = volume in cubic metres × density in kg/m³.

One US liquid gallon is 231 cubic inches, or 3.785411784 litres. One foot is 0.3048 metres and one inch is 25.4 mm. The results use US liquid gallons. NIST publishes the unit-conversion reference.

This calculation excludes fittings, valves, branches, equipment volumes and partial filling. It does not determine flow rate, pressure loss or a material’s suitability for a service.

Where the reference diameters come from

PVC Schedule 40 & 80

Reference bore is average outside diameter minus twice the listed minimum wall. Actual bore can differ.

Charlotte Pipe dimensional catalog · pages 4 and 27 (PDF)

Copper Types K, L & M

Listed inside diameters or outside diameter minus twice the listed wall, for the selected tube type.

Elkhart engineering data · printed page 40 (PDF, hosted by Ferguson)

Steel Schedule 40

Selected 1–8 inch nominal sizes from the listed inside diameters. This is a dimensional reference, not a pressure or application rating.

Wheatland Schedule 40 submittal · page 2 (PDF)

Keep the job connected beyond the calculation.

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