Pipe Volume Calculator
Calculate the internal water volume, litres or gallons, fill time, cross-sectional area, water weight and filling cost of round pipe.
Default project preview
65.3 gallons
Cubic volume
0.247 m³
Fill time
6.5 min
Cross-sectional area
81.1 cm²
Water weight
544.8 lb
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Inside area = π × (diameter ÷ 2)². Volume = inside area × pipe length × quantity. Fill time = volume ÷ fill flow.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Pipe Volume Calculator questions
Should nominal or inside diameter be entered?+
Use the actual inside diameter because wall thickness changes capacity.
Why does pipe schedule affect volume?+
Different wall thicknesses produce different inside diameters for the same nominal pipe size.
Does this calculate flowing capacity?+
No. It calculates static internal volume. Flow capacity also depends on pressure, slope, friction and fittings.