About the Pipe Volume Calculator
Volume of water held in a length of pipe, with the weight and time to fill it.
Also known as: water in pipe, pipe capacity calculator, pipe litres per metre, pipe content volume.
How to use this calculator
- Enter inside diameter, pipe length, flow rate (optional).
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
V = π(d/2)² × length
Worked example
Using the values pre-filled in the calculator above:
- Inside diameter = 22 mm
- Pipe length = 20 m
- Flow rate (optional) = 12 L/min
the calculator returns:
- Water held: 7.603 litres
- Per metre: 0.3801 L/m
- Weight of water: 7.603 kg
- In US gallons: 2.0084