🛢️ Tank Capacity Calculator for Plumbing
Calculate cylindrical tank capacity.
This free tool helps you turn project measurements into a practical planning estimate. Enter values in Vaelden’s interactive calculator, review the result, and confirm important assumptions against supplier data, measurements, codes or qualified advice before committing materials or money.
Open the Tank Capacity calculator →
How to calculate tank capacity
Method: Cylindrical tank capacity = π × radius² × usable height
- Measure internal tank diameter.
- Use usable water height between outlet dead space and overflow.
- Convert volume to litres and retain freeboard.
Worked example
Using these planning inputs:
- Tank diameter: 2.2
- Usable water height: 1.8
Tank capacity: 6842.39 L
Reality check: Manufacturer-rated capacity is preferable; tank foundation, overflow, mosquito protection and potable-water requirements need compliant detailing.
Before you calculate
Use consistent units and the best measured inputs available. Real materials, equipment, site conditions and tolerances can change the result. Vaelden shows planning estimates; regulated, structural, electrical, plumbing, pressure and other safety-critical work still requires appropriate local compliance and professional advice.