Overhead Tank Volume Calculator
Calculate the capacity of your overhead water tank in liters or gallons
Calculation Results
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Frequently Asked Questions
Our calculator provides highly accurate results based on standard geometric formulas. For rectangular tanks, it uses length × width × height, and for cylindrical tanks, it uses π × radius² × height. The results are precise for standard tank shapes, but actual capacity may vary slightly due to manufacturing variations.
Liters and gallons are both units of volume measurement. 1 US gallon equals approximately 3.785 liters. Our calculator automatically converts between these units, with the US gallon (not imperial gallon) as the standard for the gallons option.
For rectangular tanks: measure the interior length, width, and height from the bottom to the overflow level. For cylindrical tanks: measure the interior diameter (distance across the circular base) and height. Always measure in a straight line, not following the curves of the tank.
Knowing your tank’s volume helps with: proper water treatment dosing, understanding water usage patterns, planning for emergency storage needs, sizing replacement tanks, and ensuring your water pump has adequate capacity to fill the tank efficiently.
Yes, the same volume calculations apply regardless of tank orientation (vertical/horizontal) or placement (overhead/underground). However, for horizontal cylindrical tanks, the actual water volume at different fill levels requires more complex calculations.