Water Tank Volume — 8 ft Diameter, 12 ft Tall
An 8 ft diameter, 12 ft tall tank holds about 4,521 US gallons, suitable for large residential or farm use.
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How to use this tool
- Enter the tank's inside diameter and height in feet.
- The calculator returns volume in cubic feet, US gallons, and litres.
- For rectangular tanks, use length × width × height in ft³ and multiply by 7.48 for gallons.
Determine the gallon capacity of an 8-foot round water storage tank for farm or fire-suppression use.
Frequently asked questions
- How do I calculate water tank volume?
- For a cylindrical tank, use: Volume = π × (diameter/2)² × height. Multiply cubic feet by 7.48 for US gallons or by 28.32 for litres.
- How many gallons is a cubic foot?
- One cubic foot of water holds approximately 7.48 US gallons or 28.32 litres.