Tank Gallon Calculator
Calculate the volume of a tank in gallons based on its shape and dimensions. Supports rectangular, cylindrical, and spherical tanks.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator estimates the volume of a tank in US gallons based on its shape and dimensions. All measurements must be entered in inches.
- Select Tank Shape – Choose Rectangular, Cylindrical, or Spherical from the dropdown.
- Enter Dimensions – Input the required values in inches:
- Rectangular: Length, Width, Height
- Cylindrical: Diameter, Height
- Spherical: Diameter
- Click “Calculate Gallons” – The result shows the volume in gallons along with the formula used.
Note: All values must be positive numbers. The conversion uses 1 US gallon = 231 cubic inches.
Previous Results
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Frequently Asked Questions
Multiply length, width, and height in inches to get cubic inches, then divide by 231 (cubic inches per gallon).
Volume = π × (diameter/2)² × height in inches, then divide by 231.
Yes, it calculates spherical tank volume using (4/3) × π × (diameter/2)³ and converts to gallons.
