Aquarium Volume Calculator
Calculate aquarium water volume in gallons or liters from tank dimensions.
Supports rectangular, cylindrical, and bow-front shapes.
Tank Volume
Aquarium volume depends on the shape of the tank.
Rectangular tank:
Volume = Length × Width × Height
Cylindrical tank:
Volume = π × Radius² × Height
Imperial conversion: 1 cubic inch = 0.004329 US gallons Metric conversion: 1 cubic centimeter = 0.001 liters
Common stocking guideline:
- Freshwater: roughly 1 inch of fish per gallon (2.5 cm per 4 liters)
- Saltwater: roughly 1 inch of fish per 5 gallons (2.5 cm per 20 liters)
Note: Decorations, substrate, and equipment reduce actual water volume by roughly 10–15%.