Convert tank dimensions to liters and US gallons with a single click.
Why Use Our Aquarium Volume Calculator?
Whether you are setting up a new tank or performing routine maintenance, knowing your exact water volume is the most important step for successful fishkeeping. Our Aquarium Volume Calculator provides instant results in both US Gallons and Liters, helping you avoid common mistakes in the hobby.
Why Accurate Volume Matters
- Accurate Chemical Dosing: Avoid over-dosing water conditioners, fertilizers, or medications by knowing exactly how much water is in your tank.
- Filtration Planning: Ensure your filter’s GPH (Gallons Per Hour) rating is sufficient for your specific tank size.
- Stocking Limits: Properly estimate your stocking density to keep your fish healthy and prevent bio-load issues.
How It's Calculated
The calculator uses standard geometry to determine the internal volume of a rectangular glass or acrylic tank:
US Gallons: (Length × Width × Height) ÷ 231
Liters: (Length × Width × Height) ÷ 1000
Note: This calculator assumes internal dimensions. If you are measuring from the outside, subtract the thickness of the glass (usually 0.25–0.5 inches) for a more accurate result.