Aquarium Volume Calculator
Calculate the water volume of your aquarium from its dimensions.
Supports gallons and liters, imperial and metric measurements.
Aquarium Volume
Aquarium Volume is calculated from the tank dimensions:
Imperial (inches → gallons):
Volume (gallons) = Length × Width × Height (all in inches) / 231
Metric (cm → liters):
Volume (liters) = Length × Width × Height (all in cm) / 1,000
Conversions:
- 1 US gallon = 3.785 liters
- 1 liter = 0.264 US gallons
- 1 cubic inch = 0.004329 gallons
Stocking guidelines (general rule):
- Freshwater: 1 inch of fish per gallon
- Saltwater: 1 inch of fish per 5 gallons
Common tank sizes:
| Dimensions (L×W×H) | Volume |
|---|---|
| 24×12×16 in | ~20 gal |
| 36×18×16 in | ~45 gal |
| 48×18×20 in | ~75 gal |
Actual water volume is typically 10-15% less than calculated due to substrate, decorations, and not filling to the very top.