About This Tool
### Know Your Actual Water Volume
Buying a "55 Gallon" tank? It might only hold 45 gallons of water.
* **Displacement**: Gravel, rocks, and decorations take up space.
* **Dimensions**: Manufacturers round up numbers. External dimensions include the glass thickness.
Accurate volume is critical for dosing **Medication** (don't overdose!) or adding **Fertilizer**.
### Water Weight Warning
Water is heavy (8.34 lbs/gal). A 55-gallon tank weighs over **600 lbs** once filled with water and gravel. Ensure your floor and stand can support it!
Key Features
- **Shape Support**: Rectangle, Cube, Cylinder/Column, and Bowfront.
- **Weight Calculator**: Estimates the filled weight (water + tank).
- **Unit Conversion**: Shows Gallons and Liters instantly.
- **Bowfront Math**: Accurate geometry for curved front tanks.
Frequently Asked Questions
Does this account for substrate/gravel?
No. This tool calculates the *empty* tank volume. To find actual water volume, you typically subtract 10-15% for gravel and decorations.
Why are my dimensions different from the box?
Tank manufacturers often list 'nominal' sizes (e.g., '40 Breeder'). Actual dimensions can vary by brand. Always measure your specific tank.