Aquarium Calculator
Calculate the volume of your aquarium in gallons or liters, and estimate the weight of water and substrate needed.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
How to Use the Aquarium Calculator
This calculator estimates your aquarium's water volume, water weight, and optional substrate weight. All measurements must be in inches.
- Enter dimensions: Fill in Length, Width, and Height (inches). All must be positive numbers.
- Choose volume unit: Select Gallons or Liters from the dropdown.
- Add substrate (optional): Enter the substrate depth in inches to estimate its weight.
- Calculate: Click the Calculate button.
Results explained:
- Volume – Total water capacity in your chosen unit.
- Water Weight – Weight of the water (lbs for gallons, kg for liters).
- Substrate Weight – Approximate weight of the substrate (shown only if depth is provided).
Use the formula shown below the results for manual verification.
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
Measure the length, width, and height of the aquarium in inches from the inside edges. For accurate volume, exclude the thickness of the glass or acrylic.
The substrate weight is an approximation based on an average density of 80 lbs per cubic foot (1.28 kg/L). Actual weight may vary depending on the type of substrate (e.g., gravel, sand, soil).
This calculator is designed for rectangular aquariums. For bow-front or cylindrical tanks, different formulas are required.