Home Back

Aquarium Gallon Size Calculator

Aquarium Volume Formula:

\[ V_{gal} = \frac{L \times W \times H}{231} \]

inches
inches
inches
gallons

Unit Converter ▲

Unit Converter ▼

From: To:

1. What is an Aquarium Gallon Size Calculator?

Definition: This calculator estimates the water volume of an aquarium in gallons based on its length, width, and height measurements in inches.

Purpose: It helps aquarium owners and hobbyists determine the appropriate tank size and water volume for their fish and aquatic plants.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V_{gal} = \frac{L \times W \times H}{231} \]

Where:

Explanation: The dimensions are multiplied to get cubic inches, then divided by 231 to convert to gallons.

3. Importance of Aquarium Volume Calculation

Details: Proper volume estimation ensures appropriate fish stocking levels, correct filtration capacity, and proper dosing of water treatments.

4. Using the Calculator

Tips: Measure the inside dimensions of your aquarium (excluding glass thickness) in inches. Enter all three dimensions for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 231?
A: There are 231 cubic inches in one US gallon, which is the standard conversion factor.

Q2: Should I include the glass thickness in measurements?
A: No, measure only the interior water-holding space for accurate volume calculations.

Q3: How does shape affect the calculation?
A: This formula works for rectangular tanks. Other shapes require different formulas.

Q4: Does this account for decorations and substrate?
A: No, the result shows total capacity. Actual water volume will be less when accounting for these items.

Q5: What's a good size for beginners?
A: A 20-30 gallon tank is often recommended as it's more stable than smaller tanks.

Aquarium Gallon Size Calculator© - All Rights Reserved 2025