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Aquarium Size Calculator

Everyday life
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Calculates the appropriate aquarium size based on the type and number of fish.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Type of Fish and Number of Fish in the units shown.

Step 2

Read Inches per Fish, Total Inches of Fish, Minimum Gallons Needed, Tank Height, Tank Width, Tank Length, and Recommended Tank Size in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Small Fish Community

Type of Fish: Small Fish (1 inch); Number of Fish: 10

Inches per Fish: 1 inches; Total Inches of Fish: 10 inches; Minimum Gallons Needed: 10 gallons; Tank Height: 12 inches; Tank Width: 10 inches; Tank Length: 20 inches; Recommended Tank Size: Minimum tank size: 20x10x12 inches (10 gallons)

Medium Fish Community

Type of Fish: Medium Fish (2-3 inches); Number of Fish: 5

Inches per Fish: 2.5 inches; Total Inches of Fish: 12.5 inches; Minimum Gallons Needed: 12.5 gallons; Tank Height: 16 inches; Tank Width: 12 inches; Tank Length: 24 inches; Recommended Tank Size: Minimum tank size: 24x12x16 inches (12.5 gallons)

Large Fish Community

Type of Fish: Large Fish (4-6 inches); Number of Fish: 2

Inches per Fish: 5 inches; Total Inches of Fish: 10 inches; Minimum Gallons Needed: 10 gallons; Tank Height: 12 inches; Tank Width: 10 inches; Tank Length: 20 inches; Recommended Tank Size: Minimum tank size: 20x10x12 inches (10 gallons)

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