Aquarium Stocking Calculator

Fish count from tank volume, species, and filtration.

Tank Volume (gallons)

Filter Capacity (GPH)

Tank Type

Tab to move between fields

Recommended Stock (inches)

Max Fish Inches (base rule)20

Max Fish Inches (filtration-adjusted)20

Est. Small Fish (2″ avg)7

Est. Medium Fish (3.5″ avg)4

Filter Turnover (x/hr)5

Filtration Adequacy (%)100

Type LabelFreshwater

How to Use This Calculator

Enter Tank Volume (gallons), Filter Capacity (GPH), and Tank Type.
Review the Recommended Stock (inches) result.
Use Max Fish Inches (base rule) and Max Fish Inches (filtration-adjusted) to inform your decision.

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