Fish Stocking Calculator
Estimate how many fish fit a tank using the one-centimetre-per-litre guide.
Quick answer: enter your details below and click Estimate Fish Stocking — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter tank volume in litres.
- Pick adult fish size.
- Click Estimate Fish Stocking.
About this tool
Enter tank volume and adult fish size, and the tool estimates a maximum count from the simple guide of one centimetre of adult fish per litre. This is a rough starter guide, not expert advice, since species, filtration, and behaviour change safe stocking a great deal.
Frequently asked questions
Is this expert advice?
No. It is a starter guide. Species-specific research matters more than any single rule.
Do plants change stocking?
Plants help water quality, but they do not turn an overstocked tank into a safe one.