๐พ Pets
Fish Tank Stocking Calculator
Surface area limits oxygen exchange, which is why the old rule uses square inches of surface rather than volume alone. Long, shallow tanks can support more fish than tall ones of the same volume because more water touches the air.
How it works
Tank volume
Tank length
Tank width
Total inches of fish now
Filtration
Surface area
Stocking capacity
Current load
Verdict
Note
Frequently asked questions
How do I use the Fish Tank Stocking Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.