Estimate how heavily you can stock a freshwater aquarium using the classic one inch of adult fish per gallon guideline, along with a more conservative figure that many keepers prefer. Enter your tank volume and the adult length of the fish you plan to keep, and the tool works out how many that comes to under the traditional rule and under a stricter one inch per two gallons approach that leaves more room for waste, oxygen, and swimming space. The inch per gallon rule is only a rough starting point, since body shape, waste output, territory, and filtration all matter, and it does not apply to large or messy species. Treat the numbers as a sanity check, research each species properly, and understock rather than overstock. Everything is calculated in your browser as general hobby guidance, not a strict rule.
Estimate how heavily you can stock a freshwater aquarium using the classic one inch of adult fish per gallon guideline, along with a more conservative figure that many keepers prefer. Enter your tank volume and the adult length of the fish you plan to keep, and the tool works out how many that comes to under the traditional rule and under a stricter one inch per two gallons approach that leaves more room for waste, oxygen, and swimming space.
Yes. Fish Tank Stocking Calculator is completely free, with no sign-up and no usage limits.
Yes. Fish Tank Stocking Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Fish Tank Stocking Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.