Pond stocking calculator

Your pond

Pond volume (US gallons)

Surface area (sq ft)

Stocking check

Add at least one fish below to see a stocking check.

Fish

Enter counts and current body lengths, from nose to tail base. Leave unused species at zero.

These limits are planning estimates. Filtration, ammonia production and oxygen reserves during pump failure are not modeled. Test the water and assess fish health before adding fish.

Stocking method

area capacity used = Σ (count × length × D) : binds if this exceeds your surface area volume capacity used = Σ (count × length × G) : binds if this exceeds your gallons D = 1 sq ft/in goldfish-type · 3 sq ft/in koi G = 20 gal/in goldfish-type · 35 gal/in koi

Each fish uses an allowance based on its category and length. The result compares the summed allowances with the pond’s area and volume. Adult lengths are estimates and vary with genetics and conditions; growth timing is unavailable for some species.