Pond Fish Stocking Calculator
Pond Fish Stocking
Calculate how many fish your pond can support
gallons
sq ft
feet
Formula
Max Fish = min(Volume / Gallons per Fish, Surface Capacity) x Filtration Factor
Frequently Asked Questions
How many koi can I have in my pond?
The general rule for koi is one fish per 250 gallons of water with good filtration. Koi grow large (up to 24+ inches) and are heavy waste producers. A 1,000-gallon pond can typically support 3-4 adult koi comfortably.
How deep should a fish pond be?
A fish pond should be at least 2 feet deep for goldfish and 3 feet deep for koi. In cold climates where the surface freezes, 4+ feet depth ensures fish can safely overwinter at the bottom where water stays above freezing.
Do I need a filter for my pond?
Yes, unless you have a very large, lightly stocked natural pond with plenty of aquatic plants. Filtration removes waste, maintains water quality, and supports healthy fish. A multi-stage filter with biological, mechanical, and UV components is ideal.
You may also need
~
Fish Tank Stocking Calculator
Free fish tank stocking calculator. Determine how many fish your aquarium can safely hold based on tank size, fish type, and filtration.
Everyday~
Aquarium Filter Size Calculator
Free aquarium filter size calculator. Determine the correct filter flow rate and type for your fish tank based on tank volume, fish load, and tank type.
Everyday