Enter the total length, width, and height of livable water of your aquarium into the fish stock calculator to determine the amount of fish that can live in the aquarium.

## Fish Stock Formula

The following formula is used to calculate how much fish to stock an aquarium with.

“F = L*W*H*.004329*2

- Where “F is the inches of fish
- L is the length of livable water (in)
- W is the width of livable water (in)
- H is the height of livable water (in)

## Aquarium Stock Definition

**What is aquarium stock? **An aquarium stock is an amount of fish that someone should place in any given aquarium to allow for proper living space for fish. In general, this is usually provided as 2 inches of fish per gallon of water. This assumes proper filtration and care of the fish and aquarium.

## Example

How to calculate how much fish i can have in an aquarium?

**First, determine the length of water.**For this problem, the length of the aquarium is 10″.

**Next, determine the width.**In this example, the width is 12″.

**Next, determine the height.**Importantly, this should be the height of livable water. Do not include stones or air space in this height. In this example, the height is 10″.

**Finally, calculate the fish stock.**Using the formula, we find that we should stock this aquarium with (10*12*10)*.004329*2 = 10.389″ or rounding down, approximately 10 inches of fish. That could be 1 – 10 inch fish or 2 – 5 inch fishes etc.