# Stocking Density Calculator — How Many Fish per Cage?

> From cage or pond volume, target density, harvest weight and survival, calculate the biomass you can carry at harvest and the number of juveniles to stock.

- URL: https://demo.fcrsoft.com/en/tools/stocking-density-calculator
- Language: en
- Updated: 2026-10-03
- Publisher: FCRSOFT (https://fcrsoft.com)

[Demos](https://demo.fcrsoft.com/?hl=en) / [Free Tools](https://demo.fcrsoft.com/en/tools) / Stocking Density Calculator Free tool

# Stocking Density Calculator

Enter the volume, the target density at harvest and the expected survival rate to see how many juveniles to stock.
[See the system that does this automatically Open the live demo](https://demo.fcrsoft.com/login.php?package=farm)

## Calculator

Cage/pond volume : 2000 m³
Target density at harvest : 20 kg/m³
Harvest weight : 400 g
Expected survival rate : 85 %

This calculator runs in your browser; the data you enter is not stored.

## Results

Biomass at harvest
40,000
kg

Fish at harvest
100,000
pcs

Juveniles to stock
117,647
pcs

Juveniles per m³
58.8
pcs

**Monitor Your Biomass in Real Time**You should stock about **117,647** juveniles in this volume. FCRSOFT tracks stocking density live for every cage and warns you when the limit is exceeded.
[Open the live demo](https://demo.fcrsoft.com/login.php?package=farm) [Net-Pen Farming Software](https://demo.fcrsoft.com/en/solutions/net-pen-fish-farming-software)

## How is it calculated?

- Harvest biomass = Volume × Target density

- Fish at harvest = Harvest biomass × 1000 ÷ Harvest weight (g)

- Juveniles to stock = Fish at harvest ÷ Survival rate

FCRSOFT

## FCRSOFT does this for you automatically

You don’t need to do the calculations and checks on this page by hand every day. FCRSOFT derives them all automatically from the records entered in the field.

- Entering a sample weighing updates biomass and average weight.

- Mortality and harvest exits are deducted from stock automatically.

- Stocking density is tracked live for every cage.

[Open the live demo](https://demo.fcrsoft.com/login.php?package=farm) [Explore the Farm package](https://demo.fcrsoft.com/demo/farm?hl=en)

[demo.fcrsoft.com](https://demo.fcrsoft.com/login.php?package=farm)

## Related tools and guides

[Guide ### What Should Stocking Density Be? How is stocking density (kg/m³) set in cages, ponds and RAS? The effect of high density on FCR, growth and mortality, and the right stocking calculation. Read the guide](https://demo.fcrsoft.com/en/aquaculture/fish-stocking-density) [Free tool ### Fish Biomass Calculator Calculate total biomass from fish count and average weight, the remaining fish after survival, and cage/pond stocking density (kg/m³). Open the tool](https://demo.fcrsoft.com/en/tools/fish-biomass-calculator) [Free tool ### SGR and Growth Rate Calculator From two sample weighings, calculate the specific growth rate (SGR), daily weight gain and how many days it takes to reach the target weight at this rate. Open the tool](https://demo.fcrsoft.com/en/tools/sgr-growth-calculator) [Free tool ### Mortality Rate Calculator From the starting fish count and number of dead fish, calculate mortality and survival rate, daily mortality, biomass lost and the financial loss. Open the tool](https://demo.fcrsoft.com/en/tools/fish-mortality-calculator)