# Fish 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.

- URL: https://demo.fcrsoft.com/en/tools/fish-mortality-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) / Mortality Rate Calculator Free tool

# Mortality Rate Calculator

Enter the fish count at the start of the period, the deaths during the period and the average weight.
[See the system that does this automatically Open the live demo](https://demo.fcrsoft.com/login.php?package=farm)

## Calculator

Currency

Fish count at start of period : 50000 pcs
Number of dead fish : 750 pcs
Period : 30 days
Average weight : 300 g
Fish selling price : 6.5 USD /kg

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

## Results

Mortality rate
1.50 %

Survival rate
98.50 %

Daily mortality rate
0.050 %

Biomass lost
225
kg

Estimated financial loss
1,463 USD

**Track Mortality**These losses cost an estimated **1,463 USD**. FCRSOFT records mortality with its causes and raises an alarm when the threshold is crossed.
[Open the live demo](https://demo.fcrsoft.com/login.php?package=farm) [Fish Production Tracking Software](https://demo.fcrsoft.com/en/solutions/fish-production-tracking-software)

## How is it calculated?

- Mortality (%) = Dead ÷ Starting count × 100

- Daily mortality = Mortality ÷ Number of days

- Biomass lost = Dead × Average weight ÷ 1000

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.

- Mortalities are recorded with their causes and deducted from stock.

- An alarm is raised when the daily mortality threshold is exceeded.

- Causes and rates of mortality are tracked with periodic reports.

[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 ### Why Does FCR Rise in Fish? Overfeeding, temperature, low oxygen, stocking density, disease, feed quality, measurement error and stress: the 8 most common causes of rising FCR and how to fix them. Read the guide](https://demo.fcrsoft.com/en/fcr/why-does-fcr-increase) [Free tool ### Water Quality Checker Choose your species and enter temperature, dissolved oxygen, pH, ammonia, nitrite and salinity to see a good, caution or critical status for each parameter. Open the tool](https://demo.fcrsoft.com/en/tools/water-quality-checker) [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) [Solution ### Fish Production Tracking Software Batch-level tracking of fish stock, growth (biometrics), mortality, FCR and harvest. Monitor your production with real data and try the live demo. Explore the solution](https://demo.fcrsoft.com/en/solutions/fish-production-tracking-software)