# Poultry Mortality Calculator

> Work out cumulative flock mortality, livability, birds remaining and the average daily and weekly mortality rate from birds placed, deaths and culls.

Category: Agriculture · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/poultry-mortality-calculator

Cumulative mortality is the birds lost (dead plus culled) as a share of the birds placed. Spread over the days since placement, it gives a daily rate you can compare between flocks.

Also called: Flock mortality calculator, Livability calculator.

## Inputs
- Birds placed (default 5000)
- Birds found dead (default 150)
- Birds culled (default 50; optional)
- Days since placement (default 42)

## Results
- Cumulative mortality
- Livability
- Birds remaining
- Deaths
- Culls
- Average mortality per day
- Average mortality per week

## Formula

```
Mortality % = (Dead + Culled) ÷ Placed × 100;  Livability % = 100 − Mortality %;  Daily % = Mortality % ÷ Days
```

Where:
- Placed: birds at the start of the flock
- Dead, Culled: cumulative losses to date
- Days: days since placement

## Worked example
1. Losses = 150 + 50 = 200 birds.
2. Mortality = 200 ÷ 5,000 = 4%; livability = 96%; 4,800 birds remain.
3. Average per day = 4% ÷ 42 = 0.095%.

**Result:** Losing 200 of 5,000 birds in 42 days is 4% cumulative mortality, about 0.095% a day.

## What the result means

Mortality is rarely even: the first week and heat or disease events dominate. Record losses daily and look at weekly figures to spot problems early; a sudden rise warrants a vet’s attention.

## Assumptions and limits
- Culls count as losses alongside deaths.
- The daily figure is an average and hides peaks.
- Birds moved out or sold early are not counted as losses; subtract them from birds placed if needed.

## Questions

### Should culls count as mortality?

Most flock records report total losses (dead plus culled) and also show each separately, as this calculator does.

### What is a normal mortality rate?

It depends on the bird type, age, housing and region. Compare with your own records and with your breed company’s or integrator’s targets.

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Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/poultry-mortality-calculator