Chick Mortality Rate Calculator

Work out chick mortality rate instantly with clear inputs, formula shown and shareable results.

About Chick Mortality Rate Calculator

Mortality counts birds that died; depletion adds culls, and it is depletion that determines how many birds reach the market. Expressing it per day highlights whether losses are a single early event, such as a brooding failure, or a steady drift that suggests disease or management problems.

Formula

Mortality and depletion

Mortality % = deaths x 100 / placed; depletion % = (deaths + culls) x 100 / placed

Worked example

With the default values below, Chick Mortality Rate Calculator returns Mortality Rate of 3.800%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Chicks Placedminimum 1: 10,000
Chicks Diedminimum 0: 380
Chicks Culledminimum 0: 90
Age At Assessmentminimum 1 days: 42 days

Results

Mortality Rate: 3.800%
Total Depletion Rate: 4.700%
Birds Surviving: 9,530
Average Daily Depletion: 0.1119%

Step by step

1Values used
2Mortality and depletion
3Mortality Rate= 3.800
4Total Depletion Rate= 4.700
5Birds Surviving= 9,530
6Average Daily Depletion= 0.1119

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What mortality is acceptable?

Under 4-5% total depletion over a 42-day broiler cycle, with first-week mortality below 1%. High first-week loss usually points to chick quality, brooding temperature or water access.

Why record culls separately?

Culls reflect leg problems, ascites and runting rather than acute disease. A rising cull rate with flat mortality points to nutrition, stocking density or genetics.