What this calculator does
Animal mortality rate works out percentage of a population lost to death over a period, accounting for births during that period. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaMortality rate = deaths / (opening stock + births) × 100
The inputs explained
| Field | What to enter |
|---|---|
| Opening stock (animals) | A number, measured in animals. Starts at 100. |
| Births during period (animals) | A number, measured in animals. Starts at 20. |
| Deaths during period (animals) | A number, measured in animals. Starts at 15. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with opening stock
Every other input is held at the calculator’s starting values while opening stock varies. Select any row to load that scenario into the calculator.