Biology
Find the percentage of animals lost over a period.
Your inputs
Change any value — everything updates instantly.
Starting count.
Losses in the period.
Try an example
Mortality rate
3 %
This means 3% of animals were lost.
What you are seeing
Each bar grows to show a result for your inputs.
The top bar is the main answer: 3 %.
Change deaths (now 15) and the bars update instantly.
Survival
97 %
100 − mortality.
Remaining
485 head
Start − deaths.
Result explanation: Mortality rate
3 %.
Real-life comparison: With deaths 10% higher, the answer would be 3.3.
Low, normal or high? Use this as an estimate based on the stated formula.
How the result changes with deaths
How to read this chart: The line shows the result across a range of values. The dot marks your input.
Find the percentage of animals lost over a period.
This means 3% of animals were lost.
Does not adjust for animals added mid-period.
A simple cumulative loss rate.
rate = deaths ÷ start × 100
Symbols
Why this formula works
A simple cumulative loss rate.
Unit check
Units match on both sides ✓
Worked example
Common mistakes
This means 3% of animals were lost.
Depends on species and stage — compare with local benchmarks.
Track separately.
Keep consistent.
Not deaths.
Reviewed 2026-09-25 · Next review 2027-09-25
Important limitation. Does not adjust for animals added mid-period.
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