What This Calculator Is Best For
Use it to estimate Ne from breeding male and female counts.
- Assess breeding population structure.
- Compare sex-ratio scenarios.
- Plan conservation genetics notes.
Effective Population Size Calculator
Calculate effective population size from breeding male and female counts.
Biologypopulation-geneticseffective-population-sizene
Effective Population Size Calculator Formula
Ne = 4NmNf / (Nm + Nf)Enter the known values and the calculator applies this formula to produce the main result, plus supporting values that help you check the answer.
| Symbol | Variable | Description |
|---|---|---|
| males | Breeding males (Nm) | Breeding males (Nm) used by the calculator. |
| females | Breeding females (Nf) | Breeding females (Nf) used by the calculator. |
How to Use the Effective Population Size Calculator
- 1
Enter the known values
Fill in the fields and confirm that the units match the formula shown on the page.
- 2
Click Calculate
The primary answer appears in the highlighted row, with related check values underneath.
- 3
Read the result
Balanced sex ratios keep Ne closer to census size; uneven ratios reduce effective population size.
How to Read the Result
Balanced sex ratios keep Ne closer to census size; uneven ratios reduce effective population size.
Before You Rely on the Result
This sex-ratio model does not include variance in family size or overlapping generations.
Effective Population Size Calculator FAQ
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