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Calcimator

Bird Count Estimator

Estimate bird population size from point count survey data with distance-based detection correction and confidence intervals.

Inputs

meters
km²

Results

Population Estimate

5,093

Corrected Density

5.09 birds/ha

Raw (Uncorrected) Density2.55 birds/ha
95% CI Lower4,685
95% CI Upper5,500
Effective Detection Radius71 m
Coefficient of Variation4.1%
Survey Coverage7.9%
Sampling AdequacyGood
Total Count600
How to Use This Calculator
  1. Enter Number of Point Count Stations established across the study area.
  2. Input Average Birds per Station — the mean number of individual birds detected per point count.
  3. Set Detection Radius (meters) — typically 25-50 m for passerines, up to 100 m for raptors.
  4. Enter Detection Probability (0-1) based on species detectability and habitat conditions.
  5. Set Survey Replicates (number of visits) and Total Study Area (km²).
  6. Review Population Estimate and Corrected Density (birds/km²) for reporting and conservation planning.
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