Mark-Recapture Population Estimator
Estimate wild population size using the Lincoln-Petersen mark-recapture method with Chapman correction and confidence intervals.
Inputs
Results
Population Estimate (N)
300
Chapman Estimate282
95% CI Lower130
95% CI Upper470
Standard Error87
Recapture Rate16.7%
Sampling AdequacyAdequate
Marking Fraction16.67%
How to Use This Calculator
- Enter Marked in First Capture (M) — the number of animals marked and released.
- Record Total Second Capture (C) — all animals caught in the second sample.
- Count Recaptured Marked (R) — marked individuals in the second sample.
- Review Population Estimate (N) using the Lincoln-Petersen method and the Chapman corrected estimate.
- Check 95% CI Lower and Upper bounds — narrow the interval by increasing sample size (larger C).
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