Mark-Recapture Calculator

Estimate population size using capture-mark-recapture methods for wildlife studies.

Method Selection

Estimation Method

Marked in First Capture (M)

Total in Second Capture (C)

Recaptured with Marks (R)

Lincoln-Petersen: N = MC/R
Chapman: N = (M+1)(C+1)/(R+1) - 1

Chapman Estimate (N̂)

763

95% CI: 453 - 1073

Petersen Est.

800

Bailey Est.

756

Capture Prob.

15.0%

20.8%

First Capture (M)100

Second Capture (C)120

Recaptured (R)15

Standard Error158.31