Cohens kappa measures the level of agreement between two raters or judges who each classify items into mutually exclusive categories. The formula for Cohen’s kappa is calculated as:

k = (p_o – p_e) / (1 – p_e)

where:

To find Cohen’s kappa between two raters, simply fill in the boxes below and then click the “Calculate” button.

Both raters said ‘Yes’

Both raters saids ‘No’

Only the first rater said ‘Yes’

Only the second rater said ‘Yes’

Cohen’s Kappa: 0.2857