Diagnostic calculator

Enter the test's sensitivity and specificity, the number of people with the outcome and the sample size, then press Calculate.

Inputs

Confusion matrix

Fill in the four inputs and press Calculate.

Total patients–

Diseased patients
(patients with the outcome)–

Non-diseased patients
(patients without the outcome)–

TP–

FN–

TN–

FP–

Non-diseased = sample size - diseased. TP = sensitivity x diseased; FN = diseased - TP. TN = specificity x non-diseased; FP = non-diseased - TN. Counts are expected values and can be fractional.