Sensitivity and Specificity Calculator

Find a test's sensitivity and specificity.

Sensitivity (%) 90

Specificity (%) 80

Formula: sensitivity = TP/(TP+FN); specificity = TN/(TN+FP)

Step-by-step with your numbers:

1. Values used:

2. True positives = 90

3. False negatives = 10

4. True negatives = 80

5. False positives = 20

7. Sensitivity = 90%

8. Specificity = True positives - False negatives = 90 - 10 = 80%

Did we solve your problem today?

Sensitivity catches true positives; specificity correctly rules out negatives.

The math behind it

Sensitivity (recall) = TP/(TP+FN). Specificity = TN/(TN+FP).

TP 90, FN 10, TN 80, FP 20 → sensitivity 90%, specificity 80%.

Which matters more?

Screening favors high sensitivity; confirmation favors high specificity.