Sensitivity and Specificity Calculator

This application will work out the Sensitivity and Specificity from the data you provide below.
Insert whole numbers for 'a' to 'd'

            Expected Result (Known Status)

 

Positive
Negative
  

Positive:

a

b

a = known positive; test result positive (correct positive)
c = known positive; test result negative (false negative)
b = known negative; test result positive (false positive)
d = known negative; test result negative (correct negative)

Negative:

c

d


  

 

Sensitivity = a/(a+c)

%
 

Specificity = d/(b+d)

%

If you wish to calculate the Positive Predictive Value and the Negative Predictive Value from your results above click below:

To work out PPV and NPVs from pre-calculated sensitivity and specificity values, go directly to the PPV-NPV Calculator

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