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PPV Calculator

Compute PPV = sens·prev / (sens·prev + (1−spec)(1−prev)).

Input Data

Input Sensitivity sens.
Input Specificity spec.
Input Prevalence prev.

Results

0.470588
PPV = sens·prev / (sens·prev + (1−spec)(1−prev)).

At a glance:PPV Calculator: enter parameters to compute results; complements related calculators.

Formula

PPV = sens·prev / [sens·prev + (1−spec)(1−prev)].

How to Use

  1. Enter sensitivity, specificity and prevalence.
  2. It returns PPV.

Case Studies

sens=0.8, spec=0.9, prev=0.1 → PPV≈0.471

PPV = 0.08/(0.08+0.09) ≈ 0.4706.

FAQ

Why is PPV low when prevalence is low?

Most positives are false alarms, so PPV drops despite a good test.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:PPV Calculator（/statistics/positive-predictive-value）。