PPV / NPV
Calculate PPV / NPV instantly with the exact formula and a worked example.
PPV / NPV
True positives (TP)
False positives (FP)
True negatives (TN)
False negatives (FN)
PPV (positive predictive value)
75%
NPV (negative predictive value)
94.44%
Prevalence
33.33%
Sensitivity
90%
Specificity
85%
More about: PPV / NPV
What it calculates
The “PPV / NPV” calculator computes PPV (positive predictive value) in % from 4 parameters: true positives (tp), false positives (fp), true negatives (tn), false negatives (fn).
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters True positives (TP) = 90, False positives (FP) = 30, True negatives (TN) = 170, False negatives (FN) = 10 the result is 75 % (PPV and NPV depend on prevalence in the sample).
How to use
- Enter true positives (tp), false positives (fp), true negatives (tn) and false negatives (fn) — each field above is adjustable with a slider.
- PPV (positive predictive value) (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is PPV / NPV calculated?
The PPV / NPV calculator computes PPV (positive predictive value) (in %) from true positives (tp), false positives (fp), true negatives (tn), false negatives (fn). Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the PPV / NPV calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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