Negative Predictive Value Calculator

Enter the true negative rate and the false negative rate into the calculator to determine the negative predicted value.

Negative Predictive Value Formula

The following formula is used to calculate a negative predictive value.

NPV = TNR / (TNR + FNR)

  • Where NPV is the negative predictive value
  • TNR is the true negative rate
  • FNR is the false negative rate

FAQ

What is a negative predictive value?

A negative predictive value is the probability or change that people who get a negative test result, actually do not have whatever was being tested for. In other words, it’s a measure of how accurate a given test is.

What is a positive predictive value?

A positive predictive value is the probability that you actually have a disease given a positive test results.


Example

How to calculate negative predictive value?

  1. First determine the true negative rate.

    Calculate the rate at which a true negative test results is found.

  2. Next, determine the false negative rate.

    Calculate the rate at which a negative test results in a false negative.

  3. Finally, calculate the negative predictive value.

    Using the formula, calculate the NPV.


negative predictive value calculator
negative predictive value formula

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