# 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.