AdBlocker Detected
adblocker detected
Calculatored depends on revenue from ads impressions to survive. If you find calculatored valuable, please consider disabling your ad blocker or pausing adblock for calculatored.

InvNorm Calculator


Table of Content


The invnorm calculator determines the opposite normal probability distribution by sketching their graph. This calculator also evaluates the confidence interval along with their two tails and left-right values based on the probability, mean, and standard deviation.

What is Invnorm?

Invnorm is the short form of inverse normal distribution. It is defined as;

It is the method of using the known probabilities in order to determine the reciprocal of a random variable and the z critical value in the normal distribution.

It has a bell-shaped curve graph that illustrates the technique of working to find the x-value

Invnorm Formula:

For a given area below a certain value, the invnorm is used for calculating a known probability to determine the corresponding z-critical value in a normal distribution. 

By the below invnorm formula, you can find the inverse of normal distribution. 

$$ f(x)=\frac{1}{\sqrt{2\pi\sigma^2}}e^{-\displaystyle{\frac{(x-\mu)^2}{2\sigma^2}}} $$


  • μ _ Arithmetic mean of the distribution
  • σ _ variance that measures the dispersion 
  • e _ Exponential functions
  • x _ Independent variable

Steps To Use The Calculator?

The inverse normal distribution calculator works by taking some inputs into account. So, look at these points:

What To Do?

  • Insert the value of the probability 
  • Enter the mean and standard deviation 
  • Tap “Calculate”

What You Get?

  • Left, Right, and two tail values 
  • Standard Deviation with the graph indication


Wikipedia: Inverse distribution, Relation to original distribution, Examples.

Alan Walker

Studies mathematics sciences, and Technology. Tech geek and a content writer. Wikipedia addict who wants to know everything. Loves traveling, nature, reading. Math and Technology have done their part, and now it's the time for us to get benefits.

Submit Your Review