What is the Normal Distribution Calculator?
Enter the mean and standard deviation, then a value (or two values) to find the probability below, above or between them. The tool also gives the z-score, and can do the reverse: find the value for a given percentile. A shaded bell curve shows the area.
How to use the Normal Distribution Calculator
- Enter the mean μ and standard deviation σ.
- Pick the type of probability and enter x (and x₂ for between).
- For inverse, enter a probability like 0.95.
What is a z-score?
z = (x - μ) / σ – how many standard deviations x is from the mean.
This Normal Distribution Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech