📊 Normal Distribution Calculator
Calculate normal distribution probabilities
How Normal Distribution Calculation Works
- 1Enter the mean (μ) and standard deviation (σ) of your distribution.
- 2Specify the value or range you want the probability for.
- 3The tool computes the area under the bell curve and displays the probability with a visual graph.
About Normal Distribution Calculator
Calculate probabilities and percentiles for the normal (Gaussian) distribution. Enter mean and standard deviation to find areas under the curve.
Frequently Asked Questions
What is the 68-95-99.7 rule?
About 68% of data falls within 1 SD of the mean, 95% within 2 SDs, and 99.7% within 3 SDs.
Can I find a value from a percentile?
Yes. Enter a percentile and the calculator returns the corresponding value (inverse normal).