Empirical Rule Calculator
Calculate 68%, 95%, and 99.7% data ranges within one, two, and three standard deviations of the mean using the empirical rule for any normal distribution.
About This Calculator
Apply the 68-95-99.7 empirical rule to normal distributions.
Frequently Asked Questions
What is the empirical rule?
68% of data falls within 1sigma, 95% within 2sigma, 99.7% within 3sigma of the mean.