Data Index Calculations

Rule Calculation

Empirical rule is the statistical rule for a normal distribution determined with the mean and the standard deviation. According to it, 68 % of data falls within first SD, 95 % within first two SD and 99.7 % within first three SD's. Hence it is also known as 68-95-99.7 or three sigma rule. Find the Empirical rule for the given set of data using this calculator.

Total Numbers
Mean (Average)
Standard Deviation
Empirical Rule at 68% falls between
Empirical Rule at 95% falls between
Empirical Rule at 97.7% falls between