Empirical Rule Calculator
Calculate ranges for 68%, 95%, and 99.7% of data in a normal distribution.
Average value
Spread of data
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Normal Curve Regions
68% (±1σ)
85 to 115
Approximately 68% of the data falls within this range.
95% (±2σ)
70 to 130
Approximately 95% of the data falls within this range.
99.7% (±3σ)
55 to 145
Approximately 99.7% of the data falls within this range.
Frequently Asked Questions
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