standard deviation calculator
Measure spread using standard deviation.
Formula
Variance = Σ(x − mean)² / (n−1 for sample; n for population); SD = √variance
Data type = Sample (n−1)
How to use
- Enter values separated by semicolons.
- Choose sample or population.
- Read spread, mean and count.
Examples
- Population 2;4;4;4;5;5;7;9: variance 4, SD 2.
- Sample 1;2;3: variance 1, SD 1.
Frequently asked questions
How do I format a list?
Separate numbers with semicolons or newlines. Use a decimal point and no digit grouping.
Which setting should I use?
Use population for the complete group; sample when estimating its variance from observations. Sample needs at least 2 values.
What units does variance use?
Variance uses squared data units; standard deviation uses the original units. Up to 200 values are supported.
Sources
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