What is Standard Deviation Calculator?

A standard deviation calculator measures how spread out numbers are in a data set. It computes both population and sample standard deviation along with mean, variance, and other descriptive statistics — essential for understanding data variability in research, finance, and quality control.

How to use

1. Enter your numbers separated by commas, spaces, or one per line in the input field.
2. Choose between population standard deviation (σ) for complete data sets or sample standard deviation (s) for data samples.
3. View the calculated mean, variance, standard deviation, and other statistics. Copy the results or download them as needed.

Result

You have test scores: 85, 90, 78, 92, 88, 76, 95, 82. Enter these values, select sample standard deviation, and get s = 6.61 with a mean of 85.75, showing moderate score spread around the average.

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