Calculate population or sample standard deviation with detailed statistical breakdowns.
Standard Deviation:
Copied

About Standard Deviation

Standard deviation measures how spread out values are around the mean. A low value indicates data points are close together, while a high value shows greater variability.

Population vs Sample

Population standard deviation is used when your data represents the entire group. Sample standard deviation applies when your data is a subset of a larger population.

How This Calculator Works

The calculator finds the mean, computes each value’s squared deviation, averages them (or divides by n−1 for samples), and then takes the square root.

FAQs

What formats are supported? Commas, spaces, or line breaks.
Is this exact? Yes, results are mathematically precise.
Can I use decimals? Yes, decimals are fully supported.