➗ Math
Standard Deviation Calculator
Standard deviation measures how far values typically sit from the mean. The population version divides by n and the sample version by n minus one, which corrects for the fact that a sample underestimates spread.
How it works
Numbers (comma separated)
Population standard deviation
Sample standard deviation
Population variance
Sample variance
Mean
Standard error of the mean
Frequently asked questions
How do I use the Standard Deviation Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.