Everyday tool
Standard Deviation Calculator
Paste a list of values, choose whether they are a sample or the full population, and calculate the statistics locally.
Runs in your browser. No upload.
Enter valid numbers and choose population or sample.
Count
Average
Variance
Standard deviation
About this tool
Standard Deviation Calculator made simple.
The population formula divides squared deviations by N; the sample formula uses N − 1 (Bessel’s correction). Values are parsed using your locale, and your data stays in this browser.
Common questions
About Standard Deviation Calculator.
How do I calculate standard deviation?
Paste your data values, choose sample or population, then calculate. The result includes variance, mean and the number of values.
Should I use sample or population standard deviation?
Use population when your data includes the entire group you are studying. Use sample when it is only a subset; the sample formula divides by n − 1.