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Calculate the standard deviation of a set of numbers.
About this tool
Calculate the standard deviation of a set of numbers.
The Standard Deviation Calculator helps you understand how spread out numbers are from their average value. It's useful for statistical analysis and quality control.
Open Standard Deviation Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
No need to manually compute each step
Instant feedback on your dataset
Learn about statistical concepts
It measures the average amount by which numbers differ from the mean.
Enter your data in the 'Values' field, separated by commas. Click calculate to see the results.
Yes, you can enter decimal numbers as well as integers.