TopToolsAiCalculate the standard deviation and variance of a list of numbers, both population and sample, together with the mean, median, mode, range and a table that shows the working.
Last updated: 21 Sep 2026
How to use Standard Deviation Calculator
- Paste or type your numbers, separated by commas, spaces or new lines.
- Click Calculate.
- Read the sample and population standard deviation and check the working table.
Frequently asked questions
Should I use sample or population standard deviation?
Use the sample standard deviation (dividing by n − 1) when your numbers are only a sample of a larger group. Use the population standard deviation (dividing by n) when your numbers are the entire group.
What does a high standard deviation mean?
It means the values are spread far away from the mean. A low standard deviation means they are clustered close to it.
Is this calculator free to use?
Yes, it is completely free, with no signup or account required.
Does my data get uploaded anywhere?
No. Everything is calculated in your browser and nothing is sent to our servers.
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