Date Difference Calculator
Count the days, weeks, and months between two dates.
Standard Deviation Calculator
Calculate population or sample variance and standard deviation.
About the Standard Deviation Calculator
Calculate population or sample variance and standard deviation. It runs entirely in your browser — nothing is uploaded to a server, so it is fast and private. Just use it and go.
How to use the Standard Deviation Calculator
- Enter or paste your input into the tool above.
- Adjust any options to fit what you need.
- Copy or download the result.
Frequently asked questions
Is the Standard Deviation Calculator free?
Yes. This tool is completely free to use, with no sign-up required.
Is my data safe?
Everything runs locally in your browser. Your input never leaves your device.