Math
Standard Deviation Calculator
Calculate variance and standard deviation.
Calculated in your browser. Free, nothing is uploaded.
About this tool
Free standard deviation calculator tool. Calculate variance and standard deviation. No signup, nothing uploaded.
Frequently asked questions
How precise are the results?
Double-precision floating point, accurate for everyday maths.
Is anything sent to a server?
No. All calculations run locally.
Can I see the steps?
Where shown, the tool includes the working.
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