Calculateur de Standard Deviation
Calculate standard deviation for three values.
Formula and method
This calculator computes Population standard deviation directly in your browser without sending data to an external server.
Mathematical formula
- Population standard deviation:
√((a-(a+b+c) ÷ 3²+b-(a+b+c) ÷ 3²+c-(a+b+c) ÷ 3²) ÷ 3)
Variables and parameters
- Number 1 (a): default value 10.
- Number 2 (b): default value 12.
- Number 3 (c): default value 23.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Standard Deviation Calculator use?
Standard Deviation Calculator evaluates outputs such as <strong>Population standard deviation</strong> based on inputs including Number 1, Number 2, Number 3. Check the Mathematical Method section for the explicit formula.
What happens if I enter invalid or zero values into Standard Deviation Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Standard Deviation Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Standard Deviation Calculator free to use?
Yes. Standard Deviation Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Standard Deviation Calculator store or upload my data?
No. Standard Deviation Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Standard Deviation Calculator?
Standard Deviation Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Standard Deviation Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Standard Deviation Calculator to your own blog post or page.