Formula and method
This calculator uses the values you enter and applies the calculation immediately in your browser. The main output formulas are:
- Mean:
(v1+v2)/2 - Population std dev:
Math.sqrt((Math.pow(v1-(v1+v2)/2,2)+Math.pow(v2-(v1+v2)/2,2))/2)
Some formulas are undefined for certain input combinations, such as division by zero, equal x-values in a slope calculation, or logarithms of non-positive numbers. In those cases the live tool reports that the result is undefined instead of displaying Infinity or NaN.
Examples
- Example: with Value 1 = 10, Value 2 = 20, this calculator returns Mean = 15, Population std dev = 5.
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Frequently asked questions
Is Mean & Std Deviation Calculator (Two-Value) free to use?
Yes. Mean & Std Deviation Calculator (Two-Value) is completely free, has no usage limit, and does not require an account, email, or API key.
Does Mean & Std Deviation Calculator (Two-Value) store or upload my data?
No. Mean & Std Deviation Calculator (Two-Value) calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Mean & Std Deviation Calculator (Two-Value)?
Mean & Std Deviation Calculator (Two-Value) 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 Mean & Std Deviation Calculator (Two-Value) on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Mean & Std Deviation Calculator (Two-Value) to your own blog post or page.
SEO and sharing notes
This page has a single clean canonical URL, descriptive metadata, breadcrumb structured data, and internal links to related tools. Supported calculators and converters can also copy a prefilled share link without changing the canonical index URL.