Press & Media

NumberCalcs is a free statistics tool site used by students, researchers, and educators. This page is for journalists, writers, and researchers who want background on what the site does, who built it, or how to cite tool results in published work.

What NumberCalcs does

The site provides free, client-side statistics calculators and reference tables — t-tests, chi-square tests, z-score tables, p-value calculators, confidence intervals, binomial distributions, power analysis, and more. Every calculator shows the full step-by-step derivation so readers can verify the method, not just the output. All calculations run in the browser; no data is transmitted or stored.

The tools follow published statistical standards: Welch's (1947) formulation for the two-sample t-test, Pearson's original chi-square, Cohen's conventions for power analysis, and NIST §1.3.6.7.1 for the standard normal distribution table. Reference tables are numerically verified against SciPy.

For journalists and writers

If you are writing about statistics education, online learning tools, data literacy, or related topics and want background information, a quote, or a brief explanation of how a specific statistical method works — use the contact below. We can speak to how students and researchers actually use these tools and where common misunderstandings arise (p-value interpretation, one-tailed vs two-tailed tests, sample size requirements).

Citing NumberCalcs in published work

If you used a NumberCalcs calculator to verify a result in a paper, article, or report, a straightforward citation format is:

NumberCalcs. (2026). [Calculator name]. Retrieved [date] from [URL]. All calculations performed client-side; verified against SciPy statistical library.

For academic work where the tool is used only for verification of hand calculations, a footnote citing the URL is typically sufficient. If the tool is the primary computational method, treat it as software and include the URL, access date, and the underlying formula standard (e.g., "Welch's two-sample t-test, Welch 1947").

Statistics and coverage

NumberCalcs launched in March 2026 and covers 14 tools across statistics, hypothesis testing, and distribution reference tables. Available in English, Turkish, and Ukrainian. All tools are free; no advertising is currently served.

Contact

Press inquiries: [email protected]

Response time: within 2 business days for press and media requests. Formula corrections and tool feedback are also welcome at the same address.