About the site

About ONLINTools

ONLINTools is a free, English-language collection of calculators and practical guides for health, finance, photography, date and time, and developer tasks, with no account required for standard tools.

Last updated August 2, 2026

What we publish

The site combines interactive calculators with plain-English guides. Current topics include health and fitness estimates, personal finance formulas, photography settings, date and time conversions, network calculations, and developer utilities.

Standard tools are free to use without creating an account. Results are intended to help with everyday decisions and learning; health, finance, and legal outputs are informational and do not replace advice from a qualified professional.

How we make calculators and guides

Show the method

Calculator pages explain the relevant formula, inputs, assumptions, and limits when those details materially affect the answer.

Answer a real question

Guides begin with a direct answer, then use worked examples, practical settings, or troubleshooting steps to help the reader act.

Name the source

Time-sensitive or specialist claims link to primary or authoritative references whenever a suitable source is available.

Read the full editorial policy

How tool data is processed

Most standard calculations run locally in your browser. Tools that require live data or AI analysis may send only the input needed to process that request.

Relevant tool pages describe those exceptions. The privacy policy covers analytics, advertising, uploaded images, third-party services, and the controls available in your browser.

Read the privacy policy

Editorial responsibility

Guides are published by the ONLINTools Editorial Team. Its author page lists the published guides and the review standards used for formulas, examples, sources, and limitations.

View the editorial team profile

Corrections and contact

To report a factual, formula, accessibility, or citation issue, email the page URL and a short explanation to [email protected]. Reproducible issues are reviewed and corrected when warranted.