Terms of Use
Last updated 5 October 2026. These terms describe how to use Calculation Guide's free tools and explanatory pages.
Using the calculators
You may use the calculators for lawful personal, educational or business tasks. No account or payment is required. Enter values that fit the form's stated range and read the formula, assumptions and limits shown on the relevant tool page.
Please do not interfere with site access, attempt to misuse the service or present Calculation Guide as an official medical, financial or government service.
What an answer means
Calculation Guide provides general information from the inputs and rules displayed. A result may be wrong if an input is wrong, a rule has changed or the real situation includes details the tool does not model. We work to correct reported errors, but we cannot promise that every result will fit every decision or that the site will always be available.
Health outputs are screening or dating estimates, not diagnoses. Finance outputs are mathematical illustrations, not a quote, product offer or professional recommendation. Check important decisions against current source documents and qualified advice where appropriate. More detail is on the Disclaimer page.
Content and source links
Calculation Guide's interface, code and original explanations are provided for use through this site. You may link to a calculator page and refer to a result you generate. If you want to republish substantial site text, images or code, ask us first. This does not restrict rights you already have under applicable law.
Some pages link to third-party sources so you can check a definition or convention. Those sites control their own content and policies. A link does not mean the source endorses Calculation Guide.
Advertising
Calculation Guide may display advertising from Google and its partners. Ads are labeled, are not part of a calculation, and do not change results. Please do not click ads deliberately or encourage others to do so. How ad cookies are used is explained in the Privacy Policy and Cookie Policy.
Updates and questions
We may update tools, explanations or these terms as the site develops. Material changes to these terms will be reflected by the date at the top of this page. Questions and correction reports can be sent to naveedqadir8149@gmail.com; the Contact page explains what to include.