Accuracy first
Each calculator implements a standard, published formula shown on its page. Before publishing we verify outputs against independently hand-calculated examples, and each worked example on a calculator page is generated from the same code that powers the tool.
Sources
We rely on standard financial mathematics, official statistics and reputable reference works. Cultural content (such as number symbolism) is presented as tradition and belief, never as prediction. Where we summarise reporting, we paraphrase and credit the original publisher.
Review & updates
Pages display the date they were last reviewed. We revisit calculators when underlying rules or common assumptions change.
Independence
Advertisers, sponsors and partners have no influence over calculator logic, results or editorial conclusions. Sponsored content is always labelled.
Corrections
Found an error? Use our contact form with the page URL and inputs. Verified corrections are fixed promptly and noted where material.
Not advice
Our content is educational. It is not personalised financial, investment, tax or legal advice. Consult a qualified professional for decisions about your situation.
Last updated: October 27, 2026