Methodology

This page explains how Calc Omniverse calculators are designed, verified, and kept up to date.

1. Choosing formulas

Every formula relies on a verifiable source: a reference textbook for mathematical and physics calculations, an official text (service-public.fr, the WHO, etc.) for regulated or medical topics. Rates and brackets that change over time (taxes, contributions) are dated in the code and come with an annual review reminder — they are never mixed between two different years.

2. Verification before publication

Before going live, every calculator goes through: an automated test suite (run on every code change, in our continuous integration), a manual, independent recalculation of at least one result (spreadsheet, separate calculation script, or reference source), and a content review to rule out any generic or approximate claim.

In the interest of honesty: today, the writing and this verification are both done by the same person (Thierno Sadou Diallo, the site's founder). The word "verified" on a calculator therefore refers to this method — a recalculation by a means independent of the formula itself, compared against an official source when the topic allows it — not a second person reviewing the work. If a qualified professional reviews a calculator one day, they will be credited as a reviewer directly on that page.

3. Calculation precision

Calculations run at full numeric precision; rounding only happens at display time, never between two steps of the same calculation. This avoids the discrepancies of a few cents that can appear when rounding too early.

4. Estimates, not professional advice

This site's financial, tax, and health calculators provide estimates for informational purposes. They don't replace the advice of a qualified professional (financial advisor, accountant, healthcare professional).

5. Content freshness

Every calculator displays its last verification date. A detected error is fixed as soon as possible; the publication and verification dates shown are real, never backdated.