Trust & methodology

Editorial & calculation policy

Our goal is simple: show what a calculator does, expose the important assumptions, and never pretend an estimate is professional advice.

How formulas are built

Each calculator has an explicit formula or calculation method in the code. Unit converters use the defined base-unit relationship for the selected pair; nonlinear conversions such as fuel economy, temperature, and percent grade retain their actual inverse or offset formulas.

Testing and review

Before release, we run automated catalog, formula, source, metadata, accessibility, interaction, build, and production checks. High-impact changes are also checked in a real browser at mobile and desktop sizes. Known edge cases, rounding, and invalid inputs are part of the review.

Sources and changing rules

When a result depends on tax, payroll, government, or jurisdictional rules, we prefer first-party government or standards-body sources. The page identifies the applicable period and last verification date where those details are available. Users should confirm rules that can change after publication.

Corrections and limitations

Calculators provide planning estimates, not medical, legal, tax, engineering, or investment advice. If a formula, source, label, or result appears wrong, use the feedback control on that calculator page. Corrections are investigated against the implementation and any cited primary source.

No fabricated endorsements

We do not publish invented expert reviewers, testimonials, ratings, or review counts. Structured data describes the application and editorial organization without claiming credentials or user ratings that do not exist.