Editorial Policy

Calculator Matters is an independent, self-funded publisher, built and maintained by a single operator who is directly accountable for the accuracy of every page. This Editorial Policy sets out the standards that every calculator and explanatory page must meet before it is published, and how we keep them accurate over time. It applies across all 7 categories — Finance, Investing, Tax, Budget & Credit, Business & Ecommerce, Math & Statistics, and Economics. For the technical detail of how we build and test the math, see our Methodology.

Who writes and reviews our content

Every calculator, formula, worked example, and explanatory article is written and edited by a person and reviewed before publishing — it is not auto-generated and published unchecked, scraped from other sites, or spun from existing pages. Where software assists with drafting or layout, a human verifies the facts, the sources, and the math against the engine before the page goes live. Because the site is independently run, the same person is directly accountable for every page and for acting on corrections.

Our editorial standards

Before a page is published, it must satisfy each of these standards. If one is missing, it does not ship:

• Formula accuracy. Every calculator is built from a documented formula based on authoritative references or standard, widely accepted conventions. We show the formula and key assumptions on the page so the method is open to inspection, never hidden.
• Independent verification. Before a calculator ships, an automated test recomputes its result with a second, independent method and fails the build on any mismatch — and downloadable workbooks are checked cell-by-cell against the on-page engine. See the Methodology for how this works.
• Worked examples. Each calculator includes at least one worked example using realistic, clearly labelled values, with intermediate steps, checked against the engine so the example and the live tool always agree.
• Original, human-written content. Every calculator page, explanation, and example is written and edited by a person and reviewed before publishing — not auto-published, scraped, or spun from other sites. Where tools help drafting, a human checks the facts and the math.
• Primary sourcing. When content depends on a factual standard — a rule, rate, or convention — we cite primary, authoritative publishers (such as the CFPB, IRS, SEC, FDIC, and BLS) and link to them. We do not cite low-quality or anonymous blogs as authorities.
• Plain language. We write to be understood by anyone, not just specialists. Technical terms are explained the first time they appear, and results come with a plain-English interpretation.
• No fabricated data. We do not invent statistics, reviews, testimonials, credentials, or dates. Figures are either entered by you, derived by a stated formula, or attributed to a named source.
• No sponsored results. Calculator outputs are never influenced by advertisers, affiliates, or sponsors. The numbers come solely from the formula — we do not adjust a result, ranking, or recommendation in exchange for payment.
• Responsible YMYL handling. Money, tax, and other consequential topics carry a category-appropriate disclaimer, clear assumptions and limitations, and language that estimates rather than advises. We never imply loan approval or professional advice.
• Accessibility. Pages use semantic headings, labelled inputs, keyboard-navigable controls, table fallbacks for charts, and respect light, dark, and system colour modes. See our Accessibility statement for details.
• Reviews and updates. When we learn that a reference value or rule has changed, we update the affected tools. Time-sensitive figures such as tax brackets carry a “last reviewed” note and a link to the official source for the current number.
• Open corrections. If you — or we — find an error in a formula, example, or result, we review it and correct the page as quickly as we can, through a documented Corrections process.

Sourcing standards

When a result or explanation depends on a factual standard — a formula, a tax rule, a financial convention, or an official figure — we link to a primary, authoritative publisher rather than another calculator site or an anonymous blog. The sources we reference most often are the Consumer Financial Protection Bureau (CFPB), the Internal Revenue Service (IRS), the U.S. SEC (Investor.gov), the Federal Deposit Insurance Corporation (FDIC), and the U.S. Bureau of Labor Statistics (BLS). Because rates and rules change, time-sensitive tools carry a review date and point to the official source for the current number.

Accuracy and verification

Accuracy is not left to a manual spot-check. Each flagship engine has an automated test that recomputes its result a second, independent way and fails the build on any mismatch; downloadable workbooks are validated cell-by-cell against the on-page engine; and a whole-catalog correctness run exercises edge cases such as a 0% rate or a very large loan. A site-validation gate confirms every published calculator resolves to a real, uniquely-titled, internally-linked page before anything deploys. The full process is documented in our Methodology.

Advertising and affiliate independence

Calculator Matters is free to use and is intended to be supported by advertising. Advertisers and affiliates have no influence over our calculator formulas, results, rankings, or editorial content, and ad placement does not affect any calculator's output. We do not accept payment to change a result or to recommend a product. See our Advertising Disclosure and Affiliate Disclosure.

What Calculator Matters is not

Calculator Matters is an educational tool, not a financial adviser, lender, broker, insurer, tax authority, or medical provider, and is not affiliated with or endorsed by any of them. Our calculators provide estimates based on the inputs you supply and standard formulas; they are not a substitute for personalised professional advice and do not determine loan approval. Please read our full Disclaimer before making decisions based on any result.

Scope

This policy applies to every public calculator and explanatory page on the site, across 7 categories — Finance, Investing, Tax, Budget & Credit, Business & Ecommerce, Math & Statistics, and Economics. Public navigation includes only calculators that meet the standards above and are ready for users; nothing is listed before it is complete and verified.

Feedback and corrections

If you believe any formula, worked example, or piece of content is incorrect, please tell us through our Corrections Policy or our contact page. We take accuracy reports seriously, review them promptly, and correct the page as quickly as we can. You can learn more about who runs the site on our About page.