Editorial standards

These standards apply to every calculator, guide and dataset on CalculatorHub. They are enforced in our build, not just stated here.

Accuracy

Where a calculator depends on an external rate, figure or dataset, that value is sourced to the authority responsible for it and recorded with its date, or it is a market-variable input you enter yourself with a clearly labelled default. We never assert a real-world figure we cannot confirm against a primary source.

Primary and authoritative sources, chosen to suit the subject

CalculatorHub prioritises primary and authoritative sources appropriate to the subject, including legislation, government publications, recognised standards, peer-reviewed research and established mathematical methods. Statutory rates and public data come from the responsible authority, such as the IRS, the Social Security Administration, state departments of revenue, the Bureau of Labor Statistics or the Federal Reserve. Scientific, medical and engineering formulas are attributed to the research paper or standard that defines them, not to an organisation that merely publishes related material or defines the units involved. Pure mathematical identities are documented and independently tested rather than attributed to an outside authority. We do not take figures, formulae or wording from other calculator or commercial websites.

Unconfirmed figures are labelled or held

If a figure cannot be confirmed, we either keep it as a clearly labelled, editable field with a note to check the current figure with the authority, or we hold the page rather than publish a guess. "We do not know yet" is an acceptable, honest answer; a confident wrong number is not.

Original work

Every tool is built from first principles. We derive each formula from the official rule, implement it ourselves, write the explanation in our own words, and use our own worked examples. Nothing is copied from competitors.

Verification

Each tool ships with a worked example that runs as an automated test, so the visible maths and the code can never silently diverge. Formulae are checked across edge cases, and figures are re-verified whenever a source changes.

Provenance and review

Each figure-bearing page shows its official sources, the date each figure is current as at, and the date a human last reviewed it. Tools are reviewed by James Graham, editor; jurisdiction-specific review expands as the site grows.

Localisation

Non-English and country-specific content is localised for the local rules, currency, number formatting, spelling and terminology, and each localised page runs the same worked-example tests as the English original, so it is more than a raw text translation.

Corrections

If you spot an error, email contact@calculatorhub.com. We check the report against the official source and correct it promptly, and significant figure changes are recorded in our public change history.

CalculatorHub provides general information, not financial, tax, legal or investment advice.