Editorial standards
The answer should be useful, traceable and clear about its limits.
Accuracy and sourcing
We separate mathematical definitions, manufacturer specifications and planning assumptions. Product-dependent values carry source links and access dates. Values awaiting verification are marked for confirmation before launch.
When we can't find a reliable source for a number, we say so on the page instead of guessing. We do not fill those gaps with invented specifications, prices or claims.
Checking a calculator
A calculator is prepared with a pure calculation function and tests for its worked examples. Checks cover rounding, unit conversion and invalid inputs. The build runs the available math tests before generating the static pages.
Read our calculation methodology for the detailed rules.
Corrections
If a result appears wrong, report the calculation and inputs. We will review the formula, source values and test case. A confirmed correction should update the calculation, its explanation and the relevant tests together.
Update dates
A page's “Last updated” date comes from its committed source history. New or uncommitted pages have no update date. The date a source was accessed is recorded separately and does not imply that a manufacturer specification is still current.
Independence and boundaries
We do not invent credentials, reviews, endorsements or user counts. Advertising is not running. Material estimates are general planning tools; they are not structural designs or professional advice.