Standards and methodology
Methodology
How we design, test and update calculators and their sources.
Content reviewedPolish contextClear and verifiable
Standards and methodology
What you should know
The key information is presented below in a short, scannable format.
01
Key point 1
Calculation engines are separated from their interfaces and tested with typical, boundary and invalid cases. Decimal arithmetic is used for money and rounding happens at a documented stage.
02
Key point 2
Legal, tax, medical and education parameters require a source, applicable year and review date. Unverified tools remain drafts and are excluded from the sitemap.
03
Key point 3
Calculator inputs are processed in the browser by default. Analytics events never include raw inputs or results.
Useful links
Continue exploring
Read the core pages behind the service or go directly to the tool catalogue.