Methodology
How the calculators are built
Calculation logic, interface, translations, sources and tests are kept separate so that each tool can be reviewed and maintained.
This page is still being configured and is not indexable.
Formulas and validation
Each calculator defines its inputs, units, formula, validation rules and rounding behavior.
Normal, boundary and invalid cases are tested.
Sources and reviews
Pages that rely on external classifications or guidance identify their sources.
A review date changes only after a meaningful methodological review.
Health tools
Health calculators provide general estimates and do not diagnose or replace a qualified professional.