What every page includes
A working calculator, a plain-language purpose, the formula, essential assumptions and related tools. Longer explanations are kept only when they improve the decision.
What we avoid
We do not publish copied explanations, invented expert quotes, fake ratings, unsupported performance claims or pages that differ only by a keyword.
Review dates
A formula verification date appears on each calculator. Dates reflect an actual review and are updated only when the page is checked again.
Commercial independence
Commercial relationships, if introduced, will not change calculator formulas. Paid placements will be labelled and governed by the affiliate disclosure.