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DecisionsCalc is an independent publisher of free money calculators built on official rules, for the United States, the United Kingdom, Ireland, Canada, Australia, New Zealand and Switzerland. Every figure names its official source and the date we read it. We carry no ads, affiliate links or sponsored content. Writers and researchers are welcome to quote our figures and use our data.

Figures you can quote

66free calculators on official rules
674published figures, each with its source and date (630 checked against the source)
22official worked examples our calculators reproduce exactly
7countries covered

Cited by AI assistants: Microsoft Copilot and its partners cited our pages about 1,400 times between 30 October and 5 November 2026, an average of 24 different pages a day (Bing Webmaster Tools, AI Performance report, read 9 November 2026).

Story angles

Rule changes we already model, each with a free calculator or guide you can link to:

Free data

All of it is free to use under CC BY 4.0: credit DecisionsCalc with a link to the page you used.

How to cite us

Source: DecisionsCalc, [page title], decisionscalc.com/[page]/, figures read [date shown on the page].

Our figures are compiled from official sources; for a figure that matters, also cite the official source we link to. They are general information, not financial advice (see our disclaimer).

Contact

For a figure we don’t publish, a breakdown by state or province, a check on how a number was compiled, or a correction: hello@decisionscalc.com. We say publicly what changed and when in our corrections log. How we work: methodology and editorial standards.