FlareLodge is a set of 26 free calculators for mortgages, loans, savings, retirement, health, dates and everyday math. Each page shows the formula, explains the result in plain words, works through examples and links its sources (CFPB, Federal Reserve, Freddie Mac, CDC). Calculations run in the browser and there is no sign-up. It also publishes open data tables with CSV downloads under CC BY 4.0. Disclosure: I run the site.

FlareLodge

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