CalcFi

CalcFi is a collection of more than 300 free calculators designed to make everyday money decisions easier to work out. It covers pay, taxes, mortgages, debt, investing and retirement, and shows the formulas behind each result so you can see how the numbers were reached.

The site bases its calculations on publicly available US data from sources like the Federal Reserve, IRS, U.S. Treasury, Social Security Administration and Bureau of Labor Statistics, and it displays live indicators such as mortgage rates, federal funds rates, CPI and unemployment to add context to the outputs.

Tools are grouped into clear categories and the service lets you follow paths for common situations — for example, buying a home, filing taxes, repaying debt, planning retirement or running a small business — so you only see the calculators that matter to you.

CalcFi is free to use with no sign-up or paywall, and it’s supported by optional ads. The official site is https://calcfi.app/.