Calchorus

Calchorus is a free collection of US financial calculators covering mortgages, cash-out refinancing, 15-vs-30-year loans, self-employment tax, 1099 and quarterly estimated payments, Roth IRA limits, and CD rate comparisons. Instead of dumping a single number on you, every calculator walks through the math step by step, so you can check the assumptions and see exactly where the result comes from. There is no signup, no email wall and no paywall: open a page and get an answer in seconds. Rates and tax figures come from public sources, and each page shows its own tax year and data date.