Calchorus publishes free, fast, privacy-first financial calculators — for self-employment taxes, mortgages, debt payoff, retirement and everyday money math.
Every calculator runs entirely in your browser. The numbers you type are never uploaded, stored, or shared — close the tab and they are gone. There is no account, no sign-up, and no paywall.
Each tool documents its formula in plain English and links to the official sources it is based on (for example IRS publications for tax tools). Rates and rules are reviewed and date-stamped on each page.
Our results are estimates for informational purposes only. They are not financial, tax, or legal advice. For decisions that matter, verify with the IRS or a licensed professional.
Found an error or have a calculator request? Email us at 26839101@qq.com.