About CorrectCalc

Why this site exists

Most financial calculators ask you to trust a black box: a number appears, but you can't see where it came from. CorrectCalc takes the opposite approach. Every result shows its formula, its assumptions and a worked example — and every data input, from tax brackets to rate context, names its official source.

The name is the promise: correct calculations. Each formula in our calculation engine is tested against official worked examples — the CFPB's loan tools, the SEC's compound interest calculator, IRS publications — before it ships, and re-verified quarterly.

How we stay accurate

• Official sources. Rates, brackets and limits come from institutions like the IRS, Freddie Mac and the CFPB — never scraped guesses.
• Cross-verification. Formulas are tested against published official examples with automated checks on every code change. If the math breaks, the site doesn't build.
• Quarterly review. Data files carry effective dates and are reviewed quarterly — sooner when rules change.
• Transparency by default. Every calculator page documents its assumptions, and an "How this is calculated" section shows the exact formula used.

What we are not

CorrectCalc is a planning tool, not financial, tax or legal advice. Results are estimates; your actual numbers depend on your lender, your jurisdiction and your circumstances. For decisions with real money on the line, confirm with a qualified professional.

Privacy stance

All calculators run in your browser. We never see the numbers you enter. See the Privacy Policy for details.

Contact

Found a calculation that looks wrong? That's exactly the kind of report we want. Email [email protected] — every calculator page also has a feedback path, and math corrections ship fast.