Contact & Corrections

Found an error? That's the email we most want to get. Tell us the page, the number you believe is wrong, and — if you have it — a link to the official source that says otherwise. Data corrections ship with the next site update, and genuine catches make the site better for everyone.

Formula disputes. If your school computes a grade differently than a calculator assumes, check the formula note printed on that calculator's page first — most differences are policy differences (your syllabus wins), not calculation errors. If the formula itself is wrong, that's a correction: see above.

Everything else — questions, suggestions, a page you wish existed: [email protected].

We're a small independent site; we read everything, and corrections get priority.