Sources we use
We rely on primary sources: College Board and ACT score reports, scoring guides, course and exam descriptions and practice-test materials; state education laws and grading policies; and university registrar and admissions pages. We do not use test-prep companies, forums or social media as sources of fact.
How calculators are checked
Every calculator uses published, standard formulas. The code is covered by automated tests that check known answers (for example, a current grade of 88% with a final worth 25% needs a 56% on the final to finish at 80%, and A− = 3.7 grade points on a 4.0 scale). We show the formula next to each tool so anyone can verify the result by hand.
What we will not publish
- Paid placements or reviews written for a tutoring or test-prep company.
- Questions or answers from secure, unreleased exams.
- Score “predictions” presented as official results.
- Claims we cannot support with a source.
Updates and corrections
Each page shows the date it was last updated. When College Board, ACT or a school system changes a test format, a scoring table or a grading policy, we update the affected pages. If you find an error, tell us through the contact page and we will review it and correct it.