Study Physics Formulas (studyphysicsformulas.com) provides physics formulas, explanations and worked examples for study and revision. We check every page carefully, but courses and exam boards sometimes use different symbols, sign conventions or rounding. Always follow your teacher, your syllabus and the official exam materials where they differ from this site.
Formula sheet pages are study summaries. Official formula sheets are published by the exam boards. Calculators are learning aids; check important results by hand.