Open, structured data about how grades are calculated in US schools — letter grade scales, district grading policies, and the standard formulas behind weighted grades, semester grades, and "what do I need on my final" math.
Maintained by the team behind Final Grade Calculator, where this data powers a set of free, private, browser-based grade calculators.
| File | Contents |
|---|---|
data/letter-grades.json |
The standard US letter grade scale: percentage cutoffs and 4.0-scale GPA points for A+ through F |
data/district-policies.json |
Verified district grading policies (semester weights, final exam weights, category caps), each with a link to the official published source |
formulas.md |
The grade formulas implemented by our calculators, with worked examples |
- Every district entry cites its official source — a published policy page or student handbook, with the date we accessed it. No folklore.
- Cutoffs vary. The letter scale here is the most common US 4.0 mapping; individual schools and instructors set their own cutoffs and rounding rules. The syllabus always wins.
- Corrections welcome. If your district's published policy differs from an entry here, open an issue with a link to the official source and we'll fix it.
Free to use under CC BY 4.0 — use it in your app, your research, or your classroom, with attribution to final-gradecalculator.net.
See the live tools built on this data:
- Final Grade Calculator — the score you need on your final
- Grade Calculator — class grade from categories or points
- Final Exam Calculator — every final, one plan
- Weighted Grade Calculator — weighted averages done right
- Semester Grade Calculator — two terms plus a final
- University GPA policies (registrar-published grading scales, Latin honors thresholds, repeat/replacement rules)
- AP exam score-band estimates with a documented methodology
- More district semester-weight policies
Data is versioned by school year; see releases.