Why we built this
Grades run on simple maths, but it's easy to lose track once points, category weights, and credit hours pile up. ExamTally puts the everyday math students and teachers actually use — marking a test, totalling a GPA, or working out the exact score you need on the final — in one tidy place, on the scales and formulas US classrooms recognise. No account, no fees, and nothing you type leaves your browser.
How we calculate
Every tool uses standard grading formulas and the common US scale. The table below documents the core method and key assumptions behind each calculator category, so you can see exactly what a result represents. The calculators run entirely in your browser in plain JavaScript — nothing you type is sent to a server or stored.
| Category | Core method | Key assumptions |
|---|---|---|
| Scoring & tests Easy Grader, Test Grade, Percentage Grade, Points Grade, Grade Curve | Score % = points earned ÷ points possible × 100 (or correct ÷ total × 100). Points-grade sums several earned/possible items first. Curves lift a raw score by flat add, square-root (10 × √raw), or top-score scaling (raw × 100 ÷ class high). | The percentage is exact arithmetic; the letter depends on the cutoff scale below. Scores are rounded to one decimal. Curve choice changes the result, and a curve never lowers a score. |
| Final & semester Final Grade, Semester Grade, Weighted Grade, Average Grade | Weighted grade = Σ(grade × weight) ÷ Σweight. Needed final = (target − current × (1 − weight)) ÷ weight. Average = mean of grades (optionally weighted). Semester combines category grades by their weights into one overall percent. | Weights are entered as percentages of the grade; the final-needed result is flagged when it exceeds 100% (impossible). Confirm your course's exact category weights in the syllabus. |
| GPA GPA, Weighted GPA, High School GPA | GPA = Σ(grade points × credit hours) ÷ Σcredit hours on the 4.0 scale. Weighted GPA adds a bonus before averaging: +0.5 for Honors, +1.0 for AP/IB. Cumulative GPA applies the same formula across all terms. | Grade points: A = 4, B = 3, C = 2, D = 1, F = 0. Plus/minus point values and Honors/AP bonus amounts vary by school. Cumulative GPA sums all quality points and credits — it is not an average of semester GPAs. |
The default scale we use
Unless a tool lets you change it, ExamTally uses the most common US letter scale and 4.0 GPA points:
| Letter | Percentage | GPA points (4.0) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
Confirm your school's official scale. Many schools and districts use plus/minus grades, shifted cutoffs, or different GPA point values, and weight Honors and AP classes their own way. Treat every result here as an estimate and check it against your teacher, syllabus, or registrar.
Sources & how we keep this accurate
The percentage, weighted-average, final-needed, and GPA formulas are standard arithmetic used throughout US grading. The A–F bands and 4.0 grade points reflect the most common US scale; the +0.5 Honors / +1.0 AP weighting and the flat/square-root/top-score curve methods follow widely used conventions. Each calculator and guide carries its own cited note and a review date, and we revisit the formulas periodically. Spotted a number that looks off? Tell us on the contact page.
Methodology last reviewed 2026-06-28
What this is not
ExamTally gives educational estimates to help you check grades and plan. It is not official record-keeping or academic advice. Grading scales, category weights, rounding rules, and GPA policies vary by school and district — always confirm your class's official scale with your teacher, syllabus, or registrar before relying on a result.
Get in touch
Want a calculator we don't have yet, or spot a result that looks wrong? Reach us on the contact page, or start with the guides to see the math behind each tool.