Convert marks into a percentage, or work out how many marks you need to hit a target grade — with a US letter grade and GPA reference table.
This is a common US letter grade and GPA scale, provided for general guidance only — exact cutoffs and GPA weightings vary by school, district, and state, and some institutions use different scales entirely (e.g. plus/minus grades, or no D- grade).
| Letter grade | Percentage | GPA |
|---|---|---|
| A | 93% – 100% | 4.0 |
| A- | 90% – 92% | 3.7 |
| B+ | 87% – 89% | 3.3 |
| B | 83% – 86% | 3.0 |
| B- | 80% – 82% | 2.7 |
| C+ | 77% – 79% | 2.3 |
| C | 73% – 76% | 2.0 |
| C- | 70% – 72% | 1.7 |
| D+ | 67% – 69% | 1.3 |
| D | 63% – 66% | 1.0 |
| D- | 60% – 62% | 0.7 |
| F | Below 60% | 0.0 |
This scale reflects a common convention used by many US high schools and colleges. Some institutions don't use plus/minus grades, use different percentage cutoffs, or weight GPA differently (e.g. for honors/AP courses) — check your school's grading policy for the figures that apply to you.
Use the calculator above to convert raw marks into a percentage, or to work out the marks needed for a target grade — then use the table to see roughly which letter grade and GPA value that percentage corresponds to.
Unlike some national exam systems, there's no single official US grading scale — each school, district, or state sets its own percentage cutoffs for letter grades and its own GPA weightings. The table on this page reflects a commonly used scale, but yours may differ slightly, especially around the boundaries between grades.
GPA (Grade Point Average) converts letter grades into a numeric scale, typically 0.0–4.0, which is then averaged across all your courses. Some schools use a weighted scale that gives extra points for honors, AP, or IB courses (e.g. up to 5.0), so a single percentage doesn't always map to the same GPA value everywhere.
Switch to "Percentage → Marks needed" mode, enter the percentage cutoff for the grade you're aiming for (using the table as a guide) and the total marks available for the assignment or exam. The calculator rounds up to the nearest whole mark, since most assignments don't award fractional marks.