What Grade Is 90 out of 100?
90 out of 100 is 90% — an A- on the standard US scale, an excellent score.
- Percentage90%
- Letter gradeA-
- Missed10 pts
- For an A (90%)90/100
Score breakdown for a 100-point test
| Score | Percent | Letter |
|---|---|---|
| 90/100 | 90% | A- |
| 80/100 | 80% | B- |
| 70/100 | 70% | C- |
| 90/100 | 90% | A- |
How this is calculated
Divide the points earned by the points possible and multiply by 100: 90 ÷ 100 × 100 = 90%. On the common 10-point-band scale that lands in the A- range.
Common questions
Do these calculators store my grades?
No. Everything is computed in your browser the moment you press Calculate — nothing is uploaded, saved or seen by anyone else. Refresh the page and it's gone.
What's the difference between weighted and unweighted averages?
An unweighted average treats every score equally: add them up, divide by the count. A weighted average multiplies each category by its share of the grade first — homework 20%, midterms 40%, final 40% — which is how most courses actually work. If your syllabus lists category percentages, you need the weighted version.