Standard US Grading Scale
- •A range (90-100%): A+ at 97+, A at 93-96, A- at 90-92.
- •B range (80-89%): B+ at 87-89, B at 83-86, B- at 80-82.
- •C and D ranges follow the same +/- pattern down to 60%.
- •Below 60% is an F on this scale.
The Real Problem This Solves
"I got 42 out of 50" doesn't tell you much on its own — is that a B, or closer to a B-? Doing the percentage math and then matching it to a grading scale by hand is exactly the kind of thing that's easy to get slightly wrong under exam-week pressure.
This calculator does both steps at once: the exact percentage, and the letter grade it falls into.
How the Grade Is Calculated
Percentage = (marks scored ÷ total marks) × 100. The result is then matched against the standard US 10-point scale with +/- bands.
Example: 42 out of 50 is 84.00% — a B. Drop to 38 out of 50 (76.00%) and it's a C. At 27 out of 50 (54.00%), it falls to an F — below the 60% cutoff.
| Marks Scored | Total Marks | Percentage | Letter Grade |
|---|---|---|---|
| 42 | 50 | 84.00% | B |
| 38 | 50 | 76.00% | C |
| 27 | 50 | 54.00% | F |
Frequently Asked Questions
What grading scale does this calculator use?
The standard US 10-point scale with +/- bands: A+ (97-100), A (93-96), A- (90-92), and so on down to F (below 60). This is the most commonly used scale for US schools and colleges.
My school uses percentages, not letter grades — is this still useful?
Yes — the percentage is calculated the same way regardless of grading system. If your institution uses a different letter-grade cutoff (some use 92+ for an A, for example), use the percentage figure and check it against your own school's scale.
Is this the same as the CGPA to Percentage Calculator?
No — that calculator converts an already-assigned CGPA (like 8.5 out of 10) into a percentage using your board or university's formula. This one starts from raw marks on a single test and gives you both the percentage and a US-style letter grade directly.