By Muhammad Mansoor Haidar, owner and developer · Last updated October 25, 2026
The same scores under three letter scales
Computed with the same scales the letter grade calculator uses. Note how 91% changes letter between scales.
| Score | A–F (90/80/70/60) | Plus/minus | 7-point (93/85/77/70) |
|---|---|---|---|
| 92% | A | A- | B |
| 85% | B | B | C |
| 78% | C | C+ | D |
| 68% | D | D+ | F |
The five grading systems US schools use most
The A–F letter system is the default: A for excellent, B for good, C for satisfactory, D for passing but weak, F for failing, with cutoffs usually at 90/80/70/60. The plus/minus variant splits each letter (A-, B+, B-) so a 91 and a 99 stop sharing the same symbol. The 7-point variant, common in middle and high schools, moves A up to 93 and compresses the bands below it — the same 91% that earns an A on a 10-point scale earns a B on a 7-point one, which is why the scale matters as much as the score.
Pass/fail drops letters entirely: work either meets the bar or it does not. Credit/no credit and satisfactory/unsatisfactory are the same idea with different labels, used for electives, internships and courses where ranking students would distort the learning. The trade is information for safety: nobody can tell a strong pass from a bare pass, which is the point when the goal is trying something hard without GPA risk.
Standards-based grading: report the skill, not the average
Standards-based grading replaces one course grade with a report per learning standard: a student can be exceeding in argumentation, meeting in evidence and approaching in conventions, all in the same essay. Averages disappear, so one bad week in September stops dragging down a December grade, and retakes measure the current skill instead of the old one. It demands more from teachers — every standard needs its own scale and evidence — and it confuses readers who expect a single letter, which is why schools that adopt it usually publish a conversion guide alongside it.
The alternatives: mastery, contract, specifications, ungrading
Mastery grading lets students revise until they demonstrate the skill, with the grade reflecting the final state rather than the first attempt. Contract grading agrees the grade in advance: complete the listed work to the listed standard and the grade follows. Specifications grading (specs grading) grades bundles of work pass/fail against published specs, with the bundle chosen deciding the maximum grade. Ungrading drops grades during the course in favour of feedback and self-assessment, with a final grade negotiated or assigned at the end. All four trade simple comparability for a closer link between the grade and what the student can actually do.
How to choose a grading system
Match the system to the decision the grade must support. If the grade feeds a GPA, a transcript or a transfer, use a system with fine distinctions and published cutoffs — A–F or plus/minus — because readers need comparability. If the grade must encourage risk-taking in an elective or a first attempt at a hard skill, pass/fail protects that. If the grade must tell a student exactly what to improve, standards-based reporting beats any single letter. And whatever system you choose, publish its cutoffs before the course starts: a grading system students cannot read in advance is not a system, it is a surprise.
Worked example: one score, three letters
A student scores 91% on a test. The letter depends entirely on the school’s scale.
- A–F scale (90/80/70/60)
- A
- Plus/minus scale
- A-
- 7-point scale (93/85/77/70)
- B
Same work, three different letters. Always state the scale beside a letter grade — without it, the letter is ambiguous.
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