LESS BUSYWORK. MORE TEACHING.
Common U.S. scales, with the details that matter at the boundaries.
A grading scale maps a percentage to a letter grade. A common U.S. standard uses A at 90%, B at 80%, C at 70%, D at 60%, and F below 60%. Plus/minus thresholds and rounding rules vary, so follow your syllabus.
Example: 80.8% is B on the standard scale shown here, but B− on the illustrated plus/minus scale.
THE STANDARD SCALE
| Grade | Percentage | Reference GPA |
|---|---|---|
| A | 90 ≤ score ≤ 100% | 4.0 |
| B | 80 ≤ score < 90% | 3.0 |
| C | 70 ≤ score < 80% | 2.0 |
| D | 60 ≤ score < 70% | 1.0 |
| F | 0 ≤ score < 60% | 0.0 |
These are common reference values. A letter grade is not a complete GPA calculation.
WHEN THE DETAILS COUNT
| Grade | Percentage | GPA |
|---|---|---|
| A | 93–100% | 4.0 |
| A- | 90 ≤ score < 93% | 3.7 |
| B+ | 87 ≤ score < 90% | 3.3 |
| B | 83 ≤ score < 87% | 3.0 |
| B- | 80 ≤ score < 83% | 2.7 |
| C+ | 77 ≤ score < 80% | 2.3 |
| C | 73 ≤ score < 77% | 2.0 |
| C- | 70 ≤ score < 73% | 1.7 |
| D+ | 67 ≤ score < 70% | 1.3 |
| D | 63 ≤ score < 67% | 1.0 |
| D- | 60 ≤ score < 63% | 0.7 |
| F | 0 ≤ score < 60% | 0.0 |
Instructors and schools set their own thresholds. Some use 90% for an A; others use 93%. Some use plus/minus grades or a different passing score. Your syllabus is the source of truth.
Our calculators use the original percentage to assign a letter grade. A displayed 90% that comes from 89.999% is still below an A on the standard scale. Apply a school’s rounding policy separately if it differs.
A GPA usually combines course grade points weighted by credits. Honors and AP policies may add weight. The tables above show reference conversions, not a universal GPA policy.
Calculate your course grade →WHO IT HELPS & HOW TO USE IT
For students and teachers checking letter boundaries and illustrative grade-point values.
Before you rely on the result: These are reference scales, not a school policy. Grade-point values are illustrative; this site does not currently calculate a credit-weighted or cumulative GPA.
Calculation methods, rounding & data handling →UNDERSTAND YOUR RESULT
The tables above compare common U.S. standard and plus/minus grading policies. Your school’s published policy takes priority: an A may begin at 90% in one course and 93% in another.
A displayed percentage may round up while its underlying value stays below a letter boundary. Decide whether your instructor rounds before comparing a score with the threshold.
GPA values are reference values for a single letter grade. A cumulative GPA also depends on course credits, repeated-course rules, and any honors weighting used by your institution.
GOOD QUESTIONS. STRAIGHT ANSWERS.
Use the scale in your syllabus or school handbook. These tables show common U.S. examples, not a universal standard.
Under a 90% A threshold without rounding, no. Our calculators assign letters before display rounding. Your instructor may have a different rounding policy.
A percentage alone does not determine your overall GPA. A letter grade can have a reference grade-point value, but an overall GPA also needs course credits and your institution’s weighting policy.