# My Grade Calculator: grading scales and formulas, one per line
# Source: our own method, explained at https://mygradecalculator.app/how-we-calculate/ (checked 2026-10-07). Schools set their own rules; a teacher's gradebook is the final word.
# Format: kind | name | rule and example | page
Scale | 10-point scale | A 90 to 100; B 80 to 89.99; C 70 to 79.99; D 60 to 69.99; F 0 to 59.99 | https://mygradecalculator.app/letter-grade-converter/
Scale | 7-point scale | A 93 to 100; B 85 to 92.99; C 77 to 84.99; D 70 to 76.99; F 0 to 69.99 | https://mygradecalculator.app/letter-grade-converter/
Scale | Plus/minus scale | A+ 97 to 100; A 93 to 96.99; A- 90 to 92.99; B+ 87 to 89.99; B 83 to 86.99; B- 80 to 82.99; C+ 77 to 79.99; C 73 to 76.99; C- 70 to 72.99; D+ 67 to 69.99; D 63 to 66.99; D- 60 to 62.99; F 0 to 59.99 | https://mygradecalculator.app/letter-grade-converter/
Rule | Rounding | With rounding on, a score is rounded half up to a whole number before the letter: 89.5 counts as 90 (A on the 10-point scale; B without rounding). | https://mygradecalculator.app/letter-grade-converter/
Rule | 4.0 grade points | A+ 4; A 4; A- 3.7; B+ 3.3; B 3; B- 2.7; C+ 2.3; C 2; C- 1.7; D+ 1.3; D 1; D- 0.7; F 0 (A+ is 4.3 at some colleges). | https://mygradecalculator.app/gpa-calculator/
Formula | Points grade | grade = points earned / points possible x 100. Example: 46/50, 18/20 and 88/100 make 152/170 = 89.41%. | https://mygradecalculator.app/
Formula | Weighted grade | grade = sum of (score x weight) / sum of weights. Dividing by the total weight scales weights that do not add to 100. Example: 90 at 30% and 80 at 50% give (2700 + 4000) / 80 = 83.75%. | https://mygradecalculator.app/weighted-grade-calculator/
Rule | Category average | In a category, points are added up and plain percents are averaged. Example: 18/20 and 45/50 make 63/70 = 90%. | https://mygradecalculator.app/weighted-grade-calculator/
Rule | Drop the lowest | Every choice is tried and the one leaving the highest grade is kept. Example: from 1/10, 30/100 and 90/100, dropping 30/100 leaves 82.73%. | https://mygradecalculator.app/
Rule | Extra credit | Points mode: added to points earned, not points possible (90/100 + 5 = 95%). Weights mode: added to the grade as percentage points. | https://mygradecalculator.app/
Formula | Final exam needed | needed = (target - current x (1 - w)) / w, with w the final's weight as a decimal. Example: 85% now, final worth 20%, target 90%: (90 - 68) / 0.2 = 110%, which is above 100% and so not possible; a target of 80% needs 60%. 0% or below means already secured. | https://mygradecalculator.app/final-grade-calculator/
Formula | Grade after the final | grade = current x (1 - w) + final x w. Example: 85% now, final worth 20%, 75% on the final: 83%. | https://mygradecalculator.app/final-grade-calculator/
Formula | Test grade | grade = (total - number wrong) / total x 100. Example: 3 wrong out of 25 = 88%. | https://mygradecalculator.app/test-grade-calculator/
Formula | EZ grader chart | One row per number wrong from 0 to the total (steps of 1, or 0.5 with half points); percent = (total - wrong) / total x 100, rounded half up to the chosen decimals; the letter follows the printed percent. Example: 20 questions, 2.5 wrong = 87.5% (B+). | https://mygradecalculator.app/ez-grader/
Formula | Unweighted GPA | GPA = sum of (grade points x credits) / total credits. Example: A in a 3-credit class and B in a 4-credit class: (12 + 12) / 7 = 3.43. | https://mygradecalculator.app/gpa-calculator/
Formula | Weighted GPA | Honors adds 0.5 and college-level adds 1.0 to a class’s grade points before multiplying by credits; never added to an F. Example: an A in a college-level class counts as 5.0. | https://mygradecalculator.app/gpa-calculator/
Formula | Cumulative GPA | Add every term's grade points and credits, plus those already earned. Example: 3.20 over 30 credits plus the 7-credit term above = 3.24. | https://mygradecalculator.app/gpa-calculator/
Formula | GPA needed next term | needed = (target x (credits so far + next credits) - grade points so far) / next credits. Example: 3.0 over 30 credits, target 3.2 after 15 more: 3.60. Above the top of the scale means not possible in one term. | https://mygradecalculator.app/gpa-calculator/