Test Grade Calculator Calculators

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A test grade calculator converts raw scores to percentages, letter grades, and GPA points. The basic formula is: Score % = (points earned / total points possible) × 100. US letter grade scales typically use: A = 90–100%, B = 80–89%, C = 70–79%, D = 60–69%, F = below 60% (thresholds vary by institution). Weighted grade calculations account for the different weight of assignments, quizzes, and exams in a course's final grade. GPA conversion assigns numeric points to letter grades for computing cumulative academic performance.

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Score Percentage Formula

Score % = (points earned / total points possible) × 100

Example: 43/50 on a test: score = (43/50) × 100 = 86%.

Letter Grade Scale (Common US)

A+97–100%
A93–96%
A−90–92%
B+87–89%
B83–86%
B−80–82%
C+77–79%
C73–76%
C−70–72%
D60–69%
Fbelow 60%

GPA Points Conversion

A = 4.0; A− = 3.7; B+ = 3.3; B = 3.0; B− = 2.7; C+ = 2.3; C = 2.0; C− = 1.7; D = 1.0; F = 0. GPA = Σ(grade points × credit hours) / Σ(credit hours).

Weighted Grade Calculation

Final grade = Σ(category score × category weight). Example: homework (20%): 85; midterm (30%): 78; final (50%): 82. Final = (85×0.20) + (78×0.30) + (82×0.50) = 17 + 23.4 + 41 = 81.4%.

Glossary

Score Percentage
(Points earned / points possible) × 100; converts raw scores to a 0–100% scale; basis for letter grade assignment.
Weighted Grade
Final course grade calculated as Σ(component score × component weight); weights must sum to 100%; reflects the relative importance of different assessments.
GPA (Grade Point Average)
Σ(quality points × credit hours) / total credit hours; A = 4.0 points; measures cumulative academic performance on a 0–4.0 scale.

Frequently Asked Questions

Score % = (points earned / points possible) × 100. Example: 38 out of 50 = (38/50) × 100 = 76%. For partial credit or fractional points: same formula applies. To convert to letter grade: look up your school's scale (common US: 90–100 = A; 80–89 = B; 70–79 = C; 60–69 = D; below 60 = F). Note that scales vary significantly — some schools use 93–100 for A; others use 90–100. Always check your syllabus for the exact scale used.

Weighted final grade = Σ(each component's percentage score × its weight as a decimal). Example: quizzes (15% weight) average 88%; labs (20%) average 92%; midterm (25%) 79%; final (40%) 84%. Final grade = (88×0.15) + (92×0.20) + (79×0.25) + (84×0.40) = 13.2 + 18.4 + 19.75 + 33.6 = 84.95%. Make sure all weights sum to 1.0 (100%) — if they don't, normalize first. Most course management systems (Canvas, Blackboard) calculate this automatically.

GPA = Σ(quality points × credit hours) / total credit hours. Quality points: A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, C+ = 2.3, C = 2.0, D = 1.0, F = 0. Example: 3 credit Biology (B+ = 3.3): 9.9 quality points; 4 credit Chemistry (A− = 3.7): 14.8 points; 3 credit Math (B = 3.0): 9.0 points. GPA = (9.9+14.8+9.0)/(3+4+3) = 33.7/10 = 3.37. Semester GPA uses only current semester courses; cumulative GPA uses all completed coursework.

A grade curve adjusts raw scores upward when a test was too difficult or class performance was below expected. Common curve methods: (1) Add a fixed number of points to all scores (e.g., add 10 points). (2) Scale to the highest score: new score = (raw score / highest score) × 100. (3) Adjust so a specific percentile earns a specific grade (e.g., the 60th percentile earns a C). (4) Standard deviation curve: set mean = 75% ± 10% SD bands for grade boundaries. Curving typically raises all scores proportionally, but the relative ranking of students remains the same.