📝 Grade Calculator
Enter points earned and points possible on a single test or assignment to instantly get your percentage score and standard letter grade.
Last Updated: July 10, 2026
Enter Your Score
Your Grade
📊 Standard US Letter Grade Scale
| Percentage | Letter Grade |
|---|---|
| 90% – 100% | A |
| 80% – 89% | B |
| 70% – 79% | C |
| 60% – 69% | D |
| Below 60% | F |
⚠️ Grading Scales Vary
This is a common US default scale used for reference only. Schools, districts, and countries use many different cutoffs and plus/minus systems (A-, B+, etc.) — always check your specific syllabus or institution's official grading policy.
🧮 How Your Grade Is Calculated
Percentage Score
Percentage = (Points Earned / Points Possible) × 100
Example: 87 out of 100 → (87/100) × 100 = 87%.
Letter Grade
The percentage is matched against the standard scale above (A 90–100, B 80–89, C 70–79, D 60–69, F below 60) to assign a letter grade.
Need a Weighted Final Grade Instead?
If you need to combine multiple assignments, quizzes, and exams with different weights into one overall course grade, use our Final Grade Calculator instead — this simpler tool is for a single test or assignment's percentage and letter grade only.
💡 Real-World Examples & Use Cases
Three verified single-test grade examples.
87 out of 100 points
A typical 100-point exam.
Result: 87.0% → Grade B.
45 out of 50 points
A 50-point quiz.
Result: 90.0% → Grade A.
138 out of 150 points
A 150-point midterm.
Result: 92.0% → Grade A.
🔍 People Also Ask
What is 87 out of 100 as a letter grade?
87 out of 100 is 87%, which falls in the B range (80–89%) on the standard US default scale.
Is 59/60 a passing grade?
59/60 is about 98.3%, which is an A on the standard scale — a very high score.
What's the difference between this and a weighted final grade calculator?
This tool scores a single test or assignment. A weighted final grade calculator combines multiple graded items with different weights into one overall course grade.
⚠️ Common Mistakes & Pro Tips
- Confusing this with a final/weighted grade: This tool is for a single test's percentage — use a weighted final grade calculator to combine multiple assignments with different weights.
- Assuming every school uses the same scale: Grading cutoffs vary widely — always check your syllabus or school policy before assuming A=90%.
- Forgetting extra credit can exceed 100%: A score like 105/100 is valid and shows as 105%, though your final grade may be capped by policy.
- Rounding errors: Round only your final percentage, not intermediate calculations, to avoid small discrepancies.
- Not checking plus/minus scales: Some schools use A-, B+, etc. — this calculator uses whole letter grades only as a common default.