Grade Percentage Calculator
Technical Calculation Methodology and Tool
Interactive Grade Percentage Calculator
Calculate your percentage grade, letter grade, or the score you need to reach a target grade.
Grade Percentage Calculator
Calculate your grade, or find the score you need to pass
📹 Video Walkthrough — Grade Percentage Calculator
You got your exam back — now you need to know if that raw score is a B or a C, and whether you still have a shot at passing the course. Use this Grade Percentage Calculator to calculate your percentage grade and letter grade using your score and total points, or flip to target mode to find exactly how many points you need on the final. It matters in high school, college, and any graded training program where the pass threshold is non-negotiable. This page includes the formula, worked examples, a results table, theory on how grade scales work, and an FAQ.
What is a grade percentage?
A grade percentage is your score expressed as a fraction of the total points available, converted to a number out of 100. It lets you compare performance across different assessments — a 38/50 and a 76/100 are both 76%, so the performance is identical regardless of how many points were on the test.
Simple Explanation
Think of it like filling a tank. If the tank holds 50 litres and you put in 38, you've filled it 76% of the way. Your score works the same way — divide what you got by the maximum possible, multiply by 100, and that's your percentage. The letter grade just puts a label on where that number lands.
How to Use This Calculator
- Choose What's My Grade? to calculate your percentage and letter grade from a score, or choose What Score Do I Need? to find the points required to hit a target.
- Enter your score in the Your Score field (or your target percentage if using target mode).
- Enter the Total Points Possible for the assignment or exam — and optionally, any points already earned.
- Click Calculate to see your result.
How Grade Percentages Work
A grade percentage is your score expressed as a proportion of the total marks available. It allows fair comparison across different assessments regardless of the maximum points used.
For example, 38 out of 50 and 76 out of 100 both equal 76%. That means the performance is equivalent even though the raw scores are different.
The Grade Percentage Formula
Use the formula below to calculate your grade percentage.
Simple Example
Score: 38 | Total points: 50
38 ÷ 50 = 0.76 → 0.76 × 100 = 76%
Result: 76% — Letter grade: C
Step-by-Step Calculation
- Take the score achieved.
- Divide it by the total points possible.
- Multiply by 100 to convert the decimal into a percentage.
- Match the result to the grade scale to find the letter grade.
Worked Examples
You scored 38 out of 50. What is your grade?
76% — Letter grade: C.
You have 210 out of 300 points. You need 70% to pass. 100 points remain in the final exam. How many do you need?
You need 70 out of the remaining 100 points.
You scored 17 out of 20. What letter grade is that?
85% — Letter grade: B.
You scored 92 out of 100. What is your letter grade?
92% — Letter grade: A.
Results Table
| Score | Total | Percentage | Letter Grade |
|---|---|---|---|
| 38 | 50 | 76% | C |
| 17 | 20 | 85% | B |
| 42 | 60 | 70% | C |
| 92 | 100 | 92% | A |
Standard US Letter Grade Scale
- A: 90–100% — Excellent
- B: 80–89% — Above average
- C: 70–79% — Average
- D: 60–69% — Below average, passing in many systems
- F: Below 60% — Failing
Common Mistakes to Avoid
- Confusing weighted and unweighted grades: If assessments carry different weights, a simple percentage may not match the true course grade.
- Using the wrong total: Always divide by the total for that assignment, quiz, or exam.
- Rounding too early: Keep the decimal during calculation and round only the final answer.
- Ignoring grading policy differences: Some schools use plus/minus scales or custom cutoffs.
Quick Answers
What grade is 38 out of 50? 76%, which is a C.
What grade is 17 out of 20? 85%, which is a B.
What grade is 42 out of 60? 70%, which is a C.
What grade is 92 out of 100? 92%, which is an A.