Test Grade Calculator
Enter how many questions are on the test and how many you got right — or how many you got wrong — to see your percentage score and letter grade instantly.
Test details
Grading scale
What is a test grade calculator?
A test grade calculator turns a raw score on a quiz, exam or pop test into a percentage score and a letter grade. Instead of doing the arithmetic by hand, you enter how many questions there are and how many you got right — or, if it is easier, how many you got wrong — and the tool does the rest. The percentage is the number a teacher uses to pick a letter grade, so it is the fastest way to know where you stand. The math runs on JavaScript in your browser, so it is instant and private.
How to use
- Enter the total number of questions on the test.
- Choose whether you know your correct or incorrect answers, then enter that count.
- Pick a grading scale preset, or choose custom to set your own cut-offs.
- Click Calculate grade to see the percentage and the letter grade.
How the test grade is calculated
Percentage = (correct ÷ total) × 100 Letter grade = scale mapping of the percentage
Correct is worked out as the value you typed, or as total minus the wrong answers when you enter incorrect answers instead.
Example
With the defaults — a test of 50 questions and 42 correct — the percentage is 84.00%, which is a B on the standard scale. Break it down: 42 ÷ 50 = 0.84, and 0.84 × 100 = 84.00. If you enter 8 incorrect instead, the calculator arrives at the same answer because 50 − 8 = 42 correct.
Who is this test grade calculator for?
A test grade calculator is handy for anyone who needs a percentage-and-letter result quickly — students, teachers, parents and self-paced learners all get value from it.
- Students: check what a returned score means in percentage and letter terms.
- Teachers: convert raw test scores into percentages without doing each one by hand.
- Parents: help a child work out a quiz result and understand the letter.
- Online learners: score practice quizzes and module assessments marked out of a question count.
Letter grade scale
The default maps a percentage to a letter grade using the common scale below. Many schools add plus/minus variants — check your syllabus for the exact cut-offs.
| Percentage | Letter grade |
|---|---|
| 90–100 | A |
| 80–89 | B |
| 70–79 | C |
| 60–69 | D |
| Below 60 | F |
Common use cases
- Quick score check: turn a raw score, like 18 of 20, into a percentage right away.
- Wrong-answer entry: use incorrect-answer mode when that is the number you have.
- Different scales: compare a percentage across standard, 10-point and college cut-offs.
- Goal setting: see how many more correct answers you need for the next letter boundary.
Pro tips
- Use the count you have: enter correct or wrong answers — both give the identical percentage.
- Double-check the total: a one-question slip changes the percentage, so re-read the test length.
- Confirm the scale: a stricter threshold may call the same percentage a C, so match your own cut-offs.
- Re-run after a retake: update the numbers whenever a score changes to keep the picture current.
FAQ
What is a test grade calculator?
It converts the number of questions on a test and the number you got right (or wrong) into a percentage score and a letter grade.
How do I calculate a test grade percentage?
Divide correct answers by total questions and multiply by 100. So 42 of 50 is 42 ÷ 50 = 0.84, or 84.00%.
How do I find the percentage if I only know how many I got wrong?
Subtract the wrong answers from the total to get the correct count, then divide and multiply by 100. So 8 wrong of 50 is 84.00%.
What is the standard letter grade scale?
A 90-100, B 80-89, C 70-79, D 60-69, F below 60. Many schools add plus and minus variants, so check your syllabus.
Can I use a custom grading scale?
Yes. Choose the custom preset and enter your own A/B/C/D cut-offs, and the calculator uses those thresholds.
What if my correct answers are more than the total questions?
The result is capped at 100%. A higher count is likely a data-entry error, so double-check your numbers.
How do I calculate the percentage of a test with 50 questions?
Divide correct answers by 50 and multiply by 100. Getting 40 right is 80.00%, which is a B.
What grade is 84%?
On the standard scale 84% is a B, between 80% and 89%. Different cut-offs may map it differently, which is why a custom scale is useful.
Does entering correct or incorrect matter?
No. Both modes work out the same correct total and the same percentage and letter grade.
Is this test grade calculator free?
Yes. It runs entirely in your browser and nothing you enter is uploaded or stored.
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