📝 Test Grade Calculator
Turn a test score into a percentage and letter grade, and see how many points can be missed for each grade.
How the Test Grade Calculator Works
Enter the total number of points (or questions) on a test and either the number you got right or the number you got wrong. The calculator shows the percentage score and the letter grade on the widely used 10-point scale: A for 90% and above, B for 80–89%, C for 70–79%, D for 60–69%, and F below 60%. Plus and minus grades are shown using the common split within each band.
Teachers often want a quick reference of how many points can be missed for each grade; the table below the result lists this for the total you entered. Grading scales differ between schools and courses, so check your syllabus if your scale is different.
Formula
Score (%) = points earned ÷ total points × 100 Points earned = total − points missed Points you can miss for grade G = total × (1 − minimum % for G ÷ 100), rounded down
How to Use It
- Enter the total points or number of questions.
- Choose whether you are entering points earned or points missed.
- Enter the number.
- Read the percentage, the letter grade, and the grading table.
Frequently Asked Questions
How do I calculate a test percentage?
Divide the points earned by the total points and multiply by 100. 42 out of 50 is 84%.
What letter grade is 85%?
On the common 10-point scale, 85% is a B (80–89%). With plus/minus grading it is often a B (83–86%).
How many questions can I miss and still get an A?
On a 90% A cutoff, you can miss 10% of the points. On a 40-question test, that is 4 questions.
Why is my school’s grade different?
Grading scales vary; some schools use a 7-point scale or different cutoffs. Use your course syllabus as the authority.
Related Glossary Terms
Related Calculators
- 📝 Final Grade Calculator — Find the score you need on your final exam to reach your target grade.
- 🎓 GPA Calculator — Calculate your semester or cumulative GPA on the standard US 4.0 scale.
- % Percentage Calculator — Three calculators in one: percentage of a number, percentage of total, and percentage change.
- 📊 Average Calculator (Mean, Median, Mode) — Get the mean, median, mode, range, and sum of any list of numbers.
Formula and content last reviewed: September 2026. All calculations run in your browser — nothing you enter is sent to or stored on our servers.
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See all →✔ Reviewed by GelirLab Editöryal Ekibi · Last reviewed: September 2026 · How we check our calculators