Test grade calculator
Getting 45 out of 50 questions right is 90%—an A. Getting 42 out of 50 is 84%—a B. Three more correct answers is the difference between letter grades. Test scores are just math: (correct ÷ total) × 100. The curve, extra credit, and grading policies are what turn percentages into grades.
Good to know
The 80/20 rule for test prep. 80% of test content comes from 20% of the material (usually core concepts and frequently tested topics). Cramming everything is inefficient. Focus on what's actually tested: past exams, study guides, homework problems. Depth on key topics beats breadth across everything.
Partial credit changes everything. This calculator assumes each question is worth equal points and is graded all-or-nothing. Real tests often have partial credit, weighting (some questions worth more), and essay/short answer sections. Use this for rough estimates or multiple-choice tests. For weighted tests, calculate each section separately and combine.
Grading scales vary by teacher and school. Some schools use 93–100% = A (strict), others use 90–100% = A (standard), others curve everything so the top 15% get As regardless of percentage. Law schools often curve to a 3.3 median. Med schools curve to protect students. This calculator shows the baseline; your actual grade depends on your teacher's policy.
Disclaimers & sources
For reference only. Grading policies vary by teacher and school.