Test grade calculator: score to percentage and letter grade

43 out of 50 is $43 \div 50 \times 100 = 86\%$. With the common scale (A 90%+, B 80%+, C 70%+, D 60%+, F below 60%), that's a B. Many schools add + and − grades within each band, and some use different cut-offs, so check your school's grading policy.

To find the score you need for a target percentage, multiply: for 90% on a 40-point test, $0.9 \times 40 = 36$ points. For your overall grade across several tests, use a weighted average; our GPA calculator does this for letter grades across classes.

A grade is more useful when you know why you lost the points. Sort each mistake: didn't know it, careless slip, or ran out of time. Then practise the topics behind the first group. See how to use practice tests and how to study for a test.

Many teachers weight categories differently, for example tests 50%, homework 20%, quizzes 20% and participation 10%. Your overall grade is then a weighted average: if you have 82% on tests, 95% on homework, 88% on quizzes and 100% participation, your grade is $0.5(82) + 0.2(95) + 0.2(88) + 0.1(100) = 87.6\%$. Check your course syllabus for the weights your teacher uses.

Some teachers curve tests, raising everyone's score when a test turned out harder than intended. In the UK, exams like GCSEs use grade boundaries that change each year instead of fixed percentages, so a percentage on a mock paper doesn't map directly to a grade.