Education Calculations
Grades, GPA and study metrics explained so students can verify the result by hand.
7 calculations published in this category.
Statistics
Grades
How To Calculate A Test Score
A test score is the marks you earned divided by the marks available. The arithmetic is one division, but the answer is reported in three different currencies: the raw mark, the percentage, and the letter grade. Only the first two are yours to compute.
Percentage score = (correct / total) x 100
How To Calculate A Weighted GPA
A weighted GPA on the school scale adds bonus points to difficult courses before averaging, so an AP A counts as 5.0 and an honours A as 4.5 rather than 4.0. The arithmetic is trivial; the difficulty is keeping this weighting distinct from the credit weighting used elsewhere, and knowing which figure a reader actually wants.
Weighted GPA = Sum of (grade points + bonus) / number of courses
How To Calculate GPA
A grade point average is a credit-weighted average of grade points, not an average of letter grades. Every difficulty with it comes down to two things: which grade point table applies to you, and whether the credits were actually used as weights.
GPA = Sum of (grade points x credits) / Sum of credits
How To Calculate The Grade You Need On The Final
The grade you need on the final is not a percentage to aim for but an unknown inside a weighted average. Solve it directly and a comfortable-looking target can turn out to be arithmetically impossible.
Needed on final = (Target - Current x (1 - Final weight)) / Final weight