Clues in the syllabus
Choose weighted categories when the syllabus says, for example, “homework 40%, exams 60%.” Each category has its own average and a fixed share of the course. Choose the total-points calculator when it says the final score is total points earned divided by total points possible, with no independent category percentages.
One set of scores, two answers
Suppose homework has 90/100 points and exams have 70/100. Under fixed weights of homework 40% and exams 60%, the result is 90 × 0.40 + 70 × 0.60 = 78%. Under total points, the result is (90 + 70) ÷ (100 + 100) = 80%. The two methods differ because the weighting rule differs.
Now suppose homework had 90/100 and exams had 140/200. Weighted categories still give 90 × 0.40 + 70 × 0.60 = 78%. Total points become (90 + 140) ÷ (100 + 200) = 76.67%. More exam points increase the exam’s effective influence in the points method.
What to check before calculating
Look for category percentages, dropped scores, curves, extra credit, a separate final-exam rule, and how missing work is recorded. If the document is hard to search, the independent MRKCAL Tools PDF-to-text tool can extract selectable PDF text, while its image-to-text tool can recognize words from a screenshot. GradeScenario does not upload, read, or review your syllabus automatically. These are separate English-language file tools.
If rules conflict or omit crucial details, ask your instructor. A mathematical estimate cannot substitute for the course policy.