Convert your score to a percentage, letter grade, and GPA. Works with any point scale.
Your grade percentage is calculated by dividing points earned by total possible points, then multiplying by 100. For example, if you scored 42 out of 50 on a test: (42 ÷ 50) × 100 = 84%. This converts your raw score into a standardized percentage that can be compared across different tests and assignments.
For weighted grades, multiply each assignment's percentage by its weight, then add them together. If homework is 30% of your grade and you have 92%, and exams are 70% and you have 78%: (0.30 × 92) + (0.70 × 78) = 27.6 + 54.6 = 82.2% overall.
The 4.0 GPA scale is the standard used by most US colleges and universities. An A equals 4.0, a B equals 3.0, a C equals 2.0, a D equals 1.0, and an F equals 0.0. Plus and minus modifiers adjust by 0.3 (B+ = 3.3, B- = 2.7).
Some schools use a weighted GPA that awards extra points for AP, IB, or honors courses. An A in an AP class might count as 5.0 instead of 4.0, allowing weighted GPAs to exceed 4.0.
To calculate your cumulative GPA, multiply each course's grade points by its credit hours, sum the results, and divide by total credit hours. For example: an A (4.0) in a 3-credit course and a B (3.0) in a 4-credit course gives (4.0×3 + 3.0×4) ÷ (3+4) = 24÷7 = 3.43 GPA.
To find the minimum grade needed on a final exam, use this formula: Required = (Desired Grade − Current × (1 − Final Weight)) ÷ Final Weight. For example, if you want a 90% in the course, currently have 85%, and the final is worth 30%: (90 − 85 × 0.70) ÷ 0.30 = (90 − 59.5) ÷ 0.30 = 101.7%. In this case, you would need over 100% on the final — time to adjust your target.
This formula helps you prioritize study time across classes. If you need a 95% on one final but only a 70% on another, focus your effort accordingly.