Education calculator
Grade Calculator
Enter your current grade and target to find the final exam score you need, or calculate your weighted average across all assignments and categories.
Score needed on final exam
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How the grade calculator works
The grade calculator has two modes: find the score you need on your final exam to reach a target grade, or calculate your weighted average across multiple assignments and categories.
In final grade mode, you enter your current grade, your desired overall grade, and the weight of the final exam as a percentage. The calculator tells you exactly what score you need.
In weighted average mode, you enter your assignment scores and weights, and the calculator computes your weighted average and letter grade using the standard A–F scale.
Final grade formula
In the final grade formula, the weight is expressed as a decimal. For example, if your final exam is worth 25%, that's a weight of 0.25. Your current grade contributes to the weighted average by its own percentage (75% in this case), so we subtract that contribution from your desired grade and divide by the remaining weight.
Example: If you have an 88 and want a 90, with a final exam worth 25%, you need (90 − 88 × 0.75) ÷ 0.25 = (90 − 66) ÷ 0.25 = 24 ÷ 0.25 = 96 on the final.
Another example: If you have a 75 and want an 80, with a final exam worth 40%, you need (80 − 75 × 0.6) ÷ 0.4 = (80 − 45) ÷ 0.4 = 35 ÷ 0.4 = 87.5 on the final.
In the weighted average formula, you can use any consistent weights—percentages or points. The calculator normalizes by the total, so 90 with weight 20, 85 with weight 30, and 78 with weight 50 gives (90 × 20 + 85 × 30 + 78 × 50) ÷ (20 + 30 + 50) = (1800 + 2550 + 3900) ÷ 100 = 82.5.
When the needed score is above 100%
If the final grade calculator shows a score above 100%, it means you cannot reach your desired grade without extra credit or other adjustments. This happens when the gap between your current grade and your goal is too large for the final exam's weight to bridge.
If you see this result, consider: checking your syllabus for extra credit opportunities, adjusting your target grade to a more realistic level, or verifying the weight of the final exam.
Percentage weights versus points
The weighted average calculator works with any consistent weight system. You can use percentages (where the total adds up to 100) or points (where the total adds up to any number). Because the calculator normalizes by dividing the sum of (score × weight) by the sum of weights, the unit doesn't matter—only the relative proportions.
For example, assignments with weights 20, 30, and 50 give the same result as 2, 3, and 5, or as 40%, 60%, and 100%. All produce the same weighted average.
Frequently asked questions
What grade do I need on my final to pass?
Use the final grade calculator: set your current grade and desired grade to your school's passing threshold (often 60%, 65%, or 70%), then enter your final exam weight. The calculator will show you the exact score you need.
How do I calculate my grade with weighted categories?
Use the weighted average mode. Add a row for each assignment or category, enter its score and weight (either as a percentage or in points), and the calculator will compute your overall grade. Rows with zero or blank weights are skipped.
What if my final exam is worth more than 100 points?
Enter its weight, not the raw point total. If your final is worth 50 points but the rest of your grade is built on 100 points, the final is worth 50 ÷ 150 ≈ 33%. Use that weight, not 50.
What letter grade is an 82.5?
Using the standard scale shown in the calculator, 82.5 falls in the B− range (80–82.9). However, letter grade scales vary by school, so check your syllabus. Some schools use 85 as the B threshold; others use 80.
Does this include extra credit?
This calculator shows your grade based on submitted assignments only. If you have earned extra credit, add it to your current score first, then recalculate.