Processing follows the tool's documented local or protected execution boundary.
Use this calculator when you have a list of scores and want a clear average. Leave weights empty when each score counts equally. Add one weight per score when an assessment has a different influence. The result also includes a letter grade, the highest score, and the lowest score according to this tool's display rules.
The result is a calculation from the values you enter. Compare it with your syllabus before using it as an official course grade. A school may drop an assignment, apply extra credit, use another scale, or round at a different point. This page does not calculate a required future exam score.
A simple average adds all parsed scores and divides by their count. Every score therefore has equal influence. A weighted average multiplies each score by the weight on the same line, adds the products, and divides by the total weight. The weights do not have to add to 100; their relative sizes determine influence.
The current processor uses weights only when the parsed number of weights matches the parsed number of grades and at least one weight is positive. If the lists have different lengths, it falls back to a simple average. It does not guess a missing weight or silently align the remaining rows for you.
The average summarizes the parsed scores in this run. The highest and lowest values help you spot an unexpected entry, but they do not prove that every score uses the right scale or that your school accepts the displayed letter.
For a weighted result, reconstruct the products if the answer looks surprising. A weight moved to another line changes the assessment it affects, even when the total weight stays the same.
Three grades and two weights trigger the simple-average fallback. Count both lists before trusting a weighted interpretation.
Do not combine scores out of 20 with scores out of 100 without a documented conversion. Do not treat the A–F thresholds as your institution's official policy.
The calculator does not know dropped assignments, extra credit, retakes, missing assessments, or a target final grade. It calculates the values supplied in the current run.
Input parsing can depend on numeric format. Use clear numeric lines and test a short sample before relying on a long pasted list.
sum(scores) / count(scores)This is used when no usable matching weight list is supplied. A blank or malformed line may change the parsed count, so keep the raw list clean.
sum(score_i × weight_i) / sum(weight_i)The position matters. Weight three affects score three. The denominator is the total weight, and the total must be positive for the weighted path.
The current display rule is A from 90, B from 80, C from 70, D from 60, and F below 60. This is a tool rule rather than a universal academic grading policy.
The displayed average is rounded for presentation. Recalculate with the original values if a rounding difference matters.
What is the average of 90, 85, and 100 without weights?
90 85 100
The average is 91.67 and the displayed letter is A.
Each score contributes equally.
What happens with weights 1, 1, and 1?
90 85 100
1 1 1
The result remains 91.67 and A.
Equal positive weights preserve equal influence.
What is the result when 100 has weight 2?
90 85 100
1 1 2
The weighted average is 93.75 and the letter is A.
The highest score has more influence, so the average rises.
Can decimal weights represent different influence?
72 88
0.5 1.5
The result is 84 and B.
The second score has three times the influence of the first.
What does a single score of 76 produce?
76
2
The average is 76 and the letter is C.
A weight cannot change the average of one included score.
What if three grades have only two weights?
90 85 100
1 1
The displayed result is the simple average, 91.67 and A.
This result is not weighted. Add the missing weight when unequal influence is intended.
Leave it empty when every entered grade should count equally.
No. The calculation divides by the total weight, so proportional lists give the same result.
The current implementation uses the simple average when the parsed list lengths differ.
Your school may use other weights, exclusions, rounding, or letter thresholds.
No. There is no target-score or future-exam input in this tool.
The weighted and simple averages are equal because every score has equal influence.
No. The tool shows A from 90, but institutions can use different thresholds.
They can reveal a typo or a score on another scale, though they do not validate the full list.
Processing follows the tool's documented local or protected execution boundary.
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