Weighted Grade Calculator: Turn Marks and Weightings Into One Average
ByMuhammad Ali•Founder of KruskalCode
13:23
6 min read
Teachers often combine essays, tests, and exams using different weights. A simple mean treats every piece of work equally, but a weighted average reflects what actually counts toward the module. This article explains the idea in plain language and points to a small online tool that does the arithmetic for you.
Explanation
Write down each component mark on a single scale (for example percentages 0–100). Give each component a weight that shows its share of the total (common in syllabi as 40% coursework and 60% exam). Multiply every mark by its weight and add those products. Divide that total by the sum of the weights. The result is the single number that summarises performance under that scheme.
Formula
Weighted average = Σ (mark × weight) / Σ weight, with non-negative weights and the same scale for every mark.
Example
Suppose three tasks score 82, 76, and 91 with weights 40, 35, and 25. The weighted sum is 82×40 + 76×35 + 91×25 = 8215 and the weights sum to 100, so the weighted average is 8215 ÷ 100 = 82.15. Changing all weights by the same factor would not change that value.
How to use the related calculator
Open the weighted grade calculator page. Type your marks separated by commas in the first box, then type matching weights in the same order in the second box (use 50 for half the module, 25 for a quarter, and so on). The result line shows the weighted average to two decimal places plus how many items and what total weight were used. Adjust one mark to see how it moves the overall figure.
Try the related calculator
Open toolFAQ
Is this the same as a GPA calculator?
GPA tools use credit hours and fixed point scales. Here you supply your own marks and weights, so it fits many UK module tables and informal US percentage schemes without claiming an official GPA.
What if my syllabus gives raw points out of different totals?
Convert each item to the same scale first (often a percentage), then enter those converted values and the published weights.
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About the author
Muhammad Ali. Muhammad Ali is a full-stack developer and founder of KruskalCode. He builds SaaS platforms and automation systems with React and Laravel, and helps teams ship fast, scalable tools.
Need a custom calculator, dashboard, or automation workflow? Reach out to KruskalCode.
