Weighted Average When Weights Do Not Total 100%
Divide by whatever the weights actually total, not by 100. Worked examples above and below 100, normalising, and when a wrong total is a real warning.
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Guides
Blog
Guides on weighted averages, grade weighting, GPA calculation, and the arithmetic behind the tool.
How to Calculate Weighted Average Portfolio Returns
Multiply each holding's return by its share of portfolio value, then add. Formula, worked example, contributions, asset classes and the measures it is not.
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How to Calculate Weighted Average Cost for Inventory
Divide total cost of goods available by total units available. Formula, COGS and ending inventory examples, periodic vs perpetual, FIFO compared.
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How to Calculate Weighted Grades and GPA
Multiply each grade by its weight for a course grade, and each grade point by its credit hours for GPA. Formulas, examples and a final exam solver.
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How to Check and Fix Weighted Average Calculation Errors
Most weighted average errors pass a range check. How to audit values, weights, products and totals, fix the mistake, and prove the corrected result.
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How to Choose the Right Weights for a Weighted Average
Choosing a weight is choosing a question. How to pick importance, quantity, value or sample weights, test them, and document them so they hold up.
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Weighted Average vs. Simple Average: The Difference
A simple average gives every value one vote. A weighted average sizes each vote. Both formulas, worked examples, and how to pick the right one.
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What Is a Weighted Average and When Should You Use It?
A weighted average lets some values count more than others. What it means, how it differs from a simple average, and exactly when to use each one.
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How to Calculate a Weighted Average: Formula & Examples
Multiply each value by its weight, add the products, then divide by the total weight. Full formula, five steps, worked examples and four error checks.
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Calculate a Weighted Average in Excel & Google Sheets
SUMPRODUCT divided by SUM works in both. Google Sheets adds AVERAGE.WEIGHTED. Full setup, worked examples, error fixes and a live practice sheet.
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Weighted vs Unweighted GPA, Explained with Numbers
Unweighted GPA caps at 4.0 and ignores course difficulty. Weighted GPA adds points for AP, IB, and Honors courses. Here is the arithmetic behind both, on the same transcript.
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How to Calculate a Weighted Average of Grades
A weighted average of grades multiplies each score by its grade weight and divides by the total weights. Here is the method, a worked course grade, and the final grade planning shortcut.
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Calculate Weighted Average Online
Every value-weight pair, one weighted average.
The weighted average calculator multiplies each value by its weight, adds the weighted sum, divides by the total of weights, and prints the weighted average beside the standard arithmetic mean. Course grades, GPA, portfolio returns, and probability distributions all run through the same 4 steps.
Open the Weighted Average Calculator