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Weighted Average


The Weighted Average is a calculation that takes into account the varying degrees of importance of the numbers in a data set. In finance, it is often used when considering different financial periods or differing investments with varying amounts of significance. It provides a more accurate reflection of data by assigning weights to each individual value.


The phonetic pronunciation of “Weighted Average” is: “wey-tid av-er-ij”

Key Takeaways

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  1. The weighted average is a type of arithmetic mean where some elements contribute more than others. If all items are equally important, every item would be weighted equally and it would just be a simple average. But if some items are considered more important than others, a weighted average assigns more significance to those items.
  2. Weighted averages are used in a multitude of disciplines including finance, economics, statistics, and data analysis. For example, in finance, the weighted average might be used to calculate the portfolio return or risk, factoring in the percentage each component investment contributes to the total portfolio.
  3. The formula for calculating the weighted average is the sum of every value times its weight, divided by the sum of all weights. This ensures that each element is taken into account proportionately, according to its weightage.

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The business/finance term “weighted average” is integral because it provides a more accurate representation of data sets where certain elements carry more importance or relevance than others. In business and finance, this concept applies to various aspects such as calculating the average returns on portfolio where various investments have different proportions, deriving the average cost of capital where different sources of capital carry different weights, or performing financial analyses like inventory assessments where certain items have more value. By assigning varying weights to these diverse factors, the weighted average gives businesses a more precise reflection of their financial status, thereby enabling better decision-making and performance evaluation.


The chief purpose of a Weighted Average calculation in finance and business is to generate a more precise reflection and understanding of various types of data by assigning different levels of importance or ‘weight’ to certain elements. By considering how significant certain values are, the weighted average factors in their relative importance to the overall outcome. This method is particular beneficial when dealing with investment portfolios, supply chain management or determining average costs. For instance, in a diverse investment portfolio, components may have varying levels of risk and return. A simple mean calculation for returns wouldn’t accurately mirror these differences. By using a weighted average, the portfolio’s performance can be measured more honestly by attributing a higher weight to investments that make up a larger percentage of the portfolio. Similarly, in supply chain management, weights might be attributed according to quantity of product provided by various suppliers to determine the average cost. Similarly, in financial accounting, weighted average is used while calculating the Cost of Goods Sold (COGS) and inventory valuation in a business dealing with diverse range of products, thus providing a more accurate picture of the financial health.


1. Stock Portfolio: In investment, a weighted average is often used to determine the average value of various stocks in a portfolio. If an individual owns shares in several companies, those shares do not each represent an equal proportion of that individual’s overall investment. In this case, the actual value of each share and the number of shares owned would be the weight in the portfolio. Using a weighted average, the investor could determine the average value of a share in their portfolio, taking into account each share’s proportion of the total investment.2. Cost of Inventory: In inventory management, the weighted average cost method is often used to estimate the value of the inventory purchased at different prices. If a company buys 100 units of a product at $10 each, and later buys another 150 units at $15 each, the weighted average cost per unit would be $13 ((100*$10 + 150*$15) ÷ (100 + 150)).3. Grade Point Average (GPA): In the academic field, the term Weighted Average is often used to calculate a student’s Grade Point Average (GPA). Different courses carry different credit hours, and a weighted average takes into account both the grade and the “weight” or credit hours associated with each class. For example, if a student earns an “A” (4.0) in a 3-credit course, a “B” (3.0) in a 4-credit course, and a “C” (2.0) in a 2-credit course, the GPA would be calculated with this formula: ((4*3) + (3*4) + (2*2)) ÷ (3+4+2) = 3.11.

Frequently Asked Questions(FAQ)

What does the term Weighted Average mean in finance?

A weighted average refers to an average where each observation in the data set carries a different “weight” or importance. It is calculated by multiplying each data point’s value with its predefined weight and then summing these products.

Can you provide an example of a weighted average in business?

Sure, a fundamental application of weighted averages in business is their use in calculating a company’s weighted average cost of capital (WACC). The WACC is computed using the individual costs of all the company’s different sources of capital, each one weighted according to its proportion in the company’s capital structure.

How is a weighted average different from a simple average?

While a simple average gives equal importance to all values in the data set, a weighted average assigns a specific weight to each value. This weight can depend on the value’s relative importance or frequency, which affects the final average.

Why might it be beneficial to use a weighted average?

Weighted averages are more accurate and representative than simple averages because they take into account the significance of each data point. This can be especially useful in financial calculations where some factors have a greater impact than others.

How do I calculate a weighted average?

To calculate a weighted average, you first assign a weight to each value in your data set. Then, you multiply each value by its respective weight, and sum the results. Finally, divide this sum by the total of the weights.

Where else are weighted averages used in finance?

In finance, besides the WACC, weighted averages are used in many areas like in the calculation of portfolio returns, average maturity of liabilities, inventory calculations, and many more.

What is the significance of the weighted average in analyzing stocks?

Weighted averages are key in analyzing stocks, particularly when calculating indexes like the Dow Jones Industrial Average or the FTSE 100. These measures use price-weighted or market cap-weighted averages, respectively, to provide a more accurate picture of overall market trends.

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