Weighted Average Calculator

Calculate the weighted average of a set of numbers.

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Features

Dynamic Rows

Add as many value-weight pairs as you need for your calculation.

Detailed Breakdown

See exactly how each value contributes to the final average with a percentage breakdown.

Instant Calculation

Results, including Total Weight and Total Product, update instantly as you type.

About Weighted Average Calculator

Calculate the weighted average of a dataset where some values contribute more than others. This tool is essential for students calculating GPA, investors analyzing portfolio returns, or businesses determining the average cost of inventory. Unlike a simple average, a weighted average takes into account the relative importance (weight) of each value.

How to Use Weighted Average Calculator

  • 1
    Enter Values

    Input the numbers you want to average in the 'Value' column.

  • 2
    Enter Weights

    Input the corresponding weight for each value in the 'Weight' column.

  • 3
    Add/Remove Rows

    Use the 'Add Row' button to include more data points or the trash icon to remove them.

  • 4
    View Result

    The weighted average is calculated automatically and displayed on the right.

  • 5
    Analyze Breakdown

    Check the table below the results to see the product and percentage contribution of each row.

Frequently Asked Questions

A weighted average is a calculation that takes into account the varying degrees of importance of the numbers in a data set. In a simple average, each number has equal weight, but in a weighted average, some numbers contribute more to the final result than others.
To calculate the weighted average, you multiply each value by its corresponding weight, sum up these products, and then divide the total by the sum of the weights. The formula is: W = Σ(x * w) / Σw.
A simple average (arithmetic mean) assumes that all values are of equal importance. A weighted average assigns a specific weight to each value, allowing some data points to have a greater influence on the result than others.
Yes, you can use percentages as weights. The calculator handles the division by the total weight automatically, so it works correctly whether your weights sum to 100, 1, or any other number.
That is perfectly fine. The weighted average formula divides by the *sum* of the weights, whatever that sum may be. The weights represent relative importance, not necessarily parts of a whole 100%.