Average Calculator

How It Works

The calculator parses a list of numeric values from your input, ignoring separators such as commas, spaces, and line breaks. It calculates the arithmetic mean by adding the values and dividing by the count. If a valid list of matching weights is also provided, it calculates a weighted average by multiplying each value by its weight, summing those products, and dividing by the total weight.

Example

If the values are 8, 7.5, 9, and 10, the mean is 8.625. If the weights are 2, 3, 1, and 4, the weighted average becomes 8.75 because the larger weights shift the result toward the more heavily weighted scores.

When to use this calculator

• Use it when you need a fast mean from a raw list of numbers.
• Use it when grades, scores, or allocations should not all count equally.
• Use it when copying values directly from notes or spreadsheets is faster than building a table manually.

When weighted average is useful

• Course grades with different credit counts.
• Portfolio allocations with different sizes.
• Category scores that do not contribute equally.
• Any list where some observations should count more than others.

How to avoid mistakes

• Keep the values list and weights list in the same order.
• Do not include text labels inside the number list.
• If weights are optional in your scenario, leave them empty and use the plain mean instead.

Important limitations

• This tool focuses on mean and weighted average only.
• It does not calculate standard deviation, quartiles, or advanced statistics.
• Weighted results are only meaningful when the weights actually represent importance or proportional contribution.