Average Calculator
Calculate the arithmetic mean, weighted average, and geometric mean of any set of numbers. Instant results with a clear breakdown.
Arithmetic Mean (Average)
Enter numbers separated by commas, spaces, or new lines.
Types of Averages Explained
Arithmetic Mean — The most common average. Add all values and divide by the count. Best for data without extreme outliers.
Weighted Average — Each value has a weight reflecting its importance. Multiply each value by its weight, sum the products, then divide by the total weight. Used in grading, finance, and surveys.
Geometric Mean — The nth root of the product of n numbers. Best for growth rates, ratios, and percentages. Requires all positive numbers.
Frequently Asked Questions
Add all the numbers together and divide by how many numbers there are. For example, the average of 10, 20, and 30 is (10+20+30) / 3 = 20.
A weighted average assigns different importance (weights) to each value. Use it when some values matter more than others — for example, calculating a final grade where exams count more than homework.
The geometric mean is used when comparing growth rates, ratios, or percentages. It is the correct average for multiplicative data, like average investment returns over multiple years.
In common usage they mean the same thing — the arithmetic mean. Technically, "average" can also refer to median or mode, but it most often means the sum divided by the count.
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