Average Calculator

What This Average Calculator Does

The average (or mean) is the single number that would replace every value if they all shared equally. Add everything up, then split the total evenly across however many numbers there are. If three friends scored 6, 8, and 10, the average is 24 ÷ 3 = 8 - the score they would each have if the points were shared out fairly.

A weighted average is the same idea, except some numbers count more than others - like a final exam counting more than a quiz toward your grade.

Average Formula

$$\text{average} = \frac{\text{sum of the numbers}}{\text{how many numbers}}$$ $$\text{weighted average} = \frac{n_1 w_1 + n_2 w_2 + \cdots}{w_1 + w_2 + \cdots}$$

How to Use It

1. Enter the numbers, separated by commas.
2. For a weighted average, choose “weighted average” and enter one weight per number.

Worked Examples

Numbers	Average
10, 20, 30, 40	25
5, 8, 12	8.33
100, 0	50

Weighted: 80 (weight 1) and 90 (weight 3) gives $(80 + 270) / 4 = 87.5$.

FAQ

How do you calculate an average?

Add all the numbers and divide by how many there are. For 10, 20, 30, 40: $100 / 4 = 25$.

What is a weighted average?

Each number is multiplied by its weight, the results are added, and the total is divided by the sum of the weights. Use it when some values matter more.

Is the average the same as the mean?

Yes. The “average” people usually mean is the arithmetic mean this tool calculates. For the median and mode too, use the mean, median, mode calculator.