Average Calculator
Find the average (mean) of a list of numbers, or a weighted average where some count more. Shows the steps.
Average Calculator
Average: 25 (10 + 20 + 30 + 40) / 4 = 100 / 4 = 25.
What This Average Calculator Does
Find the average (mean) of a list of numbers, or a weighted average when some numbers should count more than others.
Average Formula
average = (sum of the numbers) / (how many numbers)
weighted average = (n1 x w1 + n2 x w2 + ...) / (w1 + w2 + ...)How to Use It
- Enter the numbers, separated by commas.
- 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.