The formula
How it works
Find the average of a list of numbers. Type or paste your values separated by commas or spaces, and the calculator returns the mean along with the sum, the count, and the smallest and largest values.
FAQ
Which average is this?
This is the mean — add up all the values and divide by how many there are. It is the most common “average”, though the median (the middle value) can be a better summary when a few extreme numbers would skew the mean.
How do I enter my numbers?
Separate them however you like — commas, spaces, or new lines all work. You can paste a column straight from a spreadsheet, and any non-numeric text is simply ignored.
Does one big outlier throw off the average?
Yes — the mean uses every value equally, so a single unusually high or low number can pull it noticeably in that direction. If your data has extreme outliers, the median often gives a more representative picture.
Can I include negative numbers?
Yes, negative numbers are added just like positive ones, so they lower the mean and the sum accordingly. This is useful for averaging things like temperature changes or profit and loss figures.
Does this calculate a weighted average?
No, every value you enter counts equally toward the mean. If some values should count more than others, you would need a weighted average calculation instead.
How many decimal places does the result show?
The mean, sum, minimum and maximum are shown rounded to up to four decimal places, trimming trailing zeros for a cleaner result. The underlying calculation itself is not rounded until the final display.
Is there a limit to how many numbers I can enter?
You can enter as many values as you like — the calculator processes the whole list at once rather than one at a time. Very long lists just take a fraction longer to sum.
About the average calculator
This calculator finds the average — the mean — of any list of numbers you give it. The mean is the single most common way to summarise a set of values with one number, from exam scores and test results to prices, temperatures and measurements. Alongside the mean it shows the sum and the count it used, plus the range, so you can see the spread of your data at a glance.
How to use it
Type or paste your numbers into the box, separated by commas, spaces or new lines — you can copy a whole column from a spreadsheet. The calculator instantly shows the mean, the total, how many numbers it counted, and the smallest and largest values. For example, the numbers 10, 20, 30, 40 and 50 have a mean of 30, a sum of 150 and a count of 5. Any text that is not a number is skipped.
The formula
The mean is the sum of the values divided by how many there are, , where is the total of every value and is the count. It is the balance point of the data — if you imagined the numbers as weights on a ruler, the mean is where it would balance. Because it uses every value, a single very large or very small number can pull the mean noticeably.
Where it is used
Averages are everywhere: a student’s mean grade, a team’s average score, the average price of a basket of goods, or the mean temperature over a week. Businesses average sales and response times, scientists average repeated measurements to reduce error, and sports fans live by batting and scoring averages. It is the first number most people reach for when they want to summarise a set of results.