Average Calculator
Calculate the mean of a list of numbers, with the sum and count shown.
What is Average?
The arithmetic mean is the sum of the values divided by how many there are — the measure of centre most people mean by "the average". It uses every value, which makes it the most informative average when the data is symmetric and the most misleading one when it is not: a single extreme reading moves it further than any other measure of centre.
How it works
One pass over the list accumulates the sum and the count, and the mean is their ratio. Because the same engine call produces the median, the range and the standard deviation, the page can show the comparison that matters — how far the mean has been pulled away from the middle of the data — rather than leaving the reader to compute it on another page.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.