Statistics Calculator — Mean, Median, Standard Deviation
Paste a column of numbers, get the whole summary.
Runs on your device What you paste is processed by your own browser. It is never sent to a server, and it is not stored anywhere after you leave the page.
Short answer
Descriptive statistics for a set of numbers can be calculated for free in a web browser: count, sum, mean, median, mode, minimum, maximum, range, variance and standard deviation, all at once. Numbers may be separated by newlines, spaces, commas or semicolons, so a column pasted straight out of a spreadsheet works unedited. The variance and standard deviation can be computed on a sample basis, dividing by n−1, or a population basis, dividing by n.
At a glance
| Accepts | Numbers separated by anything |
|---|---|
| Produces | Ten descriptive statistics |
| Processing | In your browser |
| Price | Free, no limits |
| Account | Not required |
Every statistic is shown together rather than one at a time, because they are read together. A mean without the range beside it hides whether the set is tight or scattered, and a mean with a median that disagrees with it is the clearest signal that something in the data is skewed.
The sample-versus-population choice is the one setting that changes an answer, and it is not a detail. Dividing by n−1 is Bessel's correction, which compensates for the fact that a sample's own mean sits closer to its own values than the true mean does. Use the sample basis for measurements drawn from something larger — which is almost always — and the population basis only when the numbers in the box are the entire group you care about.
How to use it
- 1
Paste your numbers
A column from a spreadsheet, or a comma-separated list. Any mixture of separators works.
- 2
Say what the numbers are
A sample of something larger, which is the usual case, or the whole population.
- 3
Convert
Ten statistics come back at once, lined up for reading.
- 4
Copy the summary
Copy the whole table to the clipboard, or download it as a text file.
Frequently asked questions
Should I choose sample or population?
Sample, unless the numbers you pasted are the entire group you are describing. Measurements, survey responses and test results are samples of something larger; the ages of your four grandparents are a population.
What is the difference between mean and median?
The mean is the total divided by the count; the median is the middle value once sorted. The median ignores how extreme the outliers are, which is why median income is reported rather than mean income.
Why does it say my set has no mode?
Because nothing repeats. When every value appears once there is no most-common value, and reporting all of them as modes would be less honest than saying there is none. Where several values tie for most frequent, all of them are listed.
What separators can I use?
Newlines, spaces, tabs, commas and semicolons, in any combination. Every number in the box is read, wherever it sits.
Is my data uploaded?
No. The arithmetic happens in your own tab. Statistics get run on salary columns, medical measurements and exam results, which is precisely why this page has no server behind it.