Mean, median, mode, and more in one place
Paste a list of numbers - separated by commas, spaces, or line breaks, in whatever format you happen to have them - and this tool instantly calculates the count, sum, mean, median, mode, range, and standard deviation. It's a fast way to get quick statistics on survey data, grades, measurements, or any set of numbers without needing to open a spreadsheet or write a formula.
Why mean, median, and mode are shown together
These three measures of "average" can tell meaningfully different stories about the same data. The mean (the sum divided by the count) is the standard average most people mean by that word, but it's sensitive to extreme outliers - a single unusually large or small value can pull it noticeably in that direction. The median (the middle value once sorted) resists that pull, since it only cares about position, not magnitude. The mode (the most frequently occurring value) reveals whether a particular number repeats unusually often, which neither the mean nor median would show on its own.
What standard deviation adds beyond the average
Standard deviation measures how spread out the numbers are around the mean. A low standard deviation means most values cluster tightly near the average; a high one means they're spread widely - two data sets can share the exact same mean while looking completely different in how consistent or variable their individual values actually are, and standard deviation is what reveals that difference.
Common uses
Quickly summarizing a set of survey responses or grades, checking the spread of a batch of measurements from an experiment, or sanity-checking a set of numbers before committing to further analysis elsewhere.