Average / Statistics Calculator

The Average / Statistics Calculator turns a list of numbers into the summary statistics you'd otherwise compute by hand or in a spreadsheet: mean, median, mode, range, and both population and sample standard deviation. Paste or type numbers separated by commas, spaces or new lines — mixed separators are fine, and non-numeric entries are simply ignored — and every statistic recalculates live as you edit the list. It's built for students checking homework, anyone reviewing a small dataset, or quickly summarizing a set of measurements without opening a spreadsheet.

Mean, median and mode each answer "what's typical" a little differently, and seeing all three side by side makes it easy to spot when they disagree — a sign the data might be skewed by outliers. The mean (arithmetic average) is sensitive to extreme values; the median (the middle value when sorted) isn't; the mode (the most frequent value) only appears when a value repeats, and shows "None" when every number in the list is unique.

Standard deviation measures how spread out the numbers are from the mean, and this tool reports both versions used in statistics: the population standard deviation (when your list is the entire dataset you care about) and the sample standard deviation (when your list is a sample used to estimate a larger population's spread, which uses Bessel's correction — dividing by n−1 instead of n — to avoid underestimating the true variability).

Everything computes instantly and privately in your browser as you type — nothing about your dataset is uploaded anywhere. A shareable link (via the Share button) lets you send a specific dataset and its computed statistics to someone else without them needing to retype the numbers.