Statistics Calculator
Calculate the key statistics of a data set — mean, median, mode, range and more.
Summarising a data set
A set of numbers is hard to grasp as a list, but a handful of summary statistics captures its shape. This calculates the mean, median, mode, range and other measures at once, so you can understand a data set's centre and spread from a single input.
Enter your numbers to see their statistics.
Why the median often beats the mean
The most useful thing to understand here is the difference between the mean and the median, both measures of the centre. The mean is the average, but it is pulled by extreme values — one very large number drags it up — while the median, the middle value, is not. This is why average income can look high when most people earn far less, skewed by a few very high earners: the median gives a truer sense of the typical person. Seeing both, alongside the spread, tells you far more than any single number, and knowing which to trust for a given data set is one of the most practically valuable ideas in statistics.
Frequently asked questions
What is the difference between mean and median?
The mean is the average, pulled by extreme values; the median is the middle value, which is not. The median often better reflects the typical case.
When is the median more useful than the mean?
When data has outliers or is skewed — like incomes, where a few very high earners inflate the mean but not the median.
Is anything uploaded?
No. The calculation happens in your browser.