Enter a list of numbers to calculate the mean, median, mode, and range all at once.
How to Use the Mean, Median, Mode, and Range Calculator
Type a number into each row, and add or remove rows with the buttons below the list — all four statistics recalculate as the data set changes.
These four numbers all try to summarize a data set, and they routinely disagree with each other. Mean adds everything up and divides by the count — the one everyone learns first, and the one an outlier distorts hardest.
mean = (sum of values) ÷ (count of values)Take [1, 2, 3, 4, 100]: the mean comes out to 22, dragged up entirely by that last value. The median — the middle value once the list is sorted, or the average of the two middle values when the count is even — ignores how far an outlier sits and only cares about its position. For that same set, the median is 3, which reflects what a "typical" entry actually looks like far better than 22 does.
Mode and Range Measure Different Things Entirely
Mode is the value or values that show up most often, and it's the odd one out of the four — it's the only one that still makes sense on non-numeric categories in general use (most common shirt size, most common survey answer), even though this tool only works with numbers. A data set can have one mode, several tied modes, or none at all — if every value appears exactly once, there's no meaningful "most common" value, and the calculator reports that plainly rather than picking one arbitrarily.
Range is the crudest of the four: maximum minus minimum, nothing more. It tells you the total spread but nothing about what's happening in between — two data sets can share an identical range while one clusters tightly around the center and the other splits evenly between the two extremes. Reach for standard deviation, not range, when the shape of that spread actually matters.