Mean Median Mode Calculator
All four centers of your data at once: mean, median, mode and range.
The three averages
The mean is the sum divided by the count. The median is the middle value once sorted (or the average of the two middle values). The mode is whatever appears most often, and a data set can have several modes or none at all. For 13, 18, 13, 14, 13, 16, 14, 21, 13: mean 15, median 14, mode 13, range 8.
Which one to report
Use the mean for symmetric data where every value should count. Use the median when outliers or skew would distort the mean, which is why house prices and salaries are reported as medians. The mode is the only average that works for categories (the most common shoe size), and the range is the crudest spread measure: max minus min, sensitive to a single extreme value.