Average Calculator
Arithmetic mean, sum and count of a list of numbers.
How it works
Mean = sum ÷ count
The arithmetic mean is the most common measure of central tendency but is sensitive to outliers. Separate numbers with commas, spaces or newlines; non-numbers are ignored.
FAQ
Mean vs median?
The mean is the sum divided by count; the median is the middle value after sorting. The median is more robust to outliers.
Worked example
Data 2, 4, 4, 5, 9: (2+4+4+5+9) ÷ 5 = 24 ÷ 5 = 4.8.
Drop the outlier 9 and the mean becomes 3.75 — a single extreme value moved it by 1.05.
Notes and limitations
The mean uses all data but is outlier-sensitive. With skewed data (income, house prices, dwell time), the median represents the typical case better. Report both.