Average (Mean) Calculator

Add a list of numbers and instantly get the average (mean), the sum, and how many numbers there are.

Average calculator

Numbers (separate with commas)

Type or paste your numbers separated by commas (12, 18, 9, 21). The calculator adds them, counts them, and divides the sum by the count.

Mean = (sum of all numbers) ÷ (count of numbers)

Example: Numbers 12, 18, 9, 21 → sum 60, count 4 → mean = 60 ÷ 4 = 15.

Example: Test scores 70, 85, 90, 65, 80 → mean = 390 ÷ 5 = 78.

What is the difference between mean, median, and mode?

The mean is the arithmetic average; the median is the middle value when sorted; the mode is the most frequent value.

How do I find the average in Excel?

Use =AVERAGE(range), e.g. =AVERAGE(A1:A10).

Can I include decimals?

Yes — decimals and negative numbers work fine.