Statistics calculator

How it works

Enter a list of numbers to get the mean, median, mode, range and standard deviation.

The formula

Mean = sum ÷ count. Median = middle value when sorted. Standard deviation = √(Σ(x − mean)² ÷ n) for a population, or ÷ (n − 1) for a sample.

Worked example

2, 4, 4, 4, 5, 5, 7, 9: mean 5, median 4.5, mode 4, population SD 2, sample SD ≈ 2.14.

Good to know

• Use the sample SD when your numbers are a sample from a larger group.