Standard deviation (σ) calculator with mean value & variance online.

Population and sampled standard deviation calculator

Enter data values delimited with commas (e.g: 3,2,9,4) or spaces (e.g: 3 2 9 4) and press the Calculate button.

Enter data values:
Population standard deviation:
Sample standard deviation:
Population variance:
Sample variance:

Discrete random variable standard deviation calculator

Enter probability or weight and data number in each row:

Probability Data number
Standard deviation: