Free calculators and unit converters for general and everyday use.

Calculators » Math » Standard deviation

Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate standard deviation, mean, and variance of a set of numbers.

Advertisement

Standard deviation is the square root of the Variance.

Steps to calculate the variance:

- Work out the Mean (the simple average of the numbers)
- Then for each number: subtract the Mean and square the result.
- Then work out the average of those squared differences.

**Standard deviation formula:**

© everydaycalculation.com