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Standard Deviation Calculator

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.

e.g., 1, 2, 3

Result window

Calculating Standard Deviation

Standard deviation is the square root of the Variance.
Steps to calculate the variance:

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

Standard deviation formula:

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