Statistics How To

Variance and Standard Deviation Calculator

This standard deviation calculator calculates the standard deviation and variance from a data set. In addition, you’ll also be able to see your answer step-by-step below.

Data set:


  • Variance:
  • Standard Deviation:

  1. First, I summed all the numbers:
  2. I squared the sum, and divided the number of items in the data set
  3. I took my set of original numbers from step 1, squared them individually this time, and added them all up:
  4. I subtracted the amount in step 2 from the amount in step 3:
  5. I subtracted 1 from the number of items in my data set:
  6. I divided the number in step 4 by the number in step 5:
  7. Finally, I took the square root of the number from step 6 (called the Variance),

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11 thoughts on “Variance and Standard Deviation Calculator

  1. SS

    11.00 7.50 8.50 10.00 10.00 10.50 5.50 10.00 9.00 9.50 5.25 8.00

    Could you solve for above 12 numbers please? I tried and could not :(

  2. Sheila

    Can you please give me the formula for this calculation? I want to see what it looks like, in order to follow it with the above calculations.

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