Standard Deviation Calculator

Calculate the standard deviation of your data. This calculator is intended to assist you in quickly and accurately calculating the standard deviation, variance, mean, sum, and count of a set of numbers. Simply enter your data points in the multi-line text field below, separated by commas. Whether you’re a student, researcher, or data enthusiast, this calculator is a useful tool for statistical analysis, data interpretation, and problem-solving.

Standard Deviation Calculator

Standard Deviation, σ:


Count, N:


Sum, Σx:


Mean, μ:


Variance, σ²:


How to use the Standard Deviation Calculator:

Enter Your Information: A large, multi-line text field labeled “Enter numbers separated by commas” will appear. Start typing in this field by clicking it. A comma should be used to separate each number. For example, if you have the numbers 8, 15, 9, 23, 15, 3, 19, and 25, you would enter them as 8,15,9,23,15,3,19,25.

Submit Your Data: After you’ve entered all of your information, click the “Calculate” button. This will send your information to the calculator.

View the Outcomes: The calculator will process your data and display the results in five separate cards after you click “Calculate.” These cards will display your data set’s Standard Deviation (σ), Count (N), Sum (Σx), Mean (μ), and Variance (σ²) of your data set, respectively.

Interpret the Results: Apply these findings to your data analysis. The amount of variation or dispersion in a set of values is measured by standard deviation. A low standard deviation indicates that the values are close to the mean, whereas a high standard deviation indicates that the values are dispersed over a larger range.

Reset the Calculator: To perform a new calculation, simply clear the text field and enter a new set of numbers, then hit “Calculate” again.

Remember that each number must be separated by a comma, and no characters other than numbers and commas are permitted. The calculator will take care of the rest!

What is Standard Deviation:

The standard deviation is a statistical measure that indicates how much individual data points in a group differ from the group’s average, or mean.

Assume you’re with a group of friends and you’re comparing heights. If you and your friends are all roughly the same height, the standard deviation will be low because everyone is close to the average height. If one friend is very tall and another is very short, the standard deviation will be high because the heights are more spread out from the average.

Consider this: if you and your friends took a test and almost everyone got the same score, the standard deviation of those scores would be low. However, if some scores were extremely high and others were extremely low, the standard deviation would be extremely high.

Standard Deviation Graphs - Learn Lean Sigma


The standard deviation is useful because it indicates the amount of “variability” or “dispersion” in a set of data. In other words, it tells us how much the data tends to scatter around the mean. This can be useful when analyzing test results, survey responses, scientific data, and other types of data.

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