Standard Deviation Calculator

Standard Deviation Calculator

Standard deviation is a statistical measure that quantifies the amount of variation or dispersion in a dataset. It provides valuable information about how closely individual data points cluster around the mean (average) of the dataset.

standard Deviation = 4.898979485566356

How to Use

Input the numbers for which you want to find the standard deviation You can enter multiple numbers separated by commas.

Population vs sample

When calculating standard deviation, it's important to differentiate between populations and samples. For a population, the standard deviation is calculated using all data points, while for a sample, it's calculated using a subset of the data. Samples tend to have slightly higher standard deviations due to their smaller size.

Formula and Calculation

The standard deviation is calculated using a mathematical formula that involves finding the squared differences between each data point and the mean, summing these squared differences, dividing by the total number of data points (or sample size), and then taking the square root of the result.

Practical Applications

Standard deviation is used in various fields, including economics, science, finance, and quality control. It helps identify trends, assess risk, and make informed decisions based on the distribution of data.


While standard deviation is a powerful tool, it may not be suitable for all types of data distributions. For example, in skewed or non-normal distributions, alternative measures of dispersion might be more appropriate.