This free standard deviation calculator computes the standard deviation, variance, mean, sum, and error margin of a given data set.

When calculating the sample standard deviation, we divide by n−1 instead of n to correct for the bias in estimating the population standard deviation from a sample.

Aug 26, 2025 · Standard deviation tells you how spread out the numbers are in a sample. Once you know what numbers and equations to use, calculating standard deviation is simple! Look at your data …

Sep 17, 2020 · Different formulas are used for calculating standard deviations depending on whether you have collected data from a whole population or a sample. When you have collected data from …

To calculate the standard deviation of those numbers: 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 …

Calculate the **Variance** by finding the average of the squared deviations (divide by N or N-1). Find the **Square Root** of the Variance to get the Standard Deviation.

Use this tool to quickly understand the variability in your dataset. Below the calculator is additional information about using it. In the standard deviation calculator: Choose sample if your data are a …

Use the Standard Deviation Calculator to quickly find mean, variance, and standard deviation for your data set. Fast, and accurate.

2 days ago · Standard deviation is a fundamental statistical measure that quantifies the amount of variation or dispersion in a dataset. This comprehensive guide provides all essential formulas related …

In statistics, the standard deviation is a measure of the dispersion or variability between observations in a data set or realizations of a random variable. A smaller standard deviation value indicates that the …