Mean And Standard Deviation Calculator
Calculate the mean, standard deviation (population and sample), variance, and sum of squares for a set of numbers. Handles comma or space separated values.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Mean & Standard Deviation Calculator
- Enter your numbers in the text area. Separate them with commas or spaces (e.g.,
5, 10, 15, 20or5 10 15 20). - Click “Calculate” or press Enter on your keyboard.
- View the results displayed below:
- Count – total number of values entered.
- Mean – the average of your numbers.
- Sum – total of all numbers.
- Population Std Dev – standard deviation assuming your data is the entire population (divides by n).
- Sample Std Dev – standard deviation assuming your data is a sample (divides by n-1).
- Population Variance and Sample Variance – the squared versions of the above.
- Need at least 2 numbers to calculate standard deviation. Enter only numeric values (decimals allowed).
Tip: The calculator uses the standard formulas shown at the bottom. No special units or formats required—just raw numbers.
Previous Results
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Frequently Asked Questions
Population standard deviation uses the entire dataset (divides by N), while sample standard deviation uses a subset (divides by N-1) to correct for bias.
Yes, you can separate numbers with commas, spaces, or a mix of both.
It shows count, mean, sum, population and sample standard deviation and variance, and the formulas used.
