Standard Deviation Calculator
Enter a list of numbers separated by commas, spaces or new lines — get count, sum, mean, variance and standard deviation (both sample and population) with intermediate values.
Enter values — the result will show here live.
How to use
- Enter data values — you can separate them with commas, spaces or Enter.
- The result shows count, sum and mean first, then the sum of squared deviations, then variance and SD.
- Use population SD for a full group, and sample SD when your data is only a sample of a larger group.
Note: Population variance = sum of squared deviations / N. Sample variance = sum / (n - 1). SD is the square root of variance. You need at least 2 values for the sample.
Frequently Asked Questions (FAQ)
How do I enter my data?
Type or paste numbers separated by commas, spaces or new lines.
What results does it show?
Count, sum, mean, variance and standard deviation — both sample and population — with the intermediate values.
Which should I use, sample or population SD?
Use population SD when your data is the full group; use sample SD when your data is only a sample of a larger group.
Is the standard deviation calculator free?
Yes. It is free, needs no signup, and runs in your browser.