Is Standard Deviation Calculator free?

Yes, completely free with unlimited calculations and no registration required. All features are accessible without any hidden fees or premium tiers.

What is the difference between sample and population standard deviation?

Sample standard deviation (uses n-1) estimates the spread for a subset of data. Population standard deviation (uses n) calculates the spread for an entire dataset. Use sample for smaller datasets or surveys.

How many numbers can I input?

You can enter up to 10,000 data values. The calculator processes large datasets instantly without performance issues.

Does Standard Deviation Calculator work on mobile?

Yes, fully responsive and works on iPhone, Android, tablets, and desktop browsers. Input values the same way on all devices.

What does variance mean?

Variance is the average of squared differences from the mean. Standard deviation is the square root of variance, making it easier to interpret in original units.

Is my data safe with this calculator?

Yes, completely safe. All calculations happen in your browser. Data never uploads to servers and is not stored or tracked.

Can I use decimal numbers?

Yes, you can use whole numbers, decimals, and negative numbers. Format as: 10.5, -5, 20.75, 15 separated by commas.

What file formats are supported?

Accepts comma-separated values (CSV), space-separated values, and tab-separated values. Paste or type directly into the input field.

free

Standard Deviation Calculator — free

Calculate standard deviation and variance of a dataset.

Enter numbers (comma, space, or newline separated)

How to use Standard Deviation Calculator

Enter Your Data Values

Click the 'Data Input' field and enter your numerical values separated by commas (e.g., 10, 20, 30, 40). You can paste up to 10,000 data points directly into the textarea.

Select Sample or Population

Choose between 'Sample' or 'Population' from the dropdown menu below the data input. Sample uses n-1 for smaller datasets; Population uses n for complete datasets.

Click Calculate Button

Press the blue 'Calculate Standard Deviation' button. Results appear instantly in the output panel showing standard deviation, variance, mean, and count.

Review Results

View the calculated values displayed with up to 6 decimal places. Use the 'Copy Results' button to copy all values to your clipboard for pasting elsewhere.

Clear and Start Over

Click the 'Clear All' button to reset the calculator and remove all previous data for a new calculation.

Frequently Asked Questions

Related Tools

🔢

Statistics Calculator

Calculate mean, median, mode, and standard deviation.

🔢

Probability Calculator

Calculate basic probability and combinations.

🔢

Percentage Calculator

Calculate percentages easily: find X% of Y, percentage change, percentage difference, and more.