When should I choose sample mode?
Use sample mode whenever you are estimating σ from a subset of a larger population—stats classes, surveys, or experiments. Population mode only applies when you have every possible observation.
Step-by-step walkthrough
Standard Deviation Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- standard deviation
- sigma
- volatility
- dispersion
Detailed procedure
Step 1
Paste numbers separated by commas, spaces, or new lines.
Step 2
Select sample or population mode to match your assignment or compliance rule.
Step 3
Optional: adjust decimal places to tighten or loosen the reported precision.
Teaching & troubleshooting tips
Why is the coefficient of variation blank?
CV requires both a non-zero mean and a finite standard deviation. If your data is centered at zero or too short for sample σ, the metric is suppressed to avoid misleading percentages.