When should I use sample standard deviation?

Use the sample figure when your numbers are a sample drawn from a larger group, and the population figure when they are the whole group.

Is anything I enter stored?

No. The calculation happens in your browser and nothing is sent or saved.

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Calculate mean, median, mode, range and standard deviation of a list of numbers.