Standard Deviation Calculator

Behind the result

About this Tool

Calculate mean, variance, and either sample or population standard deviation from pasted numbers.

How it works

Sums squared distances from the mean and divides by n for a population or n−1 for a sample.

A practical way to use it

Compare how tightly two batches of measurements cluster around their means.

Use results as a practical aid, and verify important decisions against your own source data and qualified guidance.