Pooled Variance Calculator

This calculator will generate an estimate of a population variance by calculating the pooled variance (or combined variance) of two samples under the assumption that the samples have been drawn from a single population or two populations with the same variance.

Just add your sample scores into the text boxes below, either one score per line or as a comma delimited list, and then hit Calculate. (Note: If you already know your standard deviations and sample sizes, you can use the calculator at the bottom of the page.)

X Values

Y Values

No calculation has been performed yet.

Alternative Calculator

If you already know your standard deviations and sample sizes then you can use the calculator below to determine the pooled variance of your two samples.

Standard Deviation 1 (s₁):
Sample Size 1 (n₁):
Standard Deviation 2 (s₂):
Sample Size 2 (n₂):

No calculation has been performed yet.