The pooled standard deviation is a weighted average of two standard deviations from two different groups. It is typically used in a two sample t-test.

To calculate the pooled standard deviation for two groups, simply fill in the information below and then click the “Calculate” button.

Enter raw data Enter summary data

Sample 1

Sample 2

s₁ (sample 1 standard deviation)

n₁ (sample 1 size)

s₂ (sample 2 standard deviation)

n₂ (sample 2 size)

Pooled standard deviation = 7.739852