Pooled Standard Deviation Calculator Widget

Keep groups separate and choose raw observations, sample SDs or sample variances. All groups use the same measurement unit.

Starting information

Group 1 observations (required)

Group 2 observations (required)

Group 1 sample size (required)

Group 1 sample SD (required)

Group 1 sample variance (required)

Group 2 sample size (required)

Group 2 sample SD (required)

Group 2 sample variance (required)

Add more groups Hide additional groups

Additional raw groups

Additional sample size and SD pairs

Additional sample size and variance pairs

Pooled standard deviation

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Pooled variance —

Total degrees of freedom —

Quantity and interpretation —

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Group contributions

Group contributions —

Pooling working

Pooling working —