Cronbach's Alpha Calculator
From Item and Total Variances
From Average Inter-Item Correlation
Formula
alpha = (k/(k-1)) * (1 - sum(item_var)/total_var)
Frequently Asked Questions
What is Cronbach's alpha?
Cronbach's alpha measures internal consistency reliability, indicating how closely related a set of items are. Values range from 0 to 1, with 0.7+ generally acceptable.