Cronbach's α (scale reliability) — free, runs in your browser
Internal consistency of a scale/questionnaire: enter a subjects×items score matrix to get Cronbach's α with interpretation, plus α-if-item-deleted to fi… Computed in your browser — no data uploaded.
Open free tool →Runs in your browser
No software installation. Paste your data and get results instantly.
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Export charts as SVG vector or HD/UHD PNG suitable for journal submission.
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Common questions
What are the original references?
Cronbach LJ. Psychometrika 1951;16:297-334; Tavakol M, Dennick R. Int J Med Educ 2011;2:53-55. PMID 28029643.
When should I use Cronbach's α?
Internal consistency of a scale/questionnaire: enter a subjects×items score matrix to get Cronbach's α with interpretation, plus α-if-item-deleted to find items dragging reliability down. A standard metric in scale development and validation.
Is my data safe?
All calculations run entirely in your browser. No data is sent to any server. You can even use the tool offline after the page loads.
Run Cronbach's α now
Internal consistency of a scale/questionnaire: enter a subjects×items score matrix to get Cronbach's α with interpretation, plus α-if-item-deleted to fi… Computed in your browser — no data uploaded.
Open free tool →Free to use. No account required. No data uploaded.
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