Check whether your questionnaire measures consistently. Internal consistency (Cronbach’s alpha) is the first thing supervisors and reviewers ask about for any multi-item scale.
Cronbach's Alpha Calculator
Free Cronbach's alpha calculator: paste Likert data from Excel/SPSS, get alpha, 95% CI, item-total stats, alpha if item deleted and an APA 7 write-up.
Cohen's Kappa Calculator (Inter-Rater Reliability)
Free Cohen's kappa calculator for inter-rater reliability. Paste two raters' codes (numbers or words) to get kappa, SE, z, p, 95% CI and an APA sentence.
Which one do I need?
- Cronbach’s Alpha Calculator: Cronbach’s alpha (α) measures the internal consistency of a questionnaire scale: how closely a set of items (for example, five Likert statements about job satisfaction) measure the same construct.
- Cohen’s Kappa Calculator (Inter-Rater Reliability): Cohen’s kappa (κ) measures how well two raters agree when they assign items to categories, after removing the agreement expected by chance.