Intraclass Correlation (ICC) Calculator
Measure how consistently raters score the same subjects. Paste one row per subject with each rater’s numeric score.
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Single vs average measures
Single-measures ICC estimates the reliability of one rater’s score, which is what you want when a single rater will score each subject in practice. Average-measures ICC estimates the reliability of the mean of all raters, which applies when you will always average several raters together. This tool reports both.
Which form this uses
This calculator computes the two-way random-effects, absolute-agreement form, ICC(2,1) and ICC(2,k), the version usually reported for inter-rater reliability. Common interpretation bands are: below 0.5 poor, 0.5 to 0.75 moderate, 0.75 to 0.9 good and above 0.9 excellent.
Frequently asked questions
How is ICC different from Cohen’s kappa?
Kappa is for categorical ratings, where raters pick a category. ICC is for numeric ratings on a continuous scale, and it credits partial agreement between close scores rather than treating any mismatch as full disagreement.
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