Why this tool is useful
Use overlap coefficient when you need to know how completely a smaller tag, topic or vocabulary set is contained in a larger one.
Text & List Tools · runs locally
Word Overlap Coefficient Calculator
Divide the shared unique-word count by the size of the smaller normalized word set to reveal set containment.
Ready. Your working data stays in this browser.
How it works
The local tool forms two normalized Unicode word sets, counts their intersection and compares it with the smaller set size rather than their union.
Practical example
The sample texts share one word and the smaller set has two, giving an overlap coefficient of 0.5.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.