Crochet Hook Size 101

Hooks will have a definitive size printed onto them. It will be in either metric or US terms. US terms include both letters and numbers. Standard crochet hooks range from US size B/1 (2.25 mm) to jumbo size S (19 mm). Hook size vary depending on manufacturer. For example, some older antique hooks in my sister in law’s set are very small in comparison to my own more recently manufactured aluminum Boye set. That is because numbering systems have changed over time. Even with an H hook of the same manufacturer, size may vary slightly. That is why it is always best to use a hook gauge to be sure of your size of hook in metric terms.

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