Hook Conversion Chart

The following chart may be useful when using older crochet patterns that specify the old UK imperial size crochet hooks, or American patterns.

The following chart provides approximate equivalent crochet hook sizes for our metric sizes to American sizes. The American sizes appear to vary between brands, especially from 7mm and larger. Many American crochet books now provide a similar conversion guide for hook sizes. Use the tension information, if provided in the pattern, to ensure correct hook selection.