USのアルファベットサイズ、UKの番号、メートル法（mm）、日本の号数間でかぎ針サイズを変換。各サイズに推奨される毛糸の太さも掲載。
| Metric (mm) | US | UK | Japan | Typical yarn |
|---|
Hook sizing is a lookup, not a formula. Metric mm is the only true measurement — US, UK and Japanese systems each use letters or numbers that map to a hook diameter. The chart below uses Craft Yarn Council standards.
UK numbers go DOWN as the hook gets bigger (opposite of metric). Always check gauge on your project — different manufacturers vary by ±0.1 mm.
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