Hook & Needle Converter
Crochet hook and knitting needle size equivalents across US, metric, UK, and Japanese systems.
Crochet Hook Size Equivalents
| Metric (mm) | US Letter | US Number | UK / Canada | Japanese | Best For |
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Knitting Needle Size Equivalents
| Metric (mm) | US | UK / Canada | Japanese | Best For |
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Hook Materials Matter
Aluminum hooks are slick and fast. Bamboo hooks grip the yarn for more control. Ergonomic hooks with cushioned handles reduce hand fatigue on long projects. Most crocheters keep multiple materials for different yarns.
Needle Types for Every Project
Straight needles for flat knitting, circular needles for in-the-round (and flat too), double-pointed needles (DPNs) for small circumferences like socks. When in doubt, always use the millimeter measurement — it's universal.