Measure twice, make once
Knitting needle converter
Look up Craft Yarn Council metric and US knitting needle sizes.
The page shows its formula, example, assumptions, rounding, and limitations beside the calculator.
Knitting needle converter
Look up Craft Yarn Council metric and US knitting needle sizes.
Limits and rounding
Millimetres are authoritative. US labels vary by manufacturer, steel hooks use a separate reverse-numbered system, and blank US entries mean the CYC table gives no equivalent. Pattern gauge still decides the working size.