Tool
Hook & Needle Size Converter
Pick a metric size and see the matching US and UK/Canadian label instantly. Metric is the one measurement that stays constant across every system, so it doubles as the universal key here.
Knitting Needles
US Size
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UK / Canadian Size
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Crochet Hooks
US Size
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UK / Old Size
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Full tables: knitting needle size chart · crochet hook size chart.