Convert knitting needle sizes between US, UK and metric (mm).
Craft • US/UK/mm
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Knitting needles are sized differently in the US, the UK and metric (mm), and the old UK scale runs backwards. This chart converts needle sizes across all three systems so you can follow any pattern.
Knitters working from international or vintage patterns use it to match the gauge a pattern calls for. The metric (mm) value is the unambiguous one to rely on when in doubt.