Convert knitting needle sizes between US, UK and metric (mm).
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Knitting Needle Size Converter
Craft • US/UK/mm
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Choose a size to see equivalents
Your size
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Equivalent in Every System
How to Use the Knitting Needle Size Converter
Pick the system you know — choose the sizing standard you already have (e.g. US).
Select your size — pick your known size from the list.
Read every equivalent — all other systems update instantly, with your source highlighted.
Why Use This Knitting Needle Size Converter
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Accurate Standards
Built on internationally recognised SI and standards-body conversion factors for dependable results.
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Instant & Animated
Results update live as you type, with a clear visual breakdown across every unit at once.
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100% Private
Everything runs in your browser — no account, no uploads, nothing leaves your device.
Understanding the Knitting Needle Size Converter
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.
Knitting Needle Size Converter FAQ
Largely yes — UK/old sizes get smaller as the needle gets thicker, while US sizes get larger. Always check the mm value, which is unambiguous.