Knitting Needle Size Converter
Convert knitting needle sizes between metric millimeters, US sizes, old UK/Canadian numbers, and Japanese needle sizes. Useful when a vintage pattern, imported pattern, or needle package uses a different system.
Convert a knitting needle size
Pick the system you know, enter the needle size, and see the nearest common equivalents instantly.
A 5 mm knitting needle is commonly labeled US 8, old UK/Canada 6, and Japanese 10.
How to use knitting needle conversions
- Use the metric millimeter size when it is printed on the needle; it is the most direct comparison.
- Remember that old UK and Canadian numbers run opposite of US numbers: smaller UK numbers usually mean larger needles.
- For garments and fitted items, make a gauge swatch after converting because brand tips and materials can change tension.
- If your swatch is too tight, go up a needle size. If it is too loose, go down a needle size.
Quick knitting needle size chart
| Metric | US | Old UK/Canada | Japan |
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Knitting needle conversion FAQ
Is a US 8 knitting needle the same as 5 mm?
Yes, US 8 is commonly listed as 5 mm. Some older or specialty needles may vary slightly, so use the printed metric size when available.
Why are old UK knitting needle sizes confusing?
Old UK and Canadian needle numbers get smaller as needles get larger. For example, an old UK 6 is about 5 mm, while an old UK 10 is about 3.25 mm.
Can I substitute a nearby needle size?
Often yes for scarves, blankets, and relaxed projects. For fitted pieces, use the converted size as a starting point and adjust after checking your gauge.