4 mm knitting needles US size
Find the US and old UK size for 4 mm knitting needles. Compare nearby needle sizes and see typical yarn weights.
This page is tuned for the exact search query and shows how this size looks in metric (mm), US sizes, and old UK sizes. It also lists nearby needle sizes so you can adjust your gauge if needed.
Adjust needle size
You landed here from a size-specific search, but you can still switch systems and values to explore other conversions.
Change this value to see other sizes. We will always snap to the closest standard needle in the chart.
Typical yarn weight for this size: worsted.
Needle size is always about diameter in mm. US and UK numbers are just labels. If the mm value matches, the needles are the same size, even when the printed numbers look different.
When substituting needles for a pattern, match the mm size first. Then knit a small swatch and adjust up or down one size if your gauge is too tight or too loose.
Nearby needle sizes
If this size feels too tight or too loose, these are the next sizes knitters usually move to.
See the full knitting needle conversion chart
This page focuses on one size, but the full chart lists every standard needle size in mm, US, and old UK systems. You can download it or print it as a reference.
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Common questions about this needle size
Answers tailored around this exact size so you do not have to guess.