Needle size mm to US

I was going to order a size 1 flexible dpn. The addi flexiflips 2.5mm is US size 1 but the hiyahiya says 2.5mm is US size 1.5. I don’t understand why different. Does anyone know


Not a great photo but can you see on the needle sizer a US 1 is a bit bigger than 2.25mm but smaller than 2.5mm.

If it’s really important that you have a US size 1 to get gauge then perhaps look for a different make that does US sizes. Otherwise I think you might need to decide which mm size you’d prefer. Slightly higher than a 1 or slightly smaller than a 1.

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Per my Knitter’s Pride gauge US1 is 2.25 mm; US 1.5 is 2.5 mm. I agree, pick what you think will work best for you.

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Thanks for the info. Really not sure. I knit my granddaughters sock using size2. Thought the cuff a little loose so when I knit the socks mate I was going to go down a size. So don’t really know which would be best…

You might check the gauge on the sock you already made; if it’s fingering yarn you want 8 sts or more/in. For socks done with fingering weight yarn I would typically use a 1.5 or maybe a 1 or 0 (zero) depending on how tight I currently am knitting. Lately my sock knitting has been with thicker yarn for slippers but tighter gauge = longer wear no matter what yarn is used. Sometimes I’ll grab a skinny needle for socks and not even bother with checking the size because after awhile you know what works for you and your knitting style. I do toe-up, knit to fit (learned it from Lifestyle Socks) and may change to smaller or larger needles as I knit the toe or after finishing the toe increases.

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Thanks lots of interesting information. I even looked at Lifestyle toe up socks from ravelry. Even considering going down a size in needle for entire sock but not sure if that’s best since I’m not sure if will be be a noticeable change from first sock. Granted I feel first sock a little big but as I said her feet grow (believe me all the time). Constantly having to get new shoes, new dance shoes etc. so maybe I should use the same needle size for body of sock and only change the cuff size needle. Lots to consider

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Changing needles for the second will make it a different size. You might like that better and want to frog and reknit the first one to match. Kids feet do grow fast so maybe you want to make this one match the other one. That would be be easiest and makes sense.