I’m knitting an arm warmer for my hubby and need help with some math. His arm is ten inches around by the elbow and six around by the wrist. I am using 1×1 ribbing and I have 52 stitches on my needles. I need help figuring out how much to decrease. I already made one but it’s more like an infant legwarmer.

So are 52sts comfortable around a 10 inch arm near the elbow? If so and if you want that same degree of ease then 52sts x 6" divided by 10" or about 32sts around the wrist.

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Thanks it fits well.