What is size 4 worsted weight yarn?

What does 4 mean in yarn?

Each number is actually a category that contains a group of thicknesses. For example, ‘4’ contains: worsted, afghan and aran yarns… and the recommended needle size ranges from 7 to 9 (and hooks from I to K).

What weight is 4 ply yarn?

Fingering weight (traditionally 4ply) 19-22. Sport weight 15-18.

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