Yarn Sizes Explained

Mature glad woman customer picking various yarn

When you are just starting out with knitting or crochet one of the most confusing concepts to understand are yarn and thread sizes. Depending on where you are located, yarns and threads may be referred to by different names. There are even some yarns sizes that are the same size as crochet thread.

To help you understand how yarns are sized and some of the common uses for each size of yarn we have prepared the following table.

IconAlso Known AsCrochet Thread SizeDescription
Lace Yarn IconFingeringSize 10Lace yarn is the same size as size 10 crochet thread. It is very thin and often used to make shawls, doilies, table runners, jewelry, bridal accessories, etc.
Super Fine YarnSock, Fingering, BabySize 3Super fine yarn is lightweight and typically used for baby items, sock patterns, or shawls. Notice that superfine is the same size as size 3 crochet thread.
Fine Yarn SizeSport, Baby Sport weight yarn can be used for items such as socks, wraps, heirloom sweaters, and other delicate accessories.
Light Worsted Yarn SizeLight Worsted, DK Slightly heavier than sport weight yarn, this weight is used for items such as garments, apparel and heavier baby items.
Worsted Yarn SizeWorsted, Afgan, Arun Worsted weight yarn is the most popular size yarn. It is easy to work with and ideal for working up afghans.
Bulky Yarn SizeChunky, Craft, Rug Bulky yarn is about twice as thick as worsted weight. It usually works up quickly when using large needles/hooks, and it’s great to use when making sweaters, scarves, rugs, and throws.
Super Bulky Yarn SizeRoving Super bulky yarn is a thick yarn that is very easy to work with. It is most commonly used for cowls, scarves, and hats.
Jumbo Yarn SizeRoving Jumbo yarn is the thickest yarn weight, added in 2014 to classify the super thick yarns that began to appear on the market. Jumbo yarns are great for arm knitting and work up quickly.
Lyn’s Crafts Yarn Size Chart

As you can see Lace (Size 0) and Super Fine (Size 1) can both be referred to as Fingering size. Super Fine (Size 1) and Fine (Size 2) can both be referred to as baby.

Also of interest is that Lace (Size 0) is the same as size 10 crochet thread and Super Fine (Size 1) is the same size as size 3 crochet thread.

Having a chart like this one as a ready reference helps clarify the terminology associated with yarn sizes and provides a guide for picking the yarn or thread for your next project.

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