Yarn Weights
Yarn Weight Categories
There are several yarn weight categories, ranging from lace-weight to super bulky, each with its unique properties and characteristics. The Craft Yarn Council has developed a standardized system for categorizing yarn weights, which you can use as a reference when selecting yarn for your crochet projects. Here's a breakdown of the categories and their suggested crochet hook sizes:
Lace (0): This is the thinnest yarn weight, perfect for delicate and intricate projects like doilies, shawls, and lightweight garments. Recommended crochet hook size: 1.5-2.25mm.
Super Fine (1): Also known as fingering weight, this yarn is ideal for lightweight projects with a bit more structure, such as socks, baby items, and lightweight sweaters. Recommended crochet hook size: 2.25-3.5mm.
Fine (2): Sport weight yarn is slightly thicker than super fine, making it a great choice for lightweight garments and accessories, as well as baby blankets and toys. Recommended crochet hook size: 3.5-4.5mm.
Light (3): This category includes DK (double knitting) and light worsted yarns, which are versatile and suitable for a wide range of projects, like scarves, hats, and sweaters. Recommended crochet hook size: 4.5-5.5mm.
Medium (4): Worsted weight yarn is the most commonly used yarn weight for crochet projects, as it provides a good balance of thickness and drape. It's perfect for blankets, scarves, hats, and sweaters. Recommended crochet hook size: 5.5-6.5mm.
Bulky (5): This thicker yarn is ideal for warm and cozy projects, like blankets, scarves, and winter accessories. Recommended crochet hook size: 6.5-9mm.
Super Bulky (6): As the name suggests, this yarn is very thick and perfect for projects that need to be completed quickly, like chunky scarves, cowls, and blankets. Recommended crochet hook size: 9-15mm.
Jumbo (7): The thickest of yarns is the Size 7, Jumbo. Excellent for a super chunky blankets, baskets, pillows and would make a great durable and plush rug for your home, as well. Size 7 yarn works up quickly making it an ideal choice for projects that need to be completed in a hurry! Recommended crochet hook size: 20mm-30mm.
Yarns are categorised by their WPI or wraps-per-inch (literally, how many wraps of yarn around a stick in 1 inch along the length of the stick) so there can be some slight overlap between categories. A high WPI double-knit may be similar to a low WPI aran. When substituting yarns, it is best to compare the length-to-weight characteristics (eg how many yards/metres in 4oz / 100g) as well as the fibres used otherwise it may be challenging to meet the required gauge for a pattern.