Every yarn label lists a weight category, but the numbers on the label (yards and grams) tell you more than the name. A "worsted" label from one brand can have 197 yards per 3 oz; another has 1,020 yards per 16 oz. The yardage per 100g is the number that actually determines how much you'll need for a project.
This guide covers all seven standard weights — what they look like, what needle sizes they use, how much yardage you get per 100g, and which brands are worth knowing.
Needles: 1.5–2.25mm (US 000–1)
WPI: 30+
Yds/100g: 800–1,500+
The finest weight — thinner than thread at the extreme end. Used for intricate lace shawls and heirloom items. Takes longer to knit but produces stunning, delicate fabric. Requires sharp needles and good lighting.
Popular brands: Malabrigo Lace (470 yds/50g), WeCrochet Capra Lace (400 yds/50g), Cascade Heritage Lace
Needles: 2.25–3.25mm (US 1–3)
WPI: 18–22
Yds/100g: 350–500
Often called "sock weight" because it's the standard for knitted socks. Also excellent for lightweight shawls, lacy scarves, and warm-weather garments. High stitch count means fine detail is possible. Most colorwork socks are in this weight.
Popular brands: Knitpicks Stroll (462 yds/100g), Malabrigo Sock (440 yds/100g), Lion Brand Sock (210 yds/50g), Cascade Heritage Silk (437 yds/100g)
Needles: 3.25–3.75mm (US 3–5)
WPI: 16–18
Yds/100g: 250–350
Between fingering and DK — less common but prized for baby items, lightweight cardigans, and summer tops. Produces a fine, drapey fabric that's warmer than fingering but more delicate than DK. Underused and underrated.
Popular brands: WeCrochet Swish Sport (164 yds/50g), Cascade 220 Sport (136 yds/50g), Paintbox Simply Sport (175 yds/50g)
Needles: 3.75–4.5mm (US 5–7)
WPI: 14–16
Yds/100g: 200–250
Popular in Europe and increasingly common in US patterns. Produces a slightly lighter fabric than worsted with better drape — great for garments. Most sweater patterns in UK magazines are DK. Excellent for lightweight blankets that don't become excessively heavy.
Popular brands: Lion Brand Mandala (590 yds/150g), WeCrochet Swish DK (123 yds/50g), Paintbox Simply DK (137 yds/50g), Cascade 220 Superwash Sport
Needles: 4.5–5.5mm (US 7–9)
WPI: 12–15
Yds/100g: 180–220
The de-facto standard weight. Most beginner patterns are written in worsted, most craft store yarns are worsted, and it's the sweet spot between speed and detail. The stitches are large enough to see easily but small enough to produce a warm, dense fabric. Excellent for hats, sweaters, blankets, and almost anything else.
Popular brands: Lion Brand Pound of Love (1,020 yds/454g), Caron Simply Soft (315 yds/170g), Red Heart Super Saver (364 yds/198g), Lion Brand Wool-Ease (197 yds/85g), Malabrigo Rios (210 yds/100g)
Needles: 5.5–8mm (US 9–11)
WPI: 8–10
Yds/100g: 100–150
Works up quickly and produces a cozy, plush fabric. Best for blankets where speed matters, chunky cowls, and quick gift projects. Blanket yarn (Bernat Blanket, etc.) is technically bulky and has become wildly popular for its ultra-soft texture. One skein of Bernat Blanket makes a baby blanket.
Popular brands: Bernat Blanket (220 yds/300g), Caron Chunky Cakes (341 yds/300g), Lion Brand Thick & Quick (106 yds/170g), Paintbox Simply Chunky (109 yds/100g)
Needles: 9–16mm (US 13–19)
WPI: 6–8
Yds/100g: 50–100
The chunkiest standard weight. Projects come together in hours. Popular for arm knitting, extreme chunky blankets, and beginner-friendly quick wins. Needs less yardage than any other weight but costs the most per yard because of how much fiber goes into each foot of yarn.
Popular brands: Bernat Blanket Extra Thick (97 yds/300g), Lion Brand Hometown USA (81 yds/142g), Paintbox Simply Super Chunky (87 yds/100g)
What is the most common yarn weight for beginners?
Worsted weight is the best choice for beginners. The larger stitches are easy to see and count, most beginner patterns are written in worsted, and there is the widest selection of affordable worsted yarns at craft stores (Lion Brand, Caron, Red Heart, Bernat).
What is the difference between DK and worsted weight yarn?
DK (double knit) is lighter and thinner than worsted — typically 200–250 yards per 100g vs. 180–220 yards per 100g for worsted. DK uses needles around US 5–7 (3.75–4.5mm); worsted uses US 7–9 (4.5–5.5mm). DK produces a drapier fabric; worsted is denser and warmer. You'll need 15–25% more yardage in DK for the same project as worsted.
How many yards are in 100g of yarn?
Yardage per 100g varies by weight: lace (800–1,500+ yds), fingering (350–500 yds), sport (250–350 yds), DK (200–250 yds), worsted (180–220 yds), bulky (100–150 yds), super bulky (50–100 yds). Higher yardage per gram means finer, thinner yarn — and more stitches needed to fill the same area.
Can I substitute one yarn weight for another?
Adjacent weights can often be substituted by adjusting needle size, but the yardage required will change significantly. Going up one weight category (e.g., DK to worsted) typically reduces yardage needed by 15–25%. Going down a weight (e.g., worsted to DK) increases yardage by 15–30%. Always check whether you can match the pattern's gauge with your substituted weight.
What does WPI mean in yarn?
WPI stands for wraps per inch — you measure yarn thickness by wrapping it around a ruler for one inch and counting the wraps. Lace is 30+ WPI; fingering is 18–22 WPI; sport is 16–18 WPI; DK is 14–16 WPI; worsted is 12–15 WPI; bulky is 8–10 WPI; super bulky is 6–8 WPI. This lets you compare unlabeled yarn to the standard categories.