Yarn Weight Chart: Complete Guide to All 8 Yarn Weights

May 18, 2026·9 min read

Quick answer: The Craft Yarn Council defines 8 yarn weights from lace (#0) to jumbo (#7). Worsted (#4) is the most common. The key differences are thickness (measured in WPI), recommended gauge, and needle size. Full chart below. Need yardage math? Try the yarn yardage calculator.

I spent my first year knitting with whatever yarn was on sale, ignoring the number on the label. I ended up with a scarf that could stop a bullet and a baby blanket you could see through. Same pattern. Different yarn weights. That's how much it matters.

The yarn weight system looks confusing because it is — the names overlap, the numbers aren't intuitive, and every country has slightly different terminology. But once you see the full chart, it clicks fast.

The Complete Yarn Weight Chart

This is the reference I wish I'd had when I started. The Craft Yarn Council standardized these categories, and nearly every yarn manufacturer in the US follows them.

Weight	Name	WPI	Gauge (4")	US Needle	Metric Needle	Common Projects
#0	Lace	30+	32–34 sts	000–1	1.5–2.25 mm	Lace shawls, doilies
#1	Super Fine	14–18	27–32 sts	1–3	2.25–3.25 mm	Socks, fingering-weight shawls
#2	Fine	12–14	23–26 sts	3–5	3.25–3.75 mm	Baby clothes, lightweight garments
#3	DK / Light	11–12	21–24 sts	5–7	3.75–4.5 mm	Sweaters, baby blankets
#4	Worsted / Medium	8–11	16–20 sts	7–9	4.5–5.5 mm	Hats, scarves, afghans, sweaters
#5	Bulky	6–8	12–15 sts	9–11	5.5–8 mm	Chunky scarves, rugs, quick blankets
#6	Super Bulky	4–6	7–11 sts	11–17	8–12.75 mm	Arm knitting, thick blankets
#7	Jumbo	1–4	6 sts or fewer	17+	12.75+ mm	Arm-knit throws, giant decor

WPI stands for wraps per inch — wrap the yarn around a ruler and count how many strands fit in one inch. It's the most reliable way to identify an unlabeled yarn, which is why I listed it first.

Notice the jump between bulky (#5) and super bulky (#6). Gauge drops from 12–15 stitches down to 7–11. That's a massive difference in fabric density, and it catches people off guard when substituting yarn.

Understanding WPI (Wraps Per Inch)

WPI is the single most useful measurement when you're staring at a mystery skein from your stash or a thrift store haul with no label. Here's how to measure it.

Wrap the yarn around a pencil or ruler. Don't stretch it tight — just lay each wrap snugly next to the last with no gaps and no overlapping. Count how many wraps fit in one inch.

WPI	Likely Weight
30+	Lace (#0)
14–18	Fingering / Super Fine (#1)
12–14	Sport / Fine (#2)
11–12	DK / Light (#3)
8–11	Worsted (#4)
6–8	Bulky (#5)
4–6	Super Bulky (#6)
1–4	Jumbo (#7)

One thing WPI won't tell you: fiber content. A cotton worsted and a wool worsted have the same WPI but behave completely differently. Cotton has no memory — it stretches and stays stretched. Wool bounces back. That matters more for garments than it does for blankets, but it's worth knowing before you commit 20 hours to a sweater.

Yarn Weight Names vs Numbers

This is where the confusion lives. A single weight can have three or four names depending on who's talking.

Number	Standard Name	Also Called
#0	Lace	Thread, cobweb, lace weight
#1	Super Fine	Fingering, sock yarn, baby weight
#2	Fine	Sport, baby sport
#3	DK / Light	DK (double knitting), light worsted
#4	Medium	Worsted, afghan, aran
#5	Bulky	Chunky, craft, rug yarn
#6	Super Bulky	Roving, super chunky
#7	Jumbo	Giant, extreme

"Aran" is particularly confusing because it's both a yarn weight (roughly #4) and a style of cable-heavy knitting from Ireland. If a pattern says "aran weight," it means worsted-to-heavy-worsted. If it says "aran pattern," it means cables.

"DK" stands for double knitting — not because you knit with two strands, but because it was originally two plies of fingering yarn twisted together. Historical naming at its finest.

When a pattern calls for "worsted weight," look for the #4 symbol on the yarn label. Don't go by the name printed on the skein — some brands call their DK-weight yarn "worsted" because marketing departments don't knit.

Which Yarn Weight Should You Use?

This depends on your project, your patience level, and how soon you want to be done. Here's how I think about it.

Fastest projects (instant gratification): Super bulky (#6) or jumbo (#7). A chunky blanket knits up in a weekend on size 15+ needles. The downside: the fabric is heavy, the yarn is expensive per yard, and drape is nonexistent. Fine for throws. Terrible for garments.

Best all-around weight: Worsted (#4). There's a reason 60% of patterns are written for worsted. It's thick enough to see your stitches clearly, thin enough for wearable garments, and available in every fiber and color. If you're unsure, start here.

Best for wearables: DK (#3) or sport (#2). Lighter fabrics drape better and don't turn a cardigan into a suit of armor. Most commercial sweaters you buy in a store are knit at roughly DK gauge.

Best for socks: Fingering (#1), no contest. It creates a dense, durable fabric that fits inside a shoe. Worsted socks are too bulky for most footwear.

Best for lace: Lace (#0) or fingering (#1). The thin yarn creates delicate, open fabric when knit on larger needles than recommended. A lace shawl in worsted weight just looks like a loose scarf.

The yarn weight calculator can help you figure out substitutions — input your target gauge and it'll suggest compatible weights.

Substituting Yarn Weights

Every knitter eventually needs to swap one weight for another. Maybe the pattern calls for a discontinued yarn, or you found a gorgeous skein that's one weight off. Here's how to handle it.

One weight up or down (e.g., DK instead of worsted): Usually works if you adjust needle size. Going one weight lighter? Drop 1–2 needle sizes. Going heavier? Go up 1–2 sizes. Swatch first — always. Your gauge swatch is your safety net. Learn more about why in my knitting gauge guide.

Two weights apart (e.g., fingering instead of worsted): This rarely works. The fabric characteristics change too much. You'd need to hold multiple strands together or completely recalculate the pattern.

Holding double: Two strands of fingering held together approximate sport weight. Two strands of sport approximate worsted. This is a legitimate technique, but the fabric will be denser and less drapey than a single strand of the heavier weight.

Quick substitution reference:

Original Weight	Substitute Option
Fingering (#1)	2 strands lace held together
Sport (#2)	2 strands fingering held together
DK (#3)	Worsted on smaller needles
Worsted (#4)	DK on larger needles
Bulky (#5)	2 strands worsted held together
Super Bulky (#6)	3 strands worsted held together

Whatever you do, swatch. I cannot stress this enough. A "close enough" substitution without swatching is how you end up with a sweater that fits your dog instead of you.

How Much Yardage Per Weight?

Thicker yarn gives you fewer yards per skein. This matters for budgeting — a bulky blanket might need fewer skeins but cost the same because each skein has less yardage.

Weight	Typical Yardage per 100g
Lace (#0)	400–800 yards
Fingering (#1)	350–450 yards
Sport (#2)	250–350 yards
DK (#3)	200–280 yards
Worsted (#4)	180–220 yards
Bulky (#5)	100–150 yards
Super Bulky (#6)	50–100 yards
Jumbo (#7)	20–60 yards

A fingering-weight shawl might need 800 yards total — that's 2 skeins at 400 yards each. A bulky-weight blanket might need 2,000 yards — that's 15–20 skeins at 120 yards each. The blanket uses more skeins but knits faster. Trade-offs everywhere.

Use the yarn yardage calculator to figure out exactly how many skeins you need for your project. It factors in weight, project type, and your specific gauge.

FAQ

What is the most common yarn weight?

Worsted (#4) dominates the market. Roughly 60% of published patterns call for worsted weight, and it's the default teaching weight at most yarn shops. It's thick enough to work up quickly but thin enough for most projects. If a pattern doesn't specify weight (which happens with older patterns), assume worsted.

Can I use a different yarn weight than the pattern calls for?

Yes, but you must swatch and adjust your needle size. Going one weight up or down usually works — match the pattern's gauge by changing needles. Going two or more weights apart means you'll likely need to recalculate stitch counts entirely. The knitting gauge guide explains how to adjust properly.

What does "ply" mean and how does it relate to weight?

Ply means the number of strands twisted together to form the yarn. A 4-ply yarn has four thin strands twisted into one. But here's the trap: ply doesn't determine weight. A tightly spun 4-ply can be fingering weight, while a loosely spun 4-ply can be DK. In Australia, "8-ply" means DK and "10-ply" means worsted — they use ply as a weight system. In the US, ignore ply count and look at the weight number on the label.

How do I identify yarn with no label?

Wrap it around a ruler to measure WPI (wraps per inch). Compare your count to the WPI chart above. Also do a burn test if you need to identify fiber: wool smells like burning hair and self-extinguishes, cotton smells like burning paper, acrylic melts into a hard bead. Between WPI and burn test, you can classify most mystery yarn in under two minutes.

Is chunky the same as bulky?

Yes. "Chunky" is the British/Canadian term for what the US system calls "bulky" (#5). Same weight, different label. Super chunky = super bulky (#6). The Craft Yarn Council uses "bulky" and "super bulky," but if you're buying UK yarn brands, expect "chunky" on the label.

Next Steps

Use the yarn yardage calculator to figure out how many skeins your project needs based on weight and dimensions.
Check the knitting needle size chart to match your yarn weight to the right needles in US, UK, and metric.
Read the knitting gauge guide to understand how gauge, yarn weight, and needle size work together.