What Is Worsted Weight Yarn? A Complete Guide
Worsted weight yarn is the #4 “medium” weight — the everyday sweater, hat, and blanket yarn that shows up most frequently in patterns.
Most stitchers live and breathe in the land of worsted weight yarn: it’s the default in most patterns, the yarn shops stock the most of, and a beginner’s best friend. In this guide, we’ll first answer “what is worsted weight yarn?” in detail before unpacking dk vs worsted and aran vs worsted. Then we’ll cover the details on needles, hooks, and gauge before exploring what you can make with worsted yarn — and what makes ours so special.
What Is Worsted Weight Yarn?
New stitchers commonly pepper us with questions (what number is worsted weight yarn? what size is worsted weight yarn? what does worsted weight mean?), and we’re here to answer: Worsted weight yarn is the #4 (Medium) on the Craft Yarn Council scale — and typically delivers 16–20 stitches per 4 inches on US 7–9 needles. Most patterns actually assume you’re using worsted, and it’s the yarn most stitchers learn on. (Seriously, if you’ve ever been handed ‘just some yarn’ and a pair of US 8s, I’ll bet you money it was probably worsted!) The origin of the name itself is interesting: originally, “worsted” was a term describing a smooth, combed-wool spinning method named for the village of Worsted (now Worstead) in England — and today (albeit confusingly) it also describes the popular yarn weight we all know and love.
Worsted vs DK vs Aran: How to Tell Them Apart
These are the three yarn weights that often get confused, so let’s unpack the basic differences:
DK (#3) vs Worsted
DK yarn is one step lighter than Worsted — we made this helpful DK Weight Yarn Guide if you’d like to take a deeper dive.
Aran vs Worsted
Even though aran yarn sits in the same #4 category on the US scale, the UK version of #4 runs slightly heavier than worsted. UK patterns may say “aran” where a US pattern says “worsted,” so it’s always a good idea to swatch before you dive into your project. Feel free to browse our Aran Tweed Weight Yarn collection to see our selection, and read our Tweed Yarn Guide if you want to learn more.
“Light Worsted” vs Worsted
Light worsted is a term some brands use for the heavy end of DK (#3), the weight that is one step lighter than Worsted.
A quick note: If you need a helpful comparison key for yarn weights from the US vs UK, check out this helpful conversion chart.
A fast test: wraps per inch
The gauge on the label is something only a few big box store companies will do. Wraps per inch is a way that people can get an idea of gauge without making a swatch. You basically wrap a strand of yarn around a standard ruler and how many times it can wrap around in an inch will determine gauge. My understanding is that it gives you a better idea of the feel of the yarn and what kind of fabric it will produce (aka: thicker or thinner yarn) vs. help make sure your finished project will be the right size; which is what a knit swatch would tell you.
Needles, Hooks and Gauge for Worsted Weight
What size knitting needles for worsted weight yarn?
Knitting needles US 7–9 (4.5–5.5 mm)
What size crochet hook for worsted weight yarn?
Crochet hooks I-9 to K-10½ (5.5–6.5 mm)
What’s a typical gauge for worsted weight wool yarn?
A typical gauge is 16–20 stitches over 4 inches. A range will definitely serve you better than a concrete number, since the number of stitches will be affected by fabric preference. Plus, hand-dyed yarns vary skein to skein — an adventure, not a drawback — which is why we always recommend swatching before starting any project. Speaking of which, every Bad Sheep Yarn colorway has knit and crochet swatch photos, so you can see the finished look before you cast on. Plus, our studio will match your skeins for you.
What to Make with Worsted Weight Yarn
Here’s our simple everyday list, ordered by how much yarn each project typically needs:
- Hats and mittens (one skein each)
- Cowl (one to two)
- Scarf (two to three)
- Blanket (sooo many; at least 11-18, but check a guide like this for help)
- Sweater (see our handy How to Knit a Sweater Guide)
Our big tip for beginners: buy one skein more than the pattern says, and alternate skeins on anything bigger than a hat (a quick dip into our Variegated Hand-Dyed Yarn Guide will explain why).
Our Worsted: 100% Superwash Merino, 218 Yards
Our worsted weight wool yarn is lofty and squishy, with stitch definition that makes cables and textured stitches pop. It’s also technically machine-washable (cold + delicate cycle) because it’s superwash, though we always recommend hand-washing your projects for peak longevity.
The base of our worsted weight yarn is 100% superwash merino — it is 4-ply, measures 218 yards (199 meters), and weighs in at 100 grams. You’ll need US 7–9 needles if you’re knitting, and I-9 to K-10 hooks if you’re crocheting.
Feeling inspired? Find your next stash in our beloved Worsted Collection — where there’s everything from deep, juicy hues and storybook-haunted skeins to light, frothy pastels and nature-inspired colorways.
And if you’re curious about our other types of yarn (and/or you like nerding out over specs like us!), our Fiber Information page is just for you.
Worsted is the weight you’ll come back to again and again. Embrace it — there’s a good reason it’s so popular. When you’re ready, find the colorway that calls to you: Explore the wonderful Worsted Collection.
FAQ
What number is worsted weight yarn?
Worsted weight yarn is #4 (Medium).
Is worsted weight the same as aran?
No — even though aran yarn sits in the same #4 category on the US scale, the UK version of #4 runs slightly heavier than worsted. UK patterns may say “aran” where a US pattern says “worsted,” so it’s always a good idea to swatch before you dive into your project.
What size needles do I use for worsted weight yarn?
Use US 7–9 needles for knitting with worsted weight yarn. If you’re crocheting, use I-9 to K-10 hooks.
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