What is DK yarn?

DK is the yarn weight you'll see on more British patterns than any other, and for good reason. It's thick enough to grow quickly, fine enough for fitted jumpers and baby cardigans, and it comes in every fibre from budget acrylic to cashmere blends. If a pattern just says "DK" and you're not quite sure what you're buying, this guide covers it.

What does DK stand for?

DK stands for double knit. The name dates back to when yarn was sold by ply: a DK was roughly two strands of 4 ply worked together, so it knits up about twice as thick. Today ply count doesn't tell you much (plenty of DK yarns are single-ply or chainette), and DK is simply a weight category. You'll also see it called 8 ply in Australia and New Zealand, and light worsted or Category 3 - Light by the Craft Yarn Council in the US.

DK yarn at a glance

• Standard tension: around 22 stitches and 28–30 rows to 10cm in stocking stitch
• Knitting needles: 3.75–4.5mm (US 5–7), with 4mm the most common
• Crochet hook: 3.5–5.5mm, usually 4mm
• Metres per 50g: roughly 100–140m for wool and cotton; acrylics often run longer
• Also known as: double knit, 8 ply, light worsted, CYC 3 (light)

Those numbers come straight off the ball bands we stock. Paintbox Yarns Simply DK, King Cole Merino Blend DK and Sirdar Cashmere Merino Silk DK all list a 4mm needle and a 4mm hook, with a stated tension of 22 stitches to 10cm. That consistency is exactly why DK is so easy to substitute.

DK vs 4 ply, aran and worsted

DK sits in the middle of the yarn weight scale, which is why it gets compared with everything.

DK vs 4 ply

4 ply is finer, knitting to about 28 stitches per 10cm on 3–3.5mm needles. Choose 4 ply for socks, lightweight shawls and very fine baby things. Swap to DK and the fabric grows quickly: the same stitch count gives you a piece roughly 25% wider.

DK vs aran

Aran is the next weight up, working to roughly 18 stitches per 10cm on 5mm needles. While a DK jumper drapes softly and layers easily under a coat, an Aran knit has the structure to stand on its own. If you love an Aran pattern but want a lighter garment, choose a DK-specific pattern instead of sizing up your needles—knitting DK on larger needles results in a loose, gappy fabric.

DK vs worsted

Here’s where yarn weights get tricky. Worsted is the go-to term for American medium weight yarn, bridging the gap between DK and Aran: it gives you a bit more substance than a classic DK without reaching the full bulk of a British Aran. Some US patterns written for "light worsted" will work in a DK, but always swatch first. Our guide to worsted weight yarn goes into this in more detail.

Want the full picture? See every yarn weight side by side.

Which fibre to choose

Because DK is so popular, you get more fibre choice in this weight than any other. Here's how they behave once they're on the needles or hook.

Acrylic DK

Machine washable, hard-wearing and kind to the budget, which makes it the go-to for blankets, kids' clothes and anything that will see a lot of the washing machine. Paintbox Yarns Simply DK is our own brand and is designed so that every shade in the range sits happily next to every other, which makes it a favourite for granny squares and striped blankets.

Wool and merino DK

Wool has memory: it springs back after blocking and holds cables and texture beautifully. King Cole Merino Blend DK is superwash, so it goes in the machine, and it's a great first wool for a jumper. For colourwork, Cascade 220 Superwash Merino has a huge shade range. Note that it sits at the heavier end of DK (20 stitches per 10cm), so swatch before you commit.

Cotton DK

Cotton has no stretch and no halo, so every stitch looks crisp. That makes it ideal for amigurumi, dishcloths, summer tops and anything you want to hold its shape. Paintbox Yarns Cotton DK is the one we reach for. Expect your hands to work a little harder than with wool, and try going down half a needle size if your fabric looks loose.

Luxury blends

For a special gift or a baby heirloom, Sirdar Cashmere Merino Silk DK adds drape and a soft sheen while staying machine washable at 40°C.

What to make with DK yarn

Almost anything, honestly, but these are the projects where DK really shines:

• Jumpers and cardigans: warm without being bulky, and the weight most British garment patterns are written for
• Baby clothes and blankets: soft, quick and easy to wash (see our baby yarn picks)
• Amigurumi and toys: use cotton or acrylic DK on a slightly smaller hook so the stuffing doesn't show
• Hats, scarves and mittens: quick enough to finish in a weekend
• Blankets and granny squares: DK keeps a blanket light enough to actually use

Browse DK knitting patterns and DK crochet patterns to find your next project.

Pro tips for knitting and crocheting with DK

• Swatch every time you change fibre. Two yarns labelled DK can still work up differently: cotton tends to grow in length, while wool blooms after washing.
• When substituting, match metres per 100g as well as weight. It tells you whether you'll need more or fewer balls.
• Buy enough from the same dye lot. For a jumper, add one extra ball to whatever the pattern asks for.
• If you find yourself between needle or hook sizes, choose the one that produces a fabric you love. The tension on the ball band is a starting point, not a rule.

DK yarn FAQs

Is DK the same as 8 ply?

Yes. 8 ply is the Australian and New Zealand name for DK weight.

Is DK yarn good for beginners?

Yes, it's one of the best places to start. It's thick enough to see your stitches clearly and works up quickly on a 4mm needle or hook, and there are more beginner patterns written for DK than for any other weight.

Can I use DK instead of worsted?

Sometimes. DK is a little thinner, so you may need to go up a needle size and check your tension carefully. For garments, it's safer to choose a pattern written for DK.

How many balls of DK do I need for a jumper?

An adult jumper usually takes 8–14 50g balls, depending on size, length and fibre. Always go by the pattern's metreage rather than the number of balls.