You found the perfect DK yarn on sale, but your pattern calls for worsted. Can you use it? Often, yes. You just need to know what changes.
The short answer
- Blankets, scarves, shawls, cowls: go for it. You’ll get a slightly lighter, drapier fabric. Add stitches or go up a needle size to keep the size.
- Sweaters, socks, fitted hats: be careful. A different gauge changes the size of every piece, so you’ll need to recalculate stitch counts or pick a pattern written for DK.
What actually changes
| DK (#3) | Worsted (#4) | |
|---|---|---|
| Knit gauge per 4 in | 21–24 sts | 16–20 sts |
| Typical needle | 3.75–4.5 mm (US 5–7) | 4.5–5.5 mm (US 7–9) |
| Typical hook | 4.5–5.5 mm (7 to I-9) | 5.5–6.5 mm (I-9 to K-10½) |
| Typical length per 100 g | about 250 yd | about 200 yd |
Gauge and needle ranges are from the Craft Yarn Council’s standard yarn weight system. Yardage varies a lot by brand, so always check your label.
How much DK yarn do you need?
Thinner yarn covers less area per yard, so the same size piece takes more length. Going from a typical worsted (200 yd per 100 g) to a typical DK (250 yd per 100 g), you’ll need roughly 12% more yards. A blanket that takes 1,000 yards of worsted needs about 1,120 yards of DK.
That’s an estimate. Your own tension and the fiber matter too, so add 10% and buy everything from the same dye lot. The yarn substitution calculator works this out from the numbers on your two labels.
Free calculatorYarn substitutionCheck my yarn swap →Two ways to make the swap work
- Keep the pattern’s size: knit a swatch in DK with the needle that gives fabric you like, then use the blanket size calculator (or simple math) to find the new stitch count.
- Hold DK double: two strands of DK together usually lands around aran to chunky, depending on the yarn. Swatch it, since it may come out thicker than worsted.
Questions
Can I use worsted instead of DK?
Same idea in reverse. The fabric gets thicker and the piece gets bigger unless you cast on fewer stitches. You’ll need fewer yards overall, but often more skeins, because worsted skeins tend to hold less length.
Is DK the same as light worsted?
They’re in the same category (#3, Light) in the Craft Yarn Council system, so they’re often used interchangeably. Check the gauge on the label to be sure.
Is 8-ply the same as DK?
In Australia and New Zealand, 8-ply usually means DK weight. Ply names don’t always match thickness, though, so compare the suggested gauge on the label.