What is worsted weight yarn?
Worsted weight is the most popular yarn weight, a medium, category 4 yarn. Its gauge, needle size, what to make with it, and how it compares to aran and DK.
By Julia WallinKnyt Co-founder and editor
Worsted weight yarn is a medium-thickness yarn in category 4 of the standard yarn weight system. It is one of the most popular and beginner-friendly weights, especially in North America. It knits to a gauge of about 16 to 20 stitches per 4 inches on 4.5 to 5.5 mm (US 7 to 9) needles. Thick enough to work up quickly but fine enough for most garments, worsted is the weight most patterns and beginners start with.
Worsted weight at a glance
| Spec | Value |
|---|---|
| Category number | 4 (Medium) |
| Also called | Afghan, Aran (at the heavier end) |
| Knit gauge | 16 to 20 sts / 4 in (stockinette) |
| Recommended needle | 4.5 to 5.5 mm (US 7 to 9) |
| Recommended crochet hook | 5.5 to 6.5 mm (US I-9 to K-10½) |
| Best for | Sweaters, hats, scarves, blankets, amigurumi |
Source: Craft Yarn Council Standard Yarn Weight System.
What to make with worsted weight
Worsted is the all-round weight. It suits jumpers, beanies, scarves, mittens, blankets and homeware. It is the usual recommendation for learning because the stitches are easy to see and it knits up quickly enough to keep you going. If a pattern does not specify a weight and you are choosing yourself, worsted is rarely a wrong choice.
Worsted vs aran vs DK
This is the most common source of confusion:
- DK (category 3) is thinner than worsted. It is common in UK and European patterns.
- Worsted (category 4) is the US "medium" standard.
- Aran (also category 4) sits at the thicker end of medium, often a little heavier than worsted.
Because aran and worsted share category 4 and overlap, always check the gauge on the label rather than trusting the name, especially when substituting. → Full yarn weights chart
A note on "worsted" the word
"Worsted" has two meanings. As a weight, it means medium category 4 yarn (the sense used here). As a spinning method, "worsted-spun" describes how the fibres are prepared, regardless of thickness. On a yarn label, "worsted" almost always refers to the weight.
Frequently asked questions
What is worsted weight yarn?
A medium-thickness category 4 yarn, one of the most common weights, especially in North America. It knits to roughly 16 to 20 stitches per 4 inches on 4.5 to 5.5 mm (US 7 to 9) needles. It suits most everyday projects.
Is worsted the same as aran?
Both are category 4 (medium), but aran is usually slightly thicker and heavier than standard worsted. Check the label's gauge before substituting one for the other.
What needle size do I use for worsted weight yarn?
4.5 to 5.5 mm (US 7 to 9) is the recommended range. Always knit a gauge swatch and adjust to match your pattern's gauge.
What is worsted weight in UK terms?
There is no exact UK name. Worsted sits between UK DK and aran, closest to aran but a little finer. UK patterns more often call for DK or aran than "worsted".
Is worsted weight good for beginners?
Yes. It is the most recommended beginner weight because it is easy to see, easy to handle, and knits up quickly.
Co-founder and editor of Knyt. Avid knitter!
