Yarn Weights
Yarn weight is the single biggest variable in how a project turns out — before fibre, before color, before stitch pattern. Get the weight category right for what you're making and most other decisions (needle size, roughly how much to buy, how long it'll take) fall into place behind it.
The eight categories, at a glance
| CYC # | Category | Typical use |
|---|---|---|
| 0 | Lace | Shawls, fine lace |
| 1 | Super Fine (Fingering/Sock) | Socks, fine shawls, baby items |
| 2 | Fine (Sport) | Lightweight garments, baby items |
| 3 | Light (DK) | Cardigans, fitted sweaters |
| 4 | Medium (Worsted/Aran) | Sweaters, hats, blankets — the general default |
| 5 | Bulky | Fast accessories, textured blankets |
| 6 | Super Bulky | Statement pieces, very fast projects |
| 7 | Jumbo | Arm-knit blankets, extreme-scale accessories |
Each guide below has the full published gauge range, needle/hook sizes, and typical put-up for that weight — this page won't repeat those numbers; go to the specific weight for the real figures.
How to pick a weight for a project you're planning from scratch
Start from how much time you want to spend and how the finished piece needs to behave, not from what happens to be in your stash. A garment that needs to drape close to the body wants a finer weight; a blanket or accessory where speed matters more than refinement can go heavier. If a pattern already specifies a weight, match it rather than substituting on a whim — see the yarn substitution guides before swapping weights on a sized project.
Every guide in this section
- Lace
- Super Fine (Fingering/Sock)
- Fine (Sport)
- Light (DK)
- Medium (Worsted/Aran)
- Bulky
- Super Bulky
- Jumbo
Once you've picked a weight
Head to the Yarn Quantity Estimator to work out how much you'll actually need for your specific project, or the Needle & Hook Size Converter if a pattern lists a tool size in a system you don't have on hand.
FAQ
Is a heavier weight always faster to finish? Generally, yes, since a heavier weight fills the identical area with far fewer stitches — but heavier weights also use more yarn by total weight, so "faster" doesn't always mean "cheaper" or "lighter to carry around while you work."
Can I mix two different weights in one project on purpose? Yes, in projects designed for it — stripes or textured sections sometimes call for a contrast weight deliberately. Outside a pattern that specifically plans for it, mixing weights within one section usually produces an uneven, unintended gauge shift.