Yarn Weight Chart Explained: From Lace to Jumbo

Yarn weight is the single most important number on a yarn label — and the most misunderstood. This guide walks you through the standard 0–7 scale, what each weight feels like, and how thickness changes the yardage your project needs.

What does yarn weight actually mean?

Yarn weight has nothing to do with how heavy a skein is on a scale. It is the thickness of the strand, standardized by the Craft Yarn Council on a scale from 0 (lace) to 7 (jumbo). A 100 g skein of lace weight and a 100 g skein of super bulky weigh exactly the same — but the lace skein holds roughly ten times more yardage.

This matters because patterns are written for a specific thickness. Substitute a thicker or thinner yarn and your finished piece comes out a different size, with a different drape — unless you do the yardage math. Our yarn yardage calculator handles that conversion for you: pick your project and the new yarn weight, and it recalculates the yardage instantly.

The complete yarn weight chart

Here is the full standard scale with typical yardage per 100 g and the projects each weight is best for:

Note that different brands vary, so always check the number printed on your own ball band — our calculator lets you enter the exact yardage per skein. If you are still learning to decode labels, see how to read a yarn label.

How yarn weight changes your yardage

Thicker yarn covers more area per yard, so you need fewer total yards — but each skein also contains fewer yards. That is why a throw blanket takes about 2,200 yards in worsted but only 1,400 yards in super bulky: the super-bulky version is much heavier and uses far more skeins by weight.

Rule of thumb: when you move one weight thicker, total yardage drops by roughly 15–20%. Going thinner does the reverse. The calculator's built-in table already accounts for this per project, so you don't have to estimate by hand.

Choosing the right weight for your project

Match the weight to the job. Garments that drape (sweaters, shawls) work best in fingering through worsted. Hard-wearing items (rugs, bags) want bulky and up. Baby items usually sit in sport to worsted — soft and washable beats everything else. And remember that crochet eats about 25–30% more yarn than knitting for the same size; read crochet vs knitting: which uses more yarn before you buy.

Yarn weight vs. WPI (wraps per inch)

WPI — wraps per inch — is the old-school way to measure thickness: wrap the yarn around a ruler and count how many wraps fit in one inch. Lace is 30+ WPI, fingering 19–22, DK 15–18, worsted 12–14, bulky 9–11. The Craft Yarn Council scale replaced WPI on modern labels, but spinners and vintage-pattern users still speak WPI — if a vintage pattern says “18 WPI”, that is modern DK.

WPI is also handy for mystery skeins with no label: wrap, count, and match to the chart above. Then sanity-check with the calculator — pick your project, enter the weight you estimated, and compare the yardage against what you actually have on hand.