Yarn Weights Explained: The Complete Yarn Weight Chart for Crochet
CROCHET BASICS · YARN
🧶 Yarn Weights Explained
From lace to jumbo — how to choose the right yarn for every crochet project
“Worsted”, “DK”, “aran”, “sport”, “4-ply”… If yarn labels feel like a foreign language, you are not alone. Yarn weight is simply a way of describing how thick a strand of yarn is, and it is one of the most important things to get right before you start any crochet project. Choose the right weight and your project comes out the size and texture you expected. Choose the wrong one and even a perfect pattern can fail.
In this guide I explain the standard yarn weight system, the different names used in the US, UK and Australia, which projects suit each weight, and how to substitute one yarn for another without surprises.
What Does “Yarn Weight” Mean?
Despite the name, yarn weight has nothing to do with how heavy a ball is. A 100 g ball of thin yarn and a 100 g ball of chunky yarn weigh the same — but the thin one is much longer. Yarn weight describes the thickness of the strand, which decides how big your stitches are and which hook you should use.
To make things clearer, the Craft Yarn Council created a standard system that numbers yarn from 0 (thinnest) to 7 (thickest). Many labels now show this number inside a small ball-of-yarn symbol.
Yarn Weight Chart: Numbers, Names and Hooks
| # | US name | UK / AU name | Hook (mm) | Typical projects |
|---|---|---|---|---|
| 0 | Lace / thread | 1–2 ply | Steel – 2.25 | Doilies, fine lace |
| 1 | Super fine / fingering | 3–4 ply | 2.25 – 3.5 | Socks, baby items, shawls |
| 2 | Fine / sport | 5 ply | 3.5 – 4.5 | Light garments, baby blankets |
| 3 | Light / DK | 8 ply / DK | 4.5 – 5.5 | Tops, toys, keychains, flowers |
| 4 | Medium / worsted | Aran / 10 ply | 5.5 – 6.5 | Blankets, hats, home décor |
| 5 | Bulky / chunky | Chunky / 12 ply | 6.5 – 9 | Cosy scarves, baskets |
| 6 | Super bulky | Super chunky | 9 – 15 | Quick blankets, rugs |
| 7 | Jumbo | Jumbo | 15 + | Arm-crochet, giant throws |
You can find the matching hook sizes explained in detail in my crochet hook sizes chart.
💡 A small warning about names
“Ply” originally meant the number of strands twisted together, but today it is only a rough name for thickness. A modern “4-ply” yarn can be made of two strands or six. Always check the number (0–7), the recommended hook and the metres per 100 g on the label.
The Secret Number on Every Label: Metres per 100 g
The most reliable way to compare two yarns is the length per weight, written as “m / 100 g” or “yds / 3.5 oz”. Two yarns with similar length per 100 g will behave similarly, even if one is called “DK” and the other “light worsted”.
| Weight | Approx. metres per 100 g |
|---|---|
| Fingering (1) | 350 – 450 m |
| Sport (2) | 280 – 350 m |
| DK (3) | 200 – 280 m |
| Worsted / Aran (4) | 150 – 200 m |
| Bulky (5) | 90 – 150 m |
| Super bulky (6) | under 90 m |
These are typical ranges; fibre content changes them slightly (cotton is heavier than acrylic, so cotton balls are often shorter for the same thickness).
The Wraps-Per-Inch Test (WPI)
Found a lovely ball with no label? Wrap the yarn around a pencil or ruler, side by side without overlapping or stretching, for one inch (2.5 cm). Count the wraps:
- 18 + wraps: fingering or thinner
- 12 – 14 wraps: sport / DK
- 9 – 11 wraps: worsted / aran
- 7 – 8 wraps: bulky
- 6 or fewer: super bulky
Which Yarn Weight for Which Project?
Keychains, flowers and small accessories
For letter keychains and small flowers I prefer a DK or light worsted cotton or cotton blend. It shows stitch definition beautifully, holds its shape, and doesn’t pill when the keychain rubs in a bag.
Curtains and wall décor
For hanging pieces like the crochet flower curtain, a light to medium cotton or cotton-acrylic yarn is ideal: heavy enough to hang straight, light enough not to pull the rod or stretch over time.
Blankets
Worsted is the classic choice. Bulky yarn finishes faster, but the blanket will be heavier and use more metres than you might expect.
Baby items
Sport or DK yarn in a soft, washable fibre. Avoid fuzzy yarns that shed for anything a baby could put in their mouth.
How to Substitute a Yarn Safely
- Match the weight number first (for example, both are #3).
- Compare the metres per 100 g — try to stay within about 10 %.
- Consider the fibre: cotton has no stretch and more weight; acrylic is light and springy; wool has memory and warmth.
- Calculate the total length you need: (metres per ball in the pattern) × (number of balls). Buy enough of the new yarn to reach that length, plus one extra ball from the same dye lot.
- Make a gauge swatch and adjust the hook size until it matches the pattern.
Fibres in a Nutshell
| Fibre | Feel | Good for | Watch out for |
|---|---|---|---|
| Cotton | Crisp, cool, matte | Keychains, coasters, summer items, décor | No stretch; heavier; hard on hands |
| Acrylic | Soft, light, springy | Blankets, toys, beginners | Can squeak; may pill |
| Wool | Warm, elastic | Winter wear | Can felt in hot water |
| Blends | Balanced | Almost everything | Check care instructions |
✅ Quick checklist before you buy
Weight number ✔️ Metres per 100 g ✔️ Fibre ✔️ Recommended hook ✔️ Same dye lot for all balls ✔️
🧶 Recommended yarns to start with
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- Worsted (#4) acrylic yarn – the easiest weight for beginners
- DK (#3) cotton yarn – great for keychains, flowers and curtains
- Yarn variety pack – try different weights and colours
- Yarn bowl – keeps the ball from rolling away
Frequently Asked Questions
Is DK the same as worsted?
No. DK (#3) is slightly thinner than worsted (#4). You can sometimes substitute with a hook change, but always check gauge.
Can I hold two strands together to make a thicker yarn?
Yes. Two strands of the same weight held together roughly equal the next one or two weights up — for example, two strands of DK behave close to an aran or bulky yarn.
What is a dye lot?
A batch of yarn dyed at the same time. Colours can differ slightly between lots, so buy all the yarn for one project from the same lot.
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Written by Cozy Stitch Haven
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