Yarn Weight Converter
Convert yarn weights between standard categories, UK/Australian ply, wraps per inch, and typical hook or needle ranges. Helpful when a pattern uses a different yarn system than the label in your stash.
Convert a yarn weight
Choose the measurement you know. The closest yarn category and common equivalents update instantly.
8 ply is usually closest to 3 Light / DK yarn, around 11–15 WPI.
How to use the yarn weight converter
- Pick the measurement you have: yarn category, ply, WPI, needle size, or hook size.
- Enter the value from your yarn label, pattern, or ruler test.
- Use the closest result as a shopping or stash-matching guide.
- Make a swatch before changing yarn in garments, fitted hats, socks, or anything where size matters.
Yarn weight conversion chart
| Standard | Common names | Ply | WPI | Needles | Hooks |
|---|
Yarn weight conversion FAQ
Is 8 ply the same as DK?
Most 8 ply yarn is close to DK or light worsted weight. Brands vary, so check the recommended needle or hook size and swatch if the finished size matters.
What yarn weight is 4 ply?
4 ply is usually close to fingering or super fine yarn. It is common for socks, lightweight shawls, baby garments, and fine crochet projects.
Can I substitute worsted for DK?
Sometimes, but worsted is usually thicker than DK. Your project may come out larger or firmer unless you adjust needle size, hook size, stitch count, or pattern gauge.