Yarn weight refers to the thickness of yarn used by knitters, weavers, crocheters and other fiber artists. Changing yarn weight or needle size can have a significant impact on the finished project, so standardized systems have been spread about, as well as conversion systems for regional standards (especially needle sizes).Yarn weight is important in achieving the correct gauge or tension for a particular project and can help with yarn substitution. The Craft Yarn Council of America has developed a system that seeks to standardize the labeled weights of yarn. Most yarns state their weight on the ball band. Some brands use a standardized numbering system that uses 7 ranges of relative thickness of yarn.
One way of determining the weight of an unknown yarn is to use the wrapping method.
Wrap the yarn around a large needle or a ruler. Make sure the yarn lies flat. Push the yarn together so there are no gaps between wraps. Smooth it out so it is neither too loose nor too tight. Measure the number of wraps per inch (2.5 cm). For better accuracy, measure the wraps at the center of your yarn sample.
|USA ||UK ||Australia ||Germany ||m/100g ||Wraps Per Inch,||Recommended knitting needle size, mm,||Recommended crochet hook size, mm ||Other terms used,|
|0 or Lace||1 ply||40+ wpi||1.5 - 2.5||1.5 - 2.5||Single, Cobweb, Thread, Zephyr|
|0 or Lace||2 ply||2 fadig (ply)||600-800||30-40 wpi||1.5 - 2.5||1.5 - 2.5|
|1 or Super Fine||3 ply||3 ply||3 fadig||400-480||20-30 wpi||2 - 3||2.25 - 3.5||Light Fingering, Sock, Baby|
|1 or Super Fine||4 ply||4 ply||4 fadig||400-480||14-24 wpi||2 - 3||2.25 - 3.5||Fingering, Sock, Baby|
|2 or Fine||5 ply||6 fadig||300-400||12-18 wpi||3 - 4||3.5 - 4.5||Sport, Baby, 3-ply (obsolete American)|
|3 or Light||DK (Double Knit) or 8 ply||8 ply||240-300||11-15 wpi||4 - 4.5||4.5 - 5.5||Light Worsted|
|4 or Medium||Aran, Triple Knit (rare)||10 or 12 ply||120-240||9-12 wpi||4.5 - 5.5||5.5 - 6.5||Worsted, Afghan, Fisherman, 4-ply (obsolete American)|
|5 or Bulky||Chunky, Double Double Knit (rare)||12 or 16 ply||100-130||6-8 wpi||5.5 - 8||6.5 - 9||Craft, Rug|
|6 or Super Bulky||Less than 100||5-6 wpi||>8||>9||Roving|
|7 or Jumbo||Less than 100||n/a||12.75 mm and larger||15 mm and larger||Roving|
The following equation may be used to determine the weight of warp and weft required for a particular fabric:
- Weight of warp = (0.65 x qty. of fabric (metres) x no. of warp ends) / count
If there are two colors in the warp, use the following equations:
- Weight of color A (kg) = (0.65 x qty. of fabric (metres) x no. of warp ends of color A) / count of color A
- Weight of color B (kg) = (0.65 x Qty. of fabric (metres) x no. of warp ends of color B) / count of color B
If the counts of two warps are the same:
- Weight of color A (kg) = (total weight of warp reqd. x no. of ends of color A) / total no. of warp ends
- Weight of color B (kg) = (total weight of warp reqd. x no. of ends of color B) / total no. of warp ends
- Weight of color (B) = total weight of warp reqd. - weight of color A
- Weight of weft = (0.6 x qty. of fabric (metres) x PPI x reed space) / count
If there are two colors in the weft:
- Weight of color A (kg) = (0.6 x qty. of fabric (metres) x PPI of color A x reed space) / count of color A
- Weight of color B (kg) = (0.6 x qty. of fabric (metres) x PPI of color B x reed space) / count of color B
- Weight of color (B) = total weight of weft reqd. - weight of color A
- Another formula
- Reed x width / 7000 = Ans
- Ans x quantity (mtr) / count = The weight required (Kg)
- "Knitbuddies Chrochet and Knitting Needle Conversion Charts".
- The CYC weight system can be found at http://www.craftyarncouncil.com/weight.html
- "Standard Yarn Weight System | Welcome to the Craft Yarn Council". craftyarncouncil.com. Retrieved 2014-07-12.
- "Knitting Stuff - Conversion Tables". knitting.stuff.freeuk.com. Retrieved 2014-07-12.
- "Learn the Basics". crochetaustralia.com.au. Retrieved 2014-07-12.
- "Schachenmayr | Yarn, Knitting Patterns, Crochet Patterns". us.schachenmayr.com. Retrieved 2014-07-12.
- "Yarn Comparison Chart". knitting-naturally.com. Retrieved 2014-07-12.
- J Snell (1 December 2010). "The Standard Yarn Weight System Handy Chart" (PDF). Spinderella’s Fiber Mill. Retrieved 2014-07-12.
- "Hand Knitting Yarn Sizes - there is no truly meaningful size system". paternoster.orpheusweb.co.uk. Retrieved 2014-07-12.