Because there are so many different elements to understanding crochet patterns, I’ve decided to break this down into several parts to make it easier to take in. In this first part we’ll be going over yarn weights and hook sizes.
Whenever you first look at a crochet pattern you’ll notice that it will tell you what yarn weight and what size crochet hook(s) you will need for the project. These are really important because if you use the wrong size crochet hook or the wrong weight of yarn, the project you’re making could end up too small, too big, or the stitches could be too close together or too far apart.
So pay close attention to what the pattern requires, and make sure you use the right materials.
Yarn Weights:
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 |
 |
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| Common Names | ||||||
| - Thread - Cobweb - Lace - Fingering |
- Sock - Fingering - Baby |
- Sport - Baby |
- DK - Light Worsted |
- Worsted - Afghan, Aran |
- Chunky - Craft - Rug |
- Bulky - Roving |
| Common Uses | ||||||
| - Lace Knitting | - Light Layettes - Socks |
- Light Sweaters - Baby Items - Accessories |
- Sweaters - Other Garments - Lightweight Scarves |
- Sweaters - Blankets- Outdoor Wear |
- Rugs - Jackets - Blankets |
- Heavy Blankets - Rugs - Sweaters |
| Crochet Guage* Ranges in Single Crochet to 4 inch | ||||||
| 32–42 double crochets | 21–32 sts | 16–20 sts | 12–17 sts | 11–14 sts | 8–11 sts | 5-9 sts |
| Recommended Crochet Hook Size | ||||||
| 1.6–1.4 mm* 6, 7, 8, B–1* (* Steel) |
2.25-3.5 mm B–1 to E–4 |
3.5-4.5 mm E–4 to 7 |
4.5-5.5 mm 7 to I–9 |
5.5-6.5 mm I–9 to K–10.5 |
6.5-9 mm K–10.5 to M–13 |
9 mm and up M–13 and up |
Crochet Hook Sizes:
| Metric (mm) | US | UK/Canada |
| 1.00 mm | - | 10 steel |
| 1.25 mm | - | 8 steel |
| 1.50 mm | - | 7 steel |
| 1.75 mm | - | 5 steel |
| 2.0 mm | - | 14 |
| 2.25 mm | B/1 | 13 |
| 2.5 mm | - | 12 |
| 2.75 mm | C/2 | - |
| 3.0 mm | - | 11 |
| 3.25 mm | D/3 | 10 |
| 3.5 mm | E/4 | 9 |
| 3.75 mm | F/5 | - |
| 4.0 mm | G/6 | 8 |
| 4.5 mm | 7 | 7 |
| 5.0 mm | H/8 | 6 |
| 5.5 mm | I/9 | 5 |
| 6.0 mm | J/10 | 4 |
| 6.5 mm | K/10.5 | 3 |
| 7.0 mm | - | 2 |
| 8.0 mm | L/11 | 0 |
| 9.0 mm | M/N-13 | 00 |
| 10.0 mm | N/P-15 | 000 |
| 15.0 mm | P/Q | - |
| 16.0 mm | Q | - |
| 19.0 mm | S | - |
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Just found this site and it gives me the informataion I have been looking for. TY so much for this info.
[...] wonder about that? What each crochet hook size is good for? Here’s a good answer. LikeBe the first to like this [...]
I am trying to learn how the size of crochet yarn is computed. It is by weight (ozs) or by size of the yarn?
The chart on this post shows numbers from 0 – 6? What do these numbers mean. Where on the labels will I find the numbersize. None of my yarn has this kind of numbering.
If something calls for 9 oz of 0008 of (brand of thread) would bedspread crochet thread work as well?
Hi, I have an old Twilleys of Stamford crochet pattern for a bedspread. It recommends using Twilleys Stalite, or Galaxia 3 or Crysette for the yarn and a size 3.5 crochet hook. Uable to find any of this yarn and unsure as to what I should use, any suggestions would be grateful as I’m getting no-where. Thanks
I recently stumbled upon a pattern that suggests using a size 3.0mm hook, all I can find around my house is a 6.0mm hook. What would I need to change about the patten in order to change the hook size? Thank you so much for your help.