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Stitch & size conversion charts
Craft patterns speak two languages. A stitch with one name in an American pattern has a different name in a British or Aussie one, hook and needle sizes run on three different number systems, and yarn weights change their names at every border. These are the charts we use ourselves, all in one place — bookmark this page and it’ll save you a lot of squinting.
Crochet terms — US to UK
Same stitches, different names. If your pattern’s stitches seem to be coming out taller than the picture, this table is usually why.
| US term | UK / Aussie term |
|---|---|
| chain | chain |
| slip stitch | slip stitch |
| single crochet | double crochet |
| half double crochet | half treble crochet |
| double crochet | treble crochet |
| treble (triple) crochet | double treble crochet |
| double treble crochet | triple treble crochet |
| yarn over | yarn over hook |
| gauge | tension |
| skip | miss |
Crochet hook sizes
| Metric (mm) | US | Old UK |
|---|---|---|
| 2.25 | B-1 | 13 |
| 2.75 | C-2 | 12 |
| 3.25 | D-3 | 10 |
| 3.5 | E-4 | 9 |
| 3.75 | F-5 | 8 |
| 4.0 | G-6 | 8 |
| 4.5 | 7 | 7 |
| 5.0 | H-8 | 6 |
| 5.5 | I-9 | 5 |
| 6.0 | J-10 | 4 |
| 6.5 | K-10½ | 3 |
| 8.0 | L-11 | 0 |
| 9.0 | M-13 | 00 |
| 10.0 | N/P-15 | 000 |
Metric millimetres are the only exact measure on the chart — the letter and number systems are near enough, not spot on. If a pattern matters, trust the mm.
Knitting needle sizes
| Metric (mm) | US | Old UK |
|---|---|---|
| 2.0 | 0 | 14 |
| 2.25 | 1 | 13 |
| 2.5 | 1½ | — |
| 2.75 | 2 | 12 |
| 3.0 | 2½ | 11 |
| 3.25 | 3 | 10 |
| 3.5 | 4 | — |
| 3.75 | 5 | 9 |
| 4.0 | 6 | 8 |
| 4.5 | 7 | 7 |
| 5.0 | 8 | 6 |
| 5.5 | 9 | 5 |
| 6.0 | 10 | 4 |
| 6.5 | 10½ | 3 |
| 7.0 | — | 2 |
| 7.5 | — | 1 |
| 8.0 | 11 | 0 |
| 9.0 | 13 | 00 |
| 10.0 | 15 | 000 |
A dash means there’s no exact old-UK or US equivalent for that size — another reason the millimetres are your best friend.
Yarn weights
| Standard name | Aussie ply | Typical needle | Typical hook | Guide stitches per 10 cm (stocking stitch) |
|---|---|---|---|---|
| Lace | 1–2 ply | 1.5–2.25 mm | 1.6–2.25 mm | 33–40 |
| Fingering / Super Fine | 3–4 ply | 2.25–3.25 mm | 2.25–3.5 mm | 27–32 |
| Sport / Fine | 5 ply | 3.25–3.75 mm | 3.5–4.5 mm | 23–26 |
| DK / Light | 8 ply | 3.75–4.5 mm | 4.5–5.5 mm | 21–24 |
| Worsted–Aran / Medium | 10 ply | 4.5–5.5 mm | 5.5–6.5 mm | 16–20 |
| Bulky / Chunky | 12 ply | 5.5–8 mm | 6.5–9 mm | 12–15 |
| Super Bulky | 14 ply+ | 8–12.75 mm | 9–15 mm | 7–11 |
| Jumbo | — | 12.75 mm+ | 15 mm+ | 6 or fewer |
One Aussie wrinkle: “ply” here is a thickness guide, not a count of the strands in the yarn — modern yarns are spun all sorts of ways. Whatever the ball band says, always work the pattern’s tension (gauge) square before you commit to a whole garment.
Quick measures
- 1 inch = 2.54 cm
- 1 yard ≈ 0.91 metres
- 1 ounce ≈ 28 grams
And once your sizes are sorted, our Stitch Library walks you through the techniques themselves, stitch by stitch.
