Yarn Weight Chart & Converter
Find your yarn's weight from its label, pick the right hook, and translate US and UK patterns.
What weight is my yarn?
Yarn weight chart
| # | US name | UK / AU name | Hook size | Yards per 100 g | WPI |
|---|---|---|---|---|---|
| 0 | Lace, thread | 1–2 ply | 1.5–2.25 mm | 600+ | 30–40+ |
| 1 | Fingering, sock | 4 ply | 2.25–3.5 mm | 380–600 | 14–30 |
| 2 | Sport, baby | 5 ply | 3.5–4.5 mm | 300–380 | 12–18 |
| 3 | DK, light worsted | DK, 8 ply | 4.5–5.5 mm | 230–300 | 11–15 |
| 4 | Worsted, aran | Aran, 10 ply | 5.5–6.5 mm | 160–230 | 9–12 |
| 5 | Bulky, chunky | Chunky, 12 ply | 6.5–9 mm | 100–160 | 6–9 |
| 6 | Super bulky | Super chunky | 9–15 mm | 45–100 | 5–6 |
| 7 | Jumbo | Jumbo, roving | 15 mm+ | under 45 | 1–4 |
Approximate ranges; brands differ. WPI = wraps per inch: wrap the yarn around a ruler without stretching and count the wraps in one inch.
Crochet hook size converter
US vs UK crochet terms
UK patterns name each stitch one step higher than US patterns. The stitches themselves are the same.
| US term | UK term |
|---|---|
| Slip stitch (sl st) | Slip stitch (ss) |
| Single crochet (sc) | Double crochet (dc) |
| Half double crochet (hdc) | Half treble (htr) |
| Double crochet (dc) | Treble (tr) |
| Treble (tr) | Double treble (dtr) |
| Double treble (dtr) | Triple treble (trtr) |
| Skip | Miss |
| Gauge | Tension |
| Yarn over (yo) | Yarn round hook (yrh) |
Tip: if a pattern uses "sc" anywhere, it's written in US terms. UK patterns have no single crochet.
Frequently asked questions
What is worsted weight yarn in the UK?
Worsted (category 4) is closest to UK aran (10 ply). UK DK is a little thinner and matches US light worsted (category 3).
Can I substitute DK for worsted?
Sometimes, with a bigger hook, but the fabric will be thinner and the size may change. Always swatch and check with the gauge calculator.
Is UK double crochet the same as US double crochet?
No. UK double crochet is US single crochet, and UK treble is US double crochet.