Free crochet tools for makers: convert UK to US crochet terms in one click, find the right hook size for your yarn, and check the yarn weight chart.
UK to US Crochet Terms Converter
Paste any crochet pattern written in UK terms and get it instantly in US terms (or the other way around).
US vs UK crochet terms cheat sheet
| US term | UK term |
|---|---|
| Slip stitch (sl st) | Slip stitch (ss) |
| Single crochet (sc) | Double crochet (dc) |
| Half double crochet (hdc) | Half treble crochet (htr) |
| Double crochet (dc) | Treble crochet (tr) |
| Treble crochet (tr) | Double treble crochet (dtr) |
| Double treble crochet (dtr) | Triple treble crochet (trtr) |
| Yarn over (yo) | Yarn round hook (yrh) |
| Skip | Miss |
| Gauge | Tension |
Crochet hook size chart (mm to US)
| Metric (mm) | US size |
|---|---|
| 2.25 mm | B-1 |
| 2.75 mm | C-2 |
| 3.25 mm | D-3 |
| 3.5 mm | E-4 |
| 3.75 mm | F-5 |
| 4 mm | G-6 |
| 4.5 mm | 7 |
| 5 mm | H-8 |
| 5.5 mm | I-9 |
| 6 mm | J-10 |
| 6.5 mm | K-10½ |
| 8 mm | L-11 |
| 9 mm | M/N-13 |
| 10 mm | N/P-15 |
| 15 mm | P/Q |
| 16 mm | Q |
| 19 mm | S |
Yarn weight chart & recommended hook
| CYC # | Category | Also called | Recommended hook |
|---|---|---|---|
| 0 | Lace | Thread, cobweb | 1.5–2.25 mm |
| 1 | Super fine | Sock, fingering, baby | 2.25–3.5 mm (B-1 to E-4) |
| 2 | Fine | Sport, baby | 3.5–4.5 mm (E-4 to 7) |
| 3 | Light | DK, light worsted | 4.5–5.5 mm (7 to I-9) |
| 4 | Medium | Worsted, aran, afghan | 5.5–6.5 mm (I-9 to K-10½) |
| 5 | Bulky | Chunky, craft, rug | 6.5–9 mm (K-10½ to M/N-13) |
| 6 | Super bulky | Super chunky, roving | 9–15 mm (M/N-13 to Q) |
| 7 | Jumbo | Jumbo, roving | 15 mm and larger (Q and up) |