Know your international crochet conversions

If you ever search for crochet patterns online, you might come across the pattern you want, but if it originates in the US, do you know which size hook to use, and do you understand the crochet terms? And if you find a gorgeous vintage pattern in a charity shop, are you sure of the sizes? Here's a handy conversion chart.

International hook sizes

International standard (mm)              American sizes                                                 

2.......................................................-

2.25..................................................B/1

2.5...................................................-

2.75..................................................C/2

3.......................................................-

3.25..................................................D/3

3.5....................................................E/4

3.75..................................................F/5

4.......................................................G/6

4.5....................................................7

5.......................................................H/8

5.5....................................................I/9

6.......................................................J/10

6.5....................................................K/10 1/2

7.......................................................-

8.......................................................L/11

9.......................................................M/13

10.....................................................N/15

Crochet terms

UK                                     US

double crochet           single crochet

half treble                 half double crochet

treble                       double crochet

double treble             treble

triple treble               double treble

quadruple treble        triple treble

slip loop                   slip knot

tension                     gauge

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Know your international knitting terms