amigurumi, basics/tutorial

Basics: Crochet Hook Conversion

So what’s up with all these different ways of writing hook sizes? Most patterns use metric, US or UK/Canadian way of describing hooks, but I also have some Japanese hooks I never knew the size of. That’s why I made conversion tables showing the different hook sizes and their conversions.

This blog uses the metric way of describing hook sizes, but often I’ll also give you the US/UK sizes.

Normal hooks

95% of the time, I use hooks size 2mm to 4mm, so I’ll just start with those!

Crochet Hook Size Conversion Table
Metric (mm) US UK/CA Japan
2 14 2/0
2.25 B/1 13 3/0
2.5 12 4/0
2.75 C/2
3 11 5/0
3.25 D/3 10
3.5 E/4 9 6/0
3.75 F/5
4 G/6 8 7/0

Thread hooks

Since I like doing mirco-crochet, I made the same table for thread crochet hooks (also called steel hooks). Weirdly enough, an US hook 1 can be either 2.25mm (‘normal’ hooks) or 2mm (steel/thread hooks). The same goes with UK hooks: a size 3 hook can be 6,5mm (‘normal’ hooks) or 1,25mm (steel/thread hooks).

Crochet Hook Size Conversion Table
Metric (mm) US (steel) UK/CA Japan
.6 14 6 10
.7 12 5 6
.8 11
.9
1 10 4 4
1.25 8 3
1.5 7 2.5
1.75 4 2
2 1 1 7/0
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