2 mm crochet hook

The short answer

A 2 mm hook is not given a US letter size, UK 14, and 2/0号 in Japan. Buy by the millimetre number — it's printed on every hook and it means the same thing everywhere.

Shaft widths drawn at roughly life size. Hold your hook against the screen — the highlighted bar is 2 mm. Screen scaling varies by device, so treat this as a sanity check, not a measurement.

Amigurumi in fine cotton, thread work.

The same hook in every system

Millimetres (the one that always works)	2 mm
US	no US size
UK	14
Japanese 号	2/0号 unverified
Type	standard

Systems with no exact match

2 mm has no direct equivalent in 1 of the three systems. These are the closest hooks, with the size difference spelled out — substitute at your own gauge risk.

System	Closest hook	Actual size	Difference
US	5	1.75 mm	-0.25 mm

Yarn weights that suit this hook

1 standard yarn weight list 2 mm inside their recommended hook range. Expected single crochet gauge over 4 inches is shown as a range — the CYC figures assume a mid-range hook, so at 2 mm you will land toward the loose end. Swatch before you commit.

US weight	UK	Japan	sc / 4 in
Lace	1 ply	極細	32-42

2 mm hooks

Aluminium, ergonomic and Japanese-style options in this size.

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Nearby sizes

1.75 mm 2.25 mm 2.3 mm 1.5 mm 2.5 mm

All hook sizes · US to Japanese hook chart

Last updated 2026-08-30.