7 mm crochet hook

The short answer

A 7 mm hook is not given a US letter size, UK 2, and 7mm 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 7 mm. Screen scaling varies by device, so treat this as a sanity check, not a measurement.

Chunky yarn, quick projects.

The same hook in every system

Millimetres (the one that always works)	7 mm
US	no US size
UK	2
Japanese 号	7mm unverified
Type	jumbo

Systems with no exact match

7 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	K/10.5	6.5 mm	-0.5 mm

Yarn weights that suit this hook

1 standard yarn weight list 7 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 7 mm you will land toward the tight end. Swatch before you commit.

US weight	UK	Japan	sc / 4 in
Bulky	Chunky	極太	8-11

7 mm hooks

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

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Nearby sizes

6.5 mm 6 mm 8 mm 5.5 mm 5 mm

All hook sizes · US to Japanese hook chart

Last updated 2026-08-30.