1.5 mm crochet hook

The short answer

A 1.5 mm hook is a US size 6, and レース針2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 1.5 mm. Screen scaling varies by device, so treat this as a sanity check, not a measurement.

Size 10 cotton, edgings.

The same hook in every system

Millimetres (the one that always works)	1.5 mm
US	6
UK	no UK size
Japanese 号	レース針2号 unverified
Type	lace

Systems with no exact match

1.5 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
UK	14	2 mm	+0.5 mm

Yarn weights that suit this hook

1 standard yarn weight list 1.5 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 1.5 mm you will land toward the tight end. Swatch before you commit.

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

1.5 mm hooks

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

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Nearby sizes

1.25 mm 1.75 mm 1 mm 2 mm 0.9 mm

All hook sizes · US to Japanese hook chart

Last updated 2026-08-30.