What US size is 30 cm?

Often around US 13 in Nike, but brands differ — use the table and model guides.

How should I measure?

Stand, heel against a wall, mark longest toe; measure in cm. Then open the cm converter and the model fit page.

Foot length in centimetres mapped to brand US/EU labels from reference charts — not a Mondopoint guarantee.

Nearest chart row within 0.35 cm — labels can still disagree across brands.

Brand	US	EU	Chart cm
Nike	13	47	29.7
Adidas	13	47.5	29.7
New Balance	13	47.5	29.8
Doc Martens	13	48	29.9
Brooks	13	47.5	29.7
Converse	13	47.5	29.9
Crocs	13	47.5	30.1
Jordan	13	47.5	29.7
Reebok	13	47.5	29.7
Vans	13	47.5	29.8

cm → label is a start. Lasts still run long/short/narrow:

Nike: Air Force 1 '07 (runs big) · Dunk Low (true to size)

Adidas: Samba OG (runs narrow) · Gazelle (runs big)

New Balance: 550 (runs narrow) · 990v6 (runs big)

Doc Martens: 1460 8-Eye Boot (runs big) · 1461 3-Eye Shoe (runs big)

What US size is 30 cm?: Often near Nike US 13; compare brands in the table, then read model guides.
Is chart cm the same as lab internal length?: No. Chart cm is recommended foot length / Mondopoint-style. Lab internal length (when we have it) is a different measurement on model pages.