What size is New Balance US 12 in Asics?

About Asics US 12 (EU 46), matched by ~28.9 cm. Then adjust for the specific model.

Is a New Balance 12 the same as a Asics 12?

Not always. Labels can map to different foot lengths — use cm, then model fit.

Brand-to-brand size at a fixed US label — matched by foot length (cm), not guesswork.

New Balance US 12 maps to about 28.9 cm on that brand’s chart. The nearest Asics row at that length is US 12 / EU 46.

Same chart cm can still feel different on foot. Read the guides:

New Balance: 550 (runs narrow) · 990v6 (runs big) · 9060 (true to size) · 574 (true to size) · 2002R (true to size)

Asics: Gel-Kayano 31 (true to size) · Gel-1130 (true to size)

What size is New Balance US 12 in Asics?: About Asics US 12 (EU 46), via ~28.9 cm.
Where is the full size table?: New Balance to Asics compare.