US: 12-XW to Europe Size 31

Cross-market children’s footwear width fitting conversion mapping 12-XW specifications into 31 for Brannock infant/child grades, M/W/XW sizing indexes, and ball width dimensions.

From Standard & Size

Converted Equivalent

Based on row equivalence: US 12-XW | EU 30 | Foot Length 18.5 cm

Standard cross-walk matching active anthropometric row parameters.

US: 12-XW to Europe Size 31 Width Conversion

Analyzing Shoe Width and Fitting Equivalence Across Markets

US: 12-XW: Corresponds to a foot length of 18.5 $\text{cm}$ (7.3 $\text{in}$ ), ball width of 8 $\text{cm}$ (3.15 $\text{in}$ ), grade Extra-Wide (4E), growth margin 1 $\text{cm}$ , estimated age 7-8y, Mondopoint 185 $\text{mm}$ , and fit type Little Kid Extra-Wide (US 12 / Width 4E).

Europe Size 31: Corresponds to a foot length of 19 $\text{cm}$ (7.5 $\text{in}$ ), ball width of 7.3 $\text{cm}$ (2.85 $\text{in}$ ), grade Medium / Standard (D), growth margin 1 $\text{cm}$ , estimated age 8-9y, Mondopoint 190 $\text{mm}$ , and fit type Little Kid Medium (US 13 / Width D).