Europe Size 31 to US: 9-XW

Cross-market children’s footwear width fitting conversion mapping 31 specifications into 9-XW for Brannock infant/child grades, M/W/XW sizing indexes, and ball width dimensions.

From Standard & Size

Converted Equivalent

13-M

Based on row equivalence: US 13-M | EU 31 | Foot Length 19 cm

Standard cross-walk matching active anthropometric row parameters.

Europe Size 31 to US: 9-XW Width Conversion

Analyzing Shoe Width and Fitting Equivalence Across Markets

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).

US: 9-XW: Corresponds to a foot length of 15.5 $\text{cm}$ (6.1 $\text{in}$ ), ball width of 7.1 $\text{cm}$ (2.8 $\text{in}$ ), grade Extra-Wide (4E), growth margin 0.9 $\text{cm}$ , estimated age 4-5y, Mondopoint 155 $\text{mm}$ , and fit type Toddler Extra-Wide (US 9 / Width 4E).