US: 3.5 to Europe Size 18

Cross-market children’s footwear conversion mapping 3.5 specifications into 18 for sneakers, boots, sandals, dress shoes, slippers, and dance shoes.

From Standard & Size

Converted Equivalent

19.5

Based on row equivalence: US 3.5 | EU 19.5 | Foot Length 11.5 cm

Standard cross-walk matching active anthropometric row parameters.

Analyzing Footwear Size Equivalence Across Markets

US: 3.5: Corresponds to a foot length of11.5 $\text{cm}$ (4.5 $\text{in}$ ), estimated age 12-18m, and Mondopoint 115 $\text{mm}$ .

Europe Size 18: Corresponds to a foot length of 10.0 $\text{cm}$ (3.9 $\text{in}$ ), estimated age 6-9m, and Mondopoint 100 $\text{mm}$ .