US: 12-4E to United Kingdom Size 9-D

US: 12-4E: Corresponds to a foot length of 30.2 $\text{cm}$ (11.89 $\text{in}$), ball width of 12 $\text{cm}$ (4.72 $\text{in}$), acceptable ball width range between 11.7–12.4 $\text{cm}$ (4.61–4.88 $\text{in}$), and fit classification Extra-Wide (12-4E / EEEE).

United Kingdom Size 9-D: Corresponds to a foot length of 27.2 $\text{cm}$ (10.71 $\text{in}$), ball width of 10.4 $\text{cm}$ (4.09 $\text{in}$), acceptable ball width range between 10.1–10.7 $\text{cm}$ (3.98–4.21 $\text{in}$), and fit classification Standard Width (10-D / M).