United Kingdom Size 10-E to US: 9-3A

United Kingdom Size 10-E: Corresponds to a foot length of 28.4 $\text{cm}$ (11.18 $\text{in}$), ball width of 11.1 $\text{cm}$ (4.37 $\text{in}$), acceptable ball width range between 10.8–11.4 $\text{cm}$ (4.25–4.49 $\text{in}$), and fit classification Wide (11-2E / EE).

US: 9-3A: Corresponds to a foot length of 25.2 $\text{cm}$ (9.92 $\text{in}$), ball width of 9.3 $\text{cm}$ (3.66 $\text{in}$), acceptable ball width range between 9.1–9.5 $\text{cm}$ (3.58–3.74 $\text{in}$), and fit classification Extra Narrow (9-3A / AAAA).