US: 7-3A to United Kingdom Size 8-AA

US: 7-3A: Corresponds to a foot length of 23.8 $\text{cm}$ (9.35 $\text{in}$), ball width of 9 $\text{cm}$ (3.5 $\text{in}$), acceptable ball width range between 8.8–9.2 $\text{cm}$ (3.45–3.6 $\text{in}$), and fit classification Extra Narrow (7-3A / AAAA).

United Kingdom Size 8-AA: 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).