US: 50 to United Kingdom Size 30

US: 50: Corresponds to a waist size of 125 $\text{cm}$ (50 $\text{in}$), total strap length of 140 $\text{cm}$ (55.1 $\text{in}$), and recommended fit classification Extended / Plus.

United Kingdom Size 30: Corresponds to a waist size of 75 $\text{cm}$ (30 $\text{in}$), total strap length of 90 $\text{cm}$ (35.4 $\text{in}$), and recommended fit classification Standard / Regular.