Calvin Klein Underwear Sizing
 
Calvin Klein Size Waist (inches) Waist (cm)
S 28-30 71-76
M 32-34 81-86
L 36-38 91-97
XL 40 102
 
Calvin Klein Big & Tall Size Waist (inches) Waist (cm)
Big Big Big
1X 42-44 107-112
2X 46-48 117-122
3X 50-52 127-132
4X 54-56 137-142
5X 58-60 147-152
Tall Tall Tall
LT 36-38 91-97
XLT 40-42 102-107
2XT 44-46 112-117
3XT 48-50 122-127
4XT 52-54 132-137
 
See our complete fitting guide here