How do we determine the size of a shrimp? The size of a shrimp is defined as the number of pieces per pound, what means: pcs/lb Unless it is a whole shrimp, then as number of pieces per kg. Size: frozen – count – i.e. determined after freezing (taking into account the protective glaze) or real – count, less popular, determined before freezing. To calculate the number of pieces of shrimp per kg, we multiply the number of pieces per pound * 2.2. Because 1 pound = 450g For example, shrimps of size 300-500 pcs/lb are 660-1100 pcs/kg, and shrimps 31-40 pcs/lb are 68-88 pcs/kg. This means that a 400 g package (500 g with glaze) should contain 32 to 44 shrimps.