Pounds Per Cubic Feet (PCF) Classification

Less than 1 lb - Class 400
1 but less than 2 lb - Class 300
2 but less than 4 lb - Class 250
4 but less than 6 lb - Class 150
6 but less than 8 lb - Class 125
8 but less than 10 lb - Class 100
10 but less than 12 lb - Class 92.5
12 but less than 15 lb - Class 85
15 but less than 22.5 lb - Class 70
22.5 but less than 30 lb - Class 65
30 or greater - Class 60
 

Square Foot = 1,728
Height x Width x Length
12 x 12 x 12

Formula

Object: To find the pounds per cubic feet for a particular carton to determine the actual class:

Square Foot = 1728 inches
Measure the carton and multiply the H x W x L
Example: 40" x 24" x 40" = 38,400 inches
8 pounds per carton
Divide 38,400 by 1728 = 22.22
8 (weight of carton) divided into 22.22 = 2.78
PCF 2.78 = Class 250