How to Calculate the Case Cube of a Box
To find the case cube of a box in cubic feet, first measure its length, width, and height in inches. Next, multiply all 3 figures together, then divide the result by 1728 to get your case cube measurement in cubic feet.
Measure the length, width and height of a single unit in either inches or meters. Whichever unit of measurement you use, measure all dimensions in the same unit of measurement. You could also measure the unit in centimeters, but converting centimeters cubed to meters cubed (the final measurement) can be very cumbersome. Instead, divide the centimeter measurements by 100 to convert them to meters before you move on. The word "unit" refers to whatever quantity the item is being sold/packaged in. So a single bottle, box or bag would be a unit. But if the item in question is being sold as a 3-pack of bottles, you'd have to measure all 3 bottles, as they're packaged together, to get the dimensions for calculating the case cube. Multiply the length, width and height of the unit together.  Divide the result by 1728 if your measurements were in inches. The resulting number is the case cube in feet cubed. If your measurements were in meters, no division is necessary; your result is the case cube in meters cubed. Finished.  
Measure the length, width and height of a single unit in either inches or meters. Multiply the length, width and height of the unit together. Divide the result by 1728 if your measurements were in inches. Finished. 