Enter the bag length, the bag width, and the bag depth/height (i.e., the expanded gusset or filled thickness) into the Flat Bag Volume Calculator. You may also enter the volume and leave one dimension blank. The calculator will evaluate and display the estimated bag volume.

Flat Bag Volume Calculator

Enter the bag’s dimensions to get its volume.

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Flat Bag Volume Formula

The following formula is used to estimate Flat Bag Volume by modeling the filled bag as an ideal rectangular prism (box). Use the bag’s interior length, width, and the expanded depth (gusset) or filled thickness. (If a bag is truly “flat” with essentially no gusset/depth, its volume is approximately zero and an area-based calculation may be more appropriate.)

FBV = BL * BW * BH
  • Where FBV is the estimated bag volume (in^3 when BL, BW, and BH are in inches)
  • BL is the bag length (in) 
  • BW is the bag width (in) 
  • BH is the bag depth/height (in) (expanded gusset or filled thickness) 

To calculate the estimated bag volume, multiply the length, width, and depth/height together using consistent units (the result will be in the corresponding cubic units).

How to Calculate Flat Bag Volume?

The following example problems outline how to calculate Flat Bag Volume.

Example Problem #1

  1. First, determine the bag length (in).
    1. The bag length (in) is given as 10.
  2. Next, determine the bag width (in).
    1. The bag width (in) is given as 10.
  3. Next, determine the bag height (in).
    1. The bag height (in) is found to be: 10.
  4. Finally, calculate the Flat Bag Volume using the formula above: 

FBV = BL * BW * BH

Inserting the values from above yields: 

FBV = 10 * 10 * 10 = 1000 (in^3)

Example Problem #2

The variables needed for this problem are provided below:

bag length (in) = 5

bag width (in) = 5

bag height (in) = 5

Entering these values and solving gives:

FBV = BL * BW * BH = 125 (in^3)