Estimate box crush test strength from ECT, box dimensions, and board thickness, then find safe stacking load and maximum stack height.

Box Crush Test (BCT) Calculator

BCT from ECT
Stacking Load

Estimate box compression strength from ECT and box size using the simplified McKee formula.

Results are estimates based on the simplified McKee formula and basic stacking factors and are not a substitute for laboratory box compression testing.

Box Crush Test (BCT) Formula

The following formula is used to calculate the Box Crush Test (BCT). 

BCT = 5.876*ECT*SQRT(P*T)

Variables:

  • BCT is the Box Crush Test (BCT) ( )
  • ECT is the edge crush test (ECT) 
  • P is the box perimeter (in) 
  • T is the box thickness (in) 

How to Calculate Box Crush Test (BCT)?

The following steps outline how to calculate the Box Crush Test (BCT).

  1. First, determine the edge crush test (ECT).
  2. Next, determine the box perimeter (in). 
  3. Next, determine the box thickness (in). 
  4. Next, gather the formula from above = BCT = 5.876*ECT*SQRT(P*T).
  5. Finally, calculate the Box Crush Test (BCT).
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

edge crush test (ECT) = 145

box perimeter (in) = 40

box thickness (in) = 3

BCT = 5.876*ECT*SQRT(P*T) =  ?