Calculating Theoretical Box Compression

Steve asks:

How can you calculate a theoretical box compression value if you know the ECT value of the combined board, you have the dimensions of the box and can figure out the Square root of the perimeter? What is the formula we should use?

You have everything listed above except one important factor, the caliper. You need the caliper and then you’re all set. So the formula you would want to use is 5.87 x ECT x (the square root of (caliper x box perimeter)).

(Steve has provided caliper and other the carton specs as)

• multiplier = 5.87
• ECT value = 154.7
• Perimeter = 148”
• Caliper = .4375” (AA DW)

So our equation would look like this,

Predicted BCT = 5.87 x 154.7 x (√ (.4375 x 148)) = 7307.11 lbs.

Or… 5.87 x 154.7 x 8.0467 = 7307.11 lbs

Just a note, rounding can have a significant effect on the result. It may be better to round down than to round up for the sake of safety.

— Ralph

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