- HOW TO MEASURE CORRUGATED BOXES -
First carefully remove the tape, or stitches, or separate the glue flap. Lay the container flat with the inside liner facing up. The unjoined container should now appear as illustrated at the right. >>>>>

The container panel measurement should be taken on panels 2 and 3. Take your pen and mark the exact center of the scores enclosing the panel involved and measure the distance between the marks to the nearest sixteenth inch. THIS MEASUREMENT IS NOT THE INSIDE DIMENSION FOR THE CASE.  Deduct from this the "Score Allowances" as follows:

                RSC SCORE ALLOWANCES
                 Dimension               Subtract
                  Length                         3/16
                  Width                          3/16
                  Depth                           3/8     
At right is an illustrated example of an RSC container 12 x 6 x 8 measured by the center of score to center of score method.  
To properly measure a corrugated box, score to score measurements should be taken for each dimensions. Since when describing a corrugated box the inside dimensions (or usuable carton capacity) is considered, predetermined deductions from score to score measurements must be made to arrive a the true box size. Board flute, being of variable thickness, requires that each flute have their own set of score to score measurement deductions as follows:

ALLOWANCES FOR RSC BOXES
FLUTE
B
C
A		 L
1/8"
3/16"
1/4"		 W
1/8"
3/16"
1/4"

D
1/4"
3/8"
1/3"

NOTE: Always measure panels not adjacent to the tape of glue
joint. Measure from the center of score to center of score.