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Air space formula

3654 Views 4 Replies 3 Participants Last post by  Tango
Does anyone know the formula for figuring up the air space in a box? Say for instance a box is 16.5" tall X12.5" long X16.5" wide using 3/4" plywood what would the air space be of that box? I need to know the formula not just the air space. THanks.
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for a rectangular box, its simply Lenght x Height x Width. If the dimensions you provided are exterior dimensions, then subtract 2x the material thickness from each dimension prior to multiplying.

So for your stuff its:

(16.5 - (2 * 0.75)) x (12.5 - (2 * 0.75)) x (16.5 - (2 * 0.75)) = cubic inches

Then you can take cubic inches and divide by 1728 to get cubic feet
On 2005-12-05 17:15, The Boss wrote:
for a rectangular box, its simply Lenght x Height x Width. If the dimensions you provided are exterior dimensions, then subtract 2x the material thickness from each dimension prior to multiplying.

So for your stuff its:

(16.5 - (2 * 0.75)) x (12.5 - (2 * 0.75)) x (16.5 - (2 * 0.75)) = cubic inches

Then you can take cubic inches and divide by 1728 to get cubic feet

I did the length Xwidth X hieght and came out to 2475. Which is my cubic inches right? So then I just take that and divide by 1728 and that gets me my cubic feeet which is 1.4. Where does the 1728 come from?
the 1728 is the conversion from cubic inches to cubic feet, its simply 12 x 12 x 12 (one 12 for ecah dimension used)
you might also factor in that 3/4" plywood is really 23/32" ... just like a 2x4 is not 2"x4"
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