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#### Robert97dodge

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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.

#### JasonB

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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.

(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

#### Robert97dodge

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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.

(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?

#### JasonB

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the 1728 is the conversion from cubic inches to cubic feet, its simply 12 x 12 x 12 (one 12 for ecah dimension used)

#### Tango

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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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