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<blockquote data-quote="h17250x" data-source="post: 2798060" data-attributes="member: 575226">Here is another easy way to figure airspace.&nbsp;&nbsp; Go to Walmart and buy one of those yellow construction calculators(about 12 bucks).&nbsp; You can enter your measurements in Inches,feet,yards, whatever.&nbsp; Then you can convert it into cubic feet.&nbsp; If you are making measurements with outside dimensions subtract 20% of the volume that you come up with for your internal volume.&nbsp; i will give you and example using a regular calculator and with the construction calculator.Box size--&nbsp;&nbsp; 15 in ht.x 32 in wide x 18 in deep15 x 32 x 18=8640 cubic inches8640/1728=5 cu ft5 cubic feet minus 20%= 5 x .8=4cu ftinternal volume is 4 cu ft.To use that method all your dimensions need to be in inches but usually you have like 15 9/16 x 3 ft 3 3/8 inches x 18 1/8 inchesto enter that on the construction calculator and figure airspace do this15(inches button) 9(/)16&nbsp;&nbsp; x&nbsp; &nbsp; 3(inches) 3(/)8&nbsp; x&nbsp; 18(inches) 1 (/)8&nbsp; ( = )&nbsp; the readout says 951.9873 cu in.&nbsp; &nbsp; to convert that to cubic feet hit(conv button) then (feet) button and the answer is .550919 cu.ft.&nbsp; subtract your 20% by multiplying .550919 x .8 and you get the internal volume of the box( using 3/4 mdf).&nbsp; .440735 cu. ft&nbsp; &nbsp; &nbsp;&nbsp; I just fell in love with this calculator because i don&#039;t have to convert fractional measurements to decimals to make calculations.&nbsp; It comes with instructions but is really easy to get used to and like i said is only about $12.</blockquote>

[QUOTE="h17250x, post: 2798060, member: 575226"] Here is another easy way to figure airspace. Go to Walmart and buy one of those yellow construction calculators(about 12 bucks). You can enter your measurements in Inches,feet,yards, whatever. Then you can convert it into cubic feet. If you are making measurements with outside dimensions subtract 20% of the volume that you come up with for your internal volume. i will give you and example using a regular calculator and with the construction calculator. Box size-- 15 in ht.x 32 in wide x 18 in deep 15 x 32 x 18=8640 cubic inches 8640/1728=5 cu ft 5 cubic feet minus 20%= 5 x .8=4cu ft internal volume is 4 cu ft. To use that method all your dimensions need to be in inches but usually you have like 15 9/16 x 3 ft 3 3/8 inches x 18 1/8 inches to enter that on the construction calculator and figure airspace do this 15(inches button) 9(/)16 x 3(inches) 3(/)8 x 18(inches) 1 (/)8 ( = ) the readout says 951.9873 cu in. to convert that to cubic feet hit(conv button) then (feet) button and the answer is .550919 cu.ft. subtract your 20% by multiplying .550919 x .8 and you get the internal volume of the box( using 3/4 mdf). .440735 cu. ft I just fell in love with this calculator because i don't have to convert fractional measurements to decimals to make calculations. It comes with instructions but is really easy to get used to and like i said is only about $12. [/QUOTE]

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