Can someone help me figure out some cubic feet.

Johnny Law.Lulz
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Truck box 1

- 49 1/4" long

- 14 5/8" tall- 8 1/2" deep at bottom

- 5 1/8" deep at top

Material is 5/8 " Thick

Truck boxes 2 and 3

- 15 11/16" tall

- 13 5/16" long

- 3 7/8" deep at top

- 6 1/16" deep at bottom

Material is 1/2" thick

Boxes 4 and 5

- 13 3/4" tall

- 13 3/4" Deep

- 13 3/4" wide

Material is 3/4" thick

All of these are FS btw - Truck box 1 is for dual 12's, Truck boxes 2 and 3 are for 8"s and boxes 4 and 5 are for a 12" a piece

 
how do i figure cubic feet
i did L x W x H divided by 12 and im getting some crazy number. i was just using 12" to see if it came out right on my calculator - am i missing something.
For a rectangular cross section you are on the right track. HOWEVER instead of dividing by 12 you want to divide by 1728 (12"x12"x12"=1728in^3) When you multiply your dimensions you get a number and you are also multiplying your units which will need to be taken care of. There is 1728in^3 per ever 1ft^3. For the truck boxes you will have to break the cross section down into a rectangle (top depth x height x width) and then add the area of the triangle front piece ((bottom depth - top depth) x height x width) then add the 2 in^3 numbers you get and divide the sum by 1728in^3 per 1ft^3 to get an over all volume in cubic feet.

 
I'm so glad someone asked this question.
The metric system is so much easier.
I dunno, honestly I prefer the english system but thats just me. I can work with either one though, but I guess that comes when multiple college courses dealt SPECIFICALLY with units and units alone lol.

also anyone needing any sort of online unit conversion the best place I have ever found is http://www.onlineconversion.com

Now can anyone tell me how tall in feet I need my 16m diameter water tank to be so that it can hold 3 acre feet of rain water?

 
Now truck boxes 2 and 3, .42 cu ft gross. I want to tune them to 33 Hz with an aeroport and obviously i dont have a lot of room on them. What size and length would i need. I just want one port in each one.

 
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Johnny Law.Lulz

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