how to calculate volume for slanted box?

I am making a basic box for an old set of 10w6's that I had lying around for my '85 Ranger. Anyway, how do I calculate the internal volume of a box with a slanted front? The box with be 9.5" deep at the base and 6.5" deep at the top. I forget the formula to figure this out w/ this involved. Also, how exactly would I cut the edges of the MDF, so when put together, the edges are nice and smooth. See the circled areas in the illustration below. Thanks

does no one pay attention to the sticky posts at the topof the forum?! fill it with packing peanuts then measure the volume of them. that will be close. someone said sand works too and is more precise, i tend to agree but only if precise = heavy! good luck.

i know the packing peanuts trick. that's a dumb idea in my case. what am i going to spend hours making this box, and then hope the internal volume is what I need it to be. that's the entire point in designing the box, and figuring out what it's ideal dimensions should be to get the best internal volume

Well then if you haven't even built the box, then you can already determine what you need the cubic measurement to be. So what exactly are you talking about? You don't know how to calculate the cubic feet for your box?

i was trying to figure out how I can calculate the volume of a box (before building it), so i can determine what the dimensions of the box should be. a regular box is easy to calculate, but i was sure about a box with a top depth of 6.5" and bottom depth of 9.5", but I have since found a calculator for this

oops ,sorry, came off as a dick, and I didn't realize that you had found the calculator. The packing peanuts is only really useful for odd shaped boxes that can't easily be measured. If the box has straight sides, it's a lot easier to just measure and calculate than to fill it up with packing peanuts.

also- you can divide the enclosure into a square and a triangle-prism and find the volume of each seperate and add them. i didnt realize u hadnt built the box yet. ~Ryan (i mean divide them in your head, not literally sawing the box into 2 pieces.)

rt2party wrote: also- you can divide the enclosure into a square and a triangle-prism and find the volume of each seperate and add them. i didnt realize u hadnt built the box yet. ~Ryan (i mean divide them in your head, not literally sawing the box into 2 pieces.)

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