Volume of a pyramid type box

[ikpthegame 10+ year member]

So I'm gonna be doing a read seat delete in my mustang. I'm gonna be making the back panel with a fiberglass box built into it. What I need to know is how would I figure out the internal volume of the box? It's gonna be pyramid shaped but longer on the sides than the top and bottom.

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[lew-e 10+ year member]

Fiberglass it, pull it out, and fill it with packing peanuts. Then measure those. Or do a whole lot of measuring

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[Booming]

This will give you a rough idea of your volume. But the best way is like @lew\-e suggested build it and then measure the actual volume with packing peanuts or something like that.

Square Pyramid Calculator