How do I calculate the board foot of different shapes other than squares and rectangles? To be more specific, I want to learn to calculate for trapezoids, triangles, cylinders. I dont know much about woodwork so please go easy on term, etc. Thanks!
Board foot is 12x12x1 inches, so 144 cubic inches, so calculate volume in cubic inches (see your geometery teacher/look up online) and divide by 144.
If you want to know "how many board feet I need to buy to make (whatever odd shape of whatever volume)" you'll need to go back to rectangular prisms since lumber is sold in rectangular pieces. And even making rectangular pieces, some waste is expected getting from the rough lumber to the finished product.