www.edesignaudio.com

Go to the Design Your Own Enclosure part. Enter your dimensions. It will tell you the ft.^3 at the top.

 

ok so i relized i wired them wrong so i just checked everything and then turned the sound on,,,,did not sound bad but its deffently not air tight. being my first box jsut used liquid nails around the edges of the inside and some of the outside of the box after i screwed it together didnt think i needed to before screwing in between boards so im going to get more liquid nails and just do the edges everywhere and see where this brings me and my parents own a sewing shop so tomarrow im going to see what my mom can do for me about a scion logo or something on the box too.

 

In order to determine the internal volume of an enclosure, measure it's inside dimensions, multiply them together, and then divide by 1728. Let's say it's a square box made from 3/4" MDF, which is 13.5"x13.5"x13.5" on the outside. Measuring the inside, we'd find it's 12"x12"x12", and that's 1728", which happens to be exactly one cubic foot. As another example, if you made a rectangular box that was 7"deep by 13" high by 34" wide on the inside, that would be 3094 cubic inches, which when divided by 1728 (1 cubic foot), is 1.79 cubic feet.

When starting out it's a good idea to build sealed boxes rather than ported, because they're easier to construct, they can often much be smaller, and they're more forgiving when the enclosure size isn't optimal.