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Your math looks right with the Pi r squared part, now you would multiply that by 12" to get the area of the port. Then I would take that area and divide by the size of the new port to get the correct length. Seems like you are on the right track despite it being early... :)

edit: you must keep the area the same if you want the same tuning. The surface area of the port does not matter as much (it does matter though) as the total area of the port, L x W x H. Whether it is cylidrical or square the area should stay the same.

When in doubt use a port calculator. There are several websites with these on there.

me? naah i would never do that.....lol

lol, you post whore.

all right can someone double check my math here or see if im leaving something out?
a 3" port 12" long area is 3.14x1.5x1.5=7.065
now if i remember correctly i can now use a 7.065" x 1" slot instead of the 3" round as long as the depth of the port stays the same.....now if i wanted say a 2" opening on the slot port do i just figure the same surface area and go with it? damn its early....

duh....got it nevermind....

ok enclosure for round port is 1.1 cf....15 x 12 x 11 with a 3 x 12 round port.....what i would like to do is instead of using a round port use a slot port

ok its been a while so i need to know how to convert a 3 x 12 round port into a slot port.....its on the tip of my brain but its the part that they said would go first as i get older......ill do some math and get box dimensions up in a few