whats the formula for finding the cubic feet of a box??

whats the formula for finding the cubic feet of a box??
PhAzE OnEr
1999 dodge stratus
200 amp alt from iraggi alt.
pioneer premier deh-p860mp
front doors/pioneer 6 1/2"
rear fill/pioneer 6x9"
mids and highs amp/power acoustik LT960.4
subs amp/ 1 a3000db wired to 1 ohm sold one amp
subs/1 12" RE XXX ported
have 2 one is blown
i need to start over with some new equipment
thinking maybe orion or mmats?????
:up2someth :blow_up:

LxWxH/1728- outside measurementsOriginally posted by phazeone
whats the formula for finding the cubic feet of a box??
For inside, its (L-2T)x(W-2T)x(H-2T)/1728
T= thickness of wood.
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