Sub enclosure help

[Oldskool 10+ year member]

I received a bunch of different answers at the SD board so I thought I'd try my question here....

I'm trying to figure out how much space the following box will provide for each sub (ignore the ports as the box is going to be sealed). The box will be constructed of 3/4 MDF. I'd also like to know how to figure it out for myself for future reference. TIA

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[Oldskool 10+ year member]

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[bcarpenterfhl 10+ year member]

with the divider, ~2.14 ft. per sub. dont take my word for it, i did a super quick calculation.