red mangrove

can some 1 help me..... i need to figure out how many gallons of water i have in my refugium area i figured it out to be 48"x8"x11" of space the water ocupies.
 
plus i have an area thats 10.5 " x 20 " x 9.5 " how many gallons is that? is there a website or something or general rule of them so many square inches is a gallon?
 
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