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For the size in gallons for a rectangular aquarium, the formula is: (Length x Width x Height) divided by 231
So, 30 x 12 x 12 = 4320/231 = 18.7
I'd call it a 20 gallon tank, rounding up.
Wiki User
∙ 15y ago
Wiki User
∙ 8y ago30 x 12 x 15 inches equals 5,400 cubic inches. This equates to 23.38 gallons.
Wiki User
∙ 11y agoIf you mean inches, the tank will hold up to 29.6 gallons.
Wiki User
∙ 10y agoIf you mean 12x12x12 feet, the total volume would be 12,926.34 US gallons of water.
Wiki User
∙ 9y agoThat is approximately 32,313.6 US gallons.
Wiki User
∙ 9y agoWe need depth to calculate that
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