There are about 7.48 US gallons in a 12 x 12 x 12 (or 1728) cubic inch container. (That's a cubic foot, but you probably knew that.) There are about 12,926.3 US gallons in a 12 x 12 x 12 cubic foot container. Other units of measure of your 12 x 12 x 12 container will yield different results.
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Approx 2.1 Imperial gallons = 2.5 US gallons.
1 gallons = 4 quarts ⇒ 12 quarts = 12 ÷ 4 gallons = 3 gallons
24" x 24" x 36" = 89.8 US gallons.
12 gallons exactly.
12 quarts = 12/4 gallons = 3 gallons