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It would be about 30 gallons.

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128 ounces = 1 gallon (US)

1 cu. ft water = 62.4 pounds

Described tank = 4.37 cu. ft

4.37 cu, ft = 273 lb

273 lb = 34.125 gallons

=====================

231 cubic inches = 1 US gallon

Volume = 20" x 18" x 21" = 7,560 cubic inches = 32.727 gallons (rounded)

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11y ago
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10y ago

27.429 gallons for each inch deep.

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Q: How many gallons in a 20 x 18 x 21 fish tank?
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