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The tank has a maximum holding capacity of 25.45 gallons US. Filled to within 2" of the top it will hold 22.9 gallons US. For your future reference the calculation is " length in inches x width in inches x height in inches divided by 231.
A 20 Gallon tank can hold up to 20 gallons of water.
The tank has a volume of 48 inches x 18 inches x 15 inches or 12960 in3. The average imperial gallon has a volume of 231 cubic inches. 12960 in3 ÷ 231 in3/US gallon = 56.10 gallons.
92928 cubic inches
A 15 cubic foot tank will hold a maximum of about 112.2 gallons of water.