convert inches to gallons in a 400 gallon tank
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If that is in inches, multiply it out, the result will be in cubic inches. To convert that to gallons, you then divide by 231, since a gallon is defined as 231 cubic inches.
1 gallon = 231 cubic inches Volume of the tank is (10 x 20 x 12) = 2,400 cubic inches The tank has a capacity of (2,400 / 231) = 10.39 gallons (rounded), but we have no way of knowing how many gallons are "in it".
Gallons in a rectangular tank =(tank's length in inches) times (tank's width in inches) times (water depth in inches) divided by (231)
222
5,775 cubic inches in 25 US gallons.