Measure the inside diameter of the tank, I'm assuming it's a cylinder. Volume of a cylinder is Base x Height.
Base of a cylinder is PI x Radius squared.
Radius = 1/2 diameter
So, (1/2 diameter)(1/2 diameter)(3.14) = Base
Base x Measured height is volume in cubic inches. Convert cubic inches to gallons.
If it's not a cylinder, same equation works. Base x Height. Or, length x width x height.
Also, a gallon of water weighs 8.34 pounds. Fats are less dense than water, so that 7.6 sounds like it could be right.
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