You just need to multiply the Area of the cylinder's circle, times the height of the cylinder.
Area = Pi * (radius * radius)
Volume = Area * Height
The only thing is all the units must be the same. For example, if you measure the radius in inches, the height must be measured in inches, then the result will be in cubic inches, which you can convert to gallons or whatever on the volume conversion page.
The radius is 1/2 the diameter.
As an example, I will calculate for a tank with a diameter of 100 inches and a height of 100 inches.
Area = 3.14 * (50 inches * 50 inches) = 7,850 square inches
Volume = 7,850 square inches * 100 inches = 785,000 cubic inches
You could then convert cubic inches to whatever you need on the volume conversion page.
1 cubic inches = 0.00432900431 gallons
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