The volume formula for a cylinder is height x p x diameter 2 2 where diameter 2 is the radius of the base d 2 x r so another way to write it is height x p x radius 2. The formula for the volume of cylinder is. For square and rectangular tanks all you have to do is measure the length width and depth of the tank then multiply them together and divide by 231 the number of cubic inches in a gallon.
A roll of toilet paper because why not.
Liters cubic inches via the pull-down menu. Cylinder volume p r 2 l sphere volume 43 p r 3 tank volume cylinder volume sphere volume. A p r 2 where r is the radius which is equal to d2. Radius Diameter over 2.