Assuming that both the floor and the upper rim are exactly the same size and the walls surrounding the tub are straight in a vertical direction, the tub is a cylinder. Here is the equation:
h * r^2 * pi
Where h is the height of the tub, r^2 is the radius (half of the tub's diameter) squared, and pi is, of course, approximately 3.14
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Volume of a cylinder = (pi) x (Radius)2 x (Length)
A round swimming pool is a right circular cylinder, so you can use the formula pi times the radius squared times the height to calculate the volume.
A good place to measure is the diameter of the circular end. That gives you the area of the circular end, and the only other number you need in order to calculate the cylinder's volume is its straight length.
If you multiply the three numbers, you get the volume - assuming the tub has a "block" (rectangular) shape.
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