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A US liquid gallon occupies 231 cubic inches. A cubic foot occupies 12" * 12" * 12" = 1728 cubic inches, so there are 1728/231 = 7.48 gallons in a cubic foot. The hot tub has a volume of 5 * 5 * 3 = 75 cubic feet. So it contains 75 * 7.48 = 561 gallons.
8*10*3 = 240 cubic feet.Each cubic foot = 28.317 liters (rounded)That's enough information to allow you to calculate the volume of the hot tub,in liters. We have no way to know now much water may or may not be in it.
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the formula is 7.5 gallons per cubic foot, so you actually need one more measurement. 30"=2.5 ft and 60"=5 ft, just say its 2 ft high. We would have 2.5x5x2=25 x 7.5=187.5
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