Calculus will work, if you have an equation describing the precise shape of the object.
If you don't (and probably even if you do), it's far easier to actually measure it (by submerging it in water and measuring the amount of water displaced) than it is to calculate it.
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conclusion
It is length * breadth * height.
Water Displacement Method?
The length times the width times the height.
method usede to figure the volume of an irregular shaped object