How much does 300X300 inch marble weigh?

The weight of a 300x300 inch marble slab depends on its thickness and the density of the marble. Generally, marble weighs about 170 pounds per cubic foot. Assuming a standard thickness of 1 inch, a 300x300 inch slab would weigh approximately 1,875 pounds (or about 850 kg). If the thickness varies, the weight would need to be adjusted accordingly.