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That would be hard to say considering that different rocks have different density.

As a rough measurement one can assume that the weight of rock is approximately 3 times that of water per cubic meter i.e. 3000kg per cubic meter. Another source assumed that rock is 2.7 times the weight of water. It would seem that this is a good approximation, but in the end density and volume will give you the most accurate answer.

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Q: How to estimate weight of a rock or boulder based on its size cubic inches or feet or whatever?
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