



 
Bev, The weight of the gravel will depend on its density. I found this page which gives the density of various types of gravel in pounds per cubic foot. I am going to assume you have limestone just to illustrate how to make the calculations. Limestone has a density of 165 pounds per cubic foot and you have 5.22 cubic feet so that's 5.22 × 165 = 861.3 pounds. Now ask Google to convent to kilograms. Type 861.3 pounds in kilograms into the Google search window and Google responds with 861.3 pounds = 390.679108 kilograms. This is a large aquarium! Harley  


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