Calculating the Weight of a Granite Countertop

Frederick M. Hueston  StoneForensics.com

To determine the weight of your granite countertop, you’ll need to know its dimensions (length, width, and thickness) in either inches or centimeters, as well as the specific gravity of the granite material. The specific gravity is a measure of the density of the granite compared to the density of water (which has a specific gravity of 1).

The formula to calculate the weight of your granite countertop is:

Weight (in pounds) = Length (in inches) x Width (in inches) x Thickness (in inches) x Specific Gravity of Granite x 0.0283

Alternatively, if you prefer to calculate the weight in kilograms, you can use the formula:

Weight (in kilograms) = Length (in centimeters) x Width (in centimeters) x Thickness (in centimeters) x Specific Gravity of Granite

Keep in mind that the specific gravity of granite can vary slightly depending on the type and composition of the granite. On average, granite has a specific gravity ranging from 2.63 to 2.75.

If you’re unsure about the specific gravity of your granite, you can use an average value, such as 2.7, for the calculation.

Please note that granite countertops can be quite heavy, and proper installation and support are essential to ensure their stability and safety. It is recommended to have a professional assess the weight and provide guidance for the installation process.