Granite Countertop Weight Calculator
How much does a granite countertop weigh?
A 3cm granite countertop weighs 18-20 lbs per square foot. A 2cm slab weighs 12-13 lbs/ft².
Granite density: 172 lb/ft³ (2,750 kg/m³)
Calculate Your Granite Weight
Select a material and enter dimensions to calculate weight
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Calculating the weight of granite requires three measurements and one material constant. Measure the length, width, and thickness of your granite piece in consistent units, calculate the volume by multiplying all three dimensions together, then multiply the volume by granite's density to get the total weight.
The formula is straightforward: Weight = Length × Width × Thickness × Density. Granite's density typically ranges from 160 to 180 pounds per cubic foot, with 168 lb/ft³ (2,700 kg/m³) being the most commonly used average for standard granite varieties. Denser black granites like Absolute Black can reach 185 lb/ft³, while lighter varieties like Kashmir White may come in around 158 lb/ft³.
When working in imperial units, make sure all dimensions are in feet before multiplying. If you measured thickness in inches, divide by 12 to convert to feet. For example, a 1.25-inch thick slab would be 0.104 feet thick.
Calculations verified using ASTM C615 standard density values
Last updated: February 2026