Granite is one of the most widely used natural stones in construction and interior design, especially for countertops, flooring, and wall cladding. When choosing granite, understanding its weight is just as critical as understanding its aesthetics. Knowing how much granite weighs is essential for proper transportation, structural planning, and installation.
In this comprehensive guide, we break down the weight of granite by thickness, application, and project scale. Whether you’re selecting granite countertops, tiles, or slabs, this article will help you make informed decisions.
What Is Granite?
Granite is a coarse-grained, igneous rock composed primarily of quartz, feldspar, and mica. Its high durability, aesthetic versatility, and availability in a variety of colors make it a favorite in both residential and commercial spaces.
Learn more: What is the texture of granite?
Granite Weight Basics
Granite Weight Per Cubic Foot
Granite typically weighs 165 to 175 pounds per cubic foot (2,640–2,800 kg/m³). The weight varies based on its density and mineral composition.
Learn more: What is the density of granite?
Weight by Thickness
| Thickness | Weight per Square Foot |
|---|---|
| 2 cm (~3/4″) | 13 – 15 lbs |
| 3 cm (~1 1/4″) | 18 – 20 lbs |
This makes a standard 3 cm granite countertop about 20 lbs per square foot.
How Much Does a Granite Countertop Weigh?
Average Countertop Size
A typical kitchen countertop is around 25 inches deep and can range in length from 6 to 10 feet or more.
Example Calculation:
- 3 cm thick granite
- 25 in. x 120 in. (10 ft.)
- Square footage: 20.8 sq. ft.
- Weight: 20.8 x 20 lbs = 416 lbs
Island Countertops
- 3 cm thick granite on a 4 ft. x 8 ft. island = 32 sq. ft.
- Weight: 32 x 20 lbs = 640 lbs
Applications and Impacts of Granite Weight
Transportation
- Requires forklifts or lifting equipment
- Crating and careful handling are essential
Installation
- Heavier slabs need extra manpower
- Must ensure cabinet structures can bear the load
Granite Countertop Installation
Design and Support Planning
- Weight impacts the type of bracing or substrate used
- Some islands may need additional reinforcement
Common Granite Weights by Application
Countertops
- Kitchen (10 ft.): ~400–500 lbs
- Bathroom vanity (4 ft.): ~100–150 lbs
Tiles
- 12″ x 12″ tile (3/8” thick): ~5.5 lbs
Slabs
- Full-size slab (120″ x 70″ x 3 cm): ~700–800 lbs
Comparing Granite to Other Stone Weights
| Material | Approx. Weight (lbs/cu ft) |
| Granite | 165 – 175 |
| Marble | 160 – 170 |
| Quartz | 155 – 165 |
| Soapstone | 160 – 180 |
| Concrete | 140 – 150 |
Design Considerations for Heavy Granite
Color and Edge Pairings
Aesthetic Integration
Matching Functional Support
- Ensure brackets, legs, or steel reinforcements are rated for expected load
Aardwolf Granite Solutions
Aardwolf provides complete granite solutions that combine both beauty and engineering integrity:
- Premium slabs of varying thicknesses
- Expert countertop installation and lifting equipment
- Affordable, strong, and stylish countertop options for kitchens and bathrooms
Explore the full Aardwolf Granite Countertop Collection
Final Thoughts: Weight Is Strength in Stone
So, how much does granite weigh? On average, granite weighs 20 pounds per square foot for a 3 cm slab. Whether you’re a homeowner upgrading a kitchen or a contractor outfitting a commercial space, granite’s weight is a key factor in transportation, support, and installation.