How Much Does a Quartz Countertop Weigh per Square Foot?

Choosing new countertops for your kitchen or bathroom remodel? Quartz countertops are a popular option due to their durability, aesthetics, and ease of maintenance. But before installing quartz, it’s important to understand how much weight it can add to your counters. Here’s a detailed overview of quartz countertop weight per square foot.

What is Quartz?

Quartz countertops, sometimes called engineered stone, are made from ground natural quartz crystals combined with resins and pigments. The quartz content typically ranges from 90-94%, with polymer resins making up the remainder.

Compared to natural stone like granite and marble, quartz offers superior durability and stain resistance. And unlike laminate, quartz countertops are nonporous and won’t harbor bacteria. With a wide variety of colors and patterns, quartz provides the look of natural stone with added practicality.

Average Weight of Quartz Countertops

The weight of quartz countertops can vary slightly by manufacturer and thickness. But on average, quartz weighs about 15 pounds per square foot.

Here are some typical quartz countertop weights:

  • 3/4″ thick quartz: Approximately 15 lbs/sq ft
  • 1 1/4″ thick quartz: Approximately 18 lbs/sq ft
  • 2″ thick quartz: Approximately 21 lbs/sq ft

To put this in perspective, 12mm (1/2″) thick porcelain and ceramic tile weighs around 9-11 lbs/sq ft. Granite countertops are a bit heavier, averaging 18-22 lbs/sq ft for 3/4″ thickness.

So quartz falls right around the middle of the weight range for popular countertop materials. The added weight is due to the high percentage of natural stone in the quartz blend.

Why Quartz Thickness Matters

The thickness of your quartz slab will directly impact how much it weighs per square foot. Most quartz countertops are either 3/4″ (2cm) or 1 1/4″ (3cm) thick.

3/4″ quartz countertops are strong enough for most residential uses. But some homeowners prefer the sturdier feel and appearance of thicker 1 1/4″ quartz.

Here’s an overview of how quartz thickness affects weight:

  • 3/4″ quartz weighs about 15 lbs/sq ft – This is the standard thickness and provides ample strength for kitchen countertops and backsplashes. It’s lightweight compared to natural stone.
  • 1 1/4″ quartz weighs around 18 lbs/sq ft – The extra thickness gives the counters a more substantial feel and can support heavier impact loads. It may be recommended for floors or commercial use.
  • 2″ thick quartz weighs approximately 21 lbs/sq ft – Used for some flooring applications where maximum durability is needed. Significantly heavier than 3/4″ thickness.

Always consult your quartz manufacturer’s recommendations when choosing a thickness. And remember that thicker quartz will translate into higher material costs.

Weight Considerations for Your Project

When planning for quartz counters, it’s a good idea to think about how the weight could impact your project:

Cabinet support – Most standard kitchen cabinets can easily support 3/4” quartz. But heavier 2cm+ slabs may require reinforced cabinets.

Load on flooring – With quartz flooring, the weight load adds up quickly. Make sure your foundation can handle the load without sagging or cracking.

Transport and handling – Thick quartz requires more manpower or lifting equipment to maneuver into place. You may need to coordinate crane access.

Seams – Using fewer pieces means fewer seams. Optimal support is easier with lighter countertop weights.

Overhangs – A heavy quartz overhang could put too much stress on the base cabinets and compromise durability.

Sink support – A heavy undermount sink and thick quartz may warrant added structural support like corbels or extra brackets.

Advantages of Quartz Weight

While heavier than materials like laminate, the weight of natural quartz countertops also provides some benefits:

  • Sturdy feel – The heft of quartz gives counters a solid, quality feel underhand. The material’s density also minimizes motion when you place heavy objects on the surface.
  • Noise reduction – A bit of weight is good for reducing noise. Heavier quartz counter and flooring materials can help dampen echoes and ambient noise in kitchens.
  • Durability – The added thickness and density make quartz more resistant to impact damage, cracks, and stress over time.
  • Stability – Proper support allows thick quartz slabs to remain flat and avoid warping or buckling issues.

Is the Weight of Quartz a Problem?

For most residential settings, the typical weight of quartz countertops is not problematic. With proper cabinet reinforcement and support, standard 3/4” to 1 1/4” quartz can be used safely in kitchens and bathrooms.

The weight only becomes an issue if the underlying structures are not designed to handle the load. It’s extremely important to consult a structural engineer if you have floor sagging or cracking issues. They can assess whether your foundation needs extra support to accommodate heavier countertop weights.

With appropriate precautions and professional installation, you can enjoy the beauty and practicality of quartz without worrying about its density and weight per square foot. Just account for thickness, overhangs, and structural support during your remodeling project planning.

FAQ About Quartz Countertop Weight

How much does 3cm quartz weigh?

Three centimeters equates to 1 1/4 inches—the thicker quartz material weighs approximately 18 lbs per square foot.

Is thicker quartz better?

In terms of durability, yes, thicker quartz holds up better over time, especially for high-traffic areas. But thickness does affect the weight and cost.

How thick should quartz countertops be?

The standard 3/4″ thickness is suitable for most kitchen countertops. Go with 1 1/4” or thicker for higher durability needs, like flooring or commercial projects.

Can you put heavy objects on quartz?

Yes, quartz can support very heavy loads. But sudden impacts may cause chips or cracks. Use trivets for hot items and avoid dropping heavy objects.

Does quartz add a lot of weight to cabinets?

Not with proper cabinet construction. Standard kitchen cabinets can support the 15 lbs/sq ft weight of 3/4” quartz counters without issues.

Can old cabinets support quartz?

Maybe, if the existing cabinets are structurally sound. Adding support brackets or corbels can help reinforce older cabinets for heavy quartz countertops.


When selected for kitchen counters or flooring, quartz offers unparalleled durability, style, and stain resistance compared to many other materials. And with an average weight of around 15 pounds per square foot, quartz won’t overload standard cabinets or floor framing in residential settings. Just be sure to account for thickness, overhang length, and structural support when planning and installing your new quartz surfaces. With good design and professional installation, you can enjoy worry-free performance for many years.