How Much Does Granite Weigh? Countertop Weight Guide

I Almost Dropped a Granite Slab on My Foot

So there I was, helping a buddy move a leftover piece of granite from his kitchen reno into his garage, and I honest-to-god underestimated how heavy that thing was. It was maybe 2 feet by 4 feet — not even a full countertop — and it felt like we were carrying a small car engine. I think I said something like "this can't be right" and he just laughed and told me granite weighs about 18 to 20 pounds per square foot for a standard slab. I nodded like I understood. I didn't. Not really. It took me getting home and actually doing the math to realize why kitchen installers always show up with three guys and a bunch of suction cups.

That experience is basically why I wrote this.

If you're planning a kitchen remodel, building a vanity, or you're a contractor figuring out whether the existing cabinets can handle a granite top, you need to know the weight. Not a vague sense of "it's heavy" — actual numbers. Because getting this wrong means cracked cabinets, sagging supports, or worse.

How Much Does Granite Actually Weigh?

Granite's density sits in the ballpark of 168 pounds per cubic foot, give or take depending on the specific stone. Some exotic varieties are a bit denser, some domestic ones a touch lighter, but 168 is the number most fabricators and engineers use. The thing is, nobody buys granite by the cubic foot — you buy it by the slab, and slabs come in specific thicknesses. That thickness is what really drives the per-square-foot weight.

Slab Thickness	Thickness (inches)	Weight per Sq Ft (lbs)	Common Use
2 cm	~0.79"	About 12.8	Backsplashes, wall cladding
3 cm (standard)	~1.18"	About 18-20	Kitchen countertops, islands
4 cm	~1.57"	About 25	Heavy-duty surfaces, commercial
6 cm	~2.36"	About 38	Outdoor kitchens, specialty applications

Most residential kitchen countertops use 3 cm granite. That's the standard. So when someone says "granite weighs about 19 pounds per square foot," they're talking about a 3 cm slab — roughly an inch and a quarter thick.

But here's where people get tripped up.

They forget that a typical kitchen countertop isn't just 10 or 15 square feet. Once you account for the L-shape, the island, the little peninsula by the breakfast nook, and the backsplash pieces, you're often looking at 40 to 60 square feet of granite. And at 19 pounds per square foot, a 50 square foot countertop weighs around 950 pounds. That's a lot of stone! Your cabinets need to handle that, your floor structure needs to handle that, and the guys carrying it through your front door definitely need to know about it.

So if you've got an 8-foot run of countertop that's 25.5 inches deep (which is standard — about 2.125 feet), the math goes: 8 × 2.125 × 19 = roughly 323 pounds for that one section alone. And that's before the cutout for the sink, which admittedly removes some weight, but not as much as you'd hope.

I built a

for exactly this kind of thing because honestly, doing it by hand for every section of countertop gets tedious fast.

Can Your Cabinets Handle It?

This is the question that matters most, and it's the one most homeowners skip right over.

Standard kitchen cabinets — the kind you'd get from a big box store — are generally rated for somewhere around 500 to 1,000 pounds across a full run, depending on the manufacturer and how they're installed. That sounds like plenty until you add the granite, plus dishes, plus a cast iron sink (those weigh 60 to 80 pounds by themselves), plus whatever else ends up in there. It adds up fast.

Custom cabinets and plywood-box cabinets handle the load much better than particleboard ones. If you're putting granite on particleboard cabinets, I'd seriously think twice — or at minimum, add some reinforcement underneath. I've seen particleboard cabinets bow and warp under granite over time, and it's not pretty. The fix is expensive too, because you basically have to pull the countertop off (remember, 950 pounds) to replace the cabinets.

A few things I always check on job sites:

• Are the cabinets screwed into studs, not just drywall anchors?
• Is there a continuous plywood subtop across the cabinet boxes? (This distributes the load way better.)
• Corner cabinets — these are sneaky weak points
• The floor underneath, especially on upper stories — is the subfloor rated for the concentrated load?

If you're doing a

instead, the weight math is similar but concrete is actually a bit lighter per cubic foot than granite (about 150 vs 168). Still heavy though.

Granite vs. Other Countertop Materials

People always ask me how granite compares to quartz or marble weight-wise, and the answer is: they're all pretty close, honestly. Marble is slightly lighter, quartz engineered stone is in the same neighborhood, and soapstone is a touch heavier. The real outlier is laminate, which weighs basically nothing by comparison.

Material	Approx. Weight per Sq Ft (3 cm)	Density (lbs/cu ft)
Granite	~19	~168
Marble	~16-17	~160
Quartz (engineered)	~18-20	~165
Soapstone	~20-21	~175
Concrete	~17-18	~150
Laminate	~2-4	~30

So if weight is your primary concern — like you're dealing with older cabinets or a tricky structural situation — switching from granite to marble saves you maybe 2 pounds per square foot. Over 50 square feet, that's 100 pounds. Not nothing, but not a game-changer either. Switching to laminate, on the other hand, saves you like 750 pounds. That's a completely different conversation.

For material quantity planning, our

helps you figure out exactly how much surface area you're working with. And if you're budgeting the whole project, the

is worth a look too.

You might also want to check structural capacity with a

if you're worried about floor joists or cabinet ratings. And for anyone doing tile backsplash alongside the granite, the

can save you from buying three extra boxes of subway tile you don't need.

Does a sink cutout significantly reduce the countertop weight?

A little bit, but less than you'd think. A standard undermount sink cutout removes maybe 3 to 4 square feet of granite, which works out to roughly 60-75 pounds for a 3 cm slab. That's helpful, but the remaining slab around the cutout still concentrates a lot of weight on the cabinet below. So you can't really count on the cutout to solve a structural problem.

Can I put granite countertops on a second floor?

Yes — but check your floor joists first. Most modern homes with 2×10 joists on 16-inch centers can handle it fine. Older homes with undersized joists or wider spacing might need sistering (adding new joists alongside the old ones). If you're unsure, get an engineer to look at it. Seriously. It's a couple hundred bucks and worth every penny compared to a sagging floor.

How many people does it take to carry a granite countertop?

For a full slab? At least 3-4 people, plus suction cup handles and an A-frame cart. A full uncut slab (roughly 5 ft × 9 ft at 3 cm) weighs around 850 to 950 pounds. Even cut sections for a typical kitchen run need at least two strong people per piece. Don't try to hero it.

If you're deep in the planning phase of a kitchen or bathroom project, knowing your

between metric and imperial slab thicknesses will save you some headaches — especially when you're comparing quotes from different fabricators who can't seem to agree on whether to use centimeters or inches.