Marble, granite and quartz countertops are usually around 1 and ¼ inch thick when used in kitchens as countertops or kitchen island worktops. For bathrooms, the thickness can drop to about ¾ inch. But there are no set rules about the thickness of countertops. You can go with a thickness that you think is right for your kitchen or bathroom.
While very thin countertops may end up getting cracked easily, thicker ones are more durable. These days, lots of modern homeowners are beginning to ask for countertops as thick as 2 inches.
It looks bold and gives the kitchen or bathroom a more pronounced look. When you are looking at the marble or granite slabs, look for patterns and colors and then decide the thickness.