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Granite is sold by the square foot, so it will be helpful to have this information when pricing the material at various dealers. The cost of a granite countertop will, of course, depend on the size of your surface area. However, the average granite countertop will cost approximately $50 to $100 per square foot. In addition to the size, the cost will also depend on how thick you want the slab to be. One way to reduce the cost of a granite countertop is by purchasing your choice through a wholesaler.
Granite Countertop Average Costs. 1  Granite slab starts at $50 to $100 per square foot installed and can cost as much as $150 to $250 per square foot installed. 2  Going the do-it-yourself route, you can buy granite tile for as low as $5 to $10 per square foot and modular granite starting at $25 to $35 per square foot. You can buy a granite slab from a slab yard or similar retailer for $500 to $1,000 or more (or less, depending on the quality and rarity of the granite).