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In most cases, you’ll want your patio to be 4 inches thick, although you should add reinforcement and increase the thickness up to around 8 inches if you want it to support heavier loads and resist cracking more readily. Although thicker slabs will cost more, you’ll start seeing diminishing returns at around 6 inches.

The cost to install a concrete driveway is $4 to $15 per square foot on average. Your price heavily depends on your desired concrete finish and driveway size. 

For a driveway that is 200 square feet, you can expect to pay an average cost of $1,900. For a driveway at double that size (400 square feet), the average price is closer to $3,800. Plain concrete is significantly more cost-effective, averaging $7 per square foot, whereas stained concrete averages around $19 per square foot.

If you're only working with a gravel pad, and there is no concrete foundation, you might be able to upgrade to a concrete slab, but you’d have to speak with a professional concrete expert to confirm and get pricing. If you have a concrete foundation or cement block walls around the area where you want to build flooring, you might be able to pour a new concrete floor over the existing one to forgo repairs. Again, speak with a concrete expert or foundation company to see if this is an option.

A 4-inch-thick concrete slab can support around 4,000 pounds per square foot if a contractor reinforces the slab with rebar, while that same slab without reinforcements will support closer to 1,000 pounds. For the purposes of a patio, 4 inches in thickness without reinforcement should suffice unless you’re installing heavy kitchen equipment or a hot tub on it. In those cases, reinforcing your slab and sticking with 4 inches of thickness should provide plenty of strength.