Concrete Driveway Calculators
A driveway is a slab that carries vehicle loads, which means more thickness, more reinforcement and control joints on a tighter spacing than a patio of the same area.
There are 2 calculators here: Concrete Driveway Cost Calculator (concrete, base and cost for a driveway slab) and 20x40 Concrete Driveway Cost Calculator (concrete, base and cost for a 20 by 40 driveway).
They all work the same way: quantity first, then a waste allowance you can change, then a price built from verified figures and adjusted for your state. Cost is always a range rather than a single number, and every assumption behind it is printed on the page with its source and the date it was last checked.