Size a driveway or parking pad and plan the concrete order, road base, reinforcement, joints, and pour conditions.
The driveway calculator starts with a two-car 30 × 20 ft preset at 5 inches thick, a 6-inch road-base layer, 4000 psi concrete, a rebar grid, and a 10% order allowance. Change any input to match a single-car drive, parking pad, apron, wide driveway, or heavier RV and pickup area. Results include cubic yards, bag counts, ready-mix planning, base volume, reinforcement, forms, joints, and rough material cost.
Measure the actual paved footprint and separate sections with different thicknesses. Aprons, thickened edges, slopes, drains, and transitions can add concrete beyond a simple rectangle. The built-in presets range from light single-car use to 6-inch heavy-vehicle sections, but they remain planning examples. Vehicle weight, subgrade strength, drainage, freeze-thaw exposure, reinforcement, and municipal apron rules can require a different design.
Control joints are planned at roughly 24 times slab thickness and capped to the slab dimensions. The calculator also flags thin driveway selections and can add climate and de-icing-salt context after a ZIP code is entered. Confirm concrete strength, air entrainment, order quantity, access, short-load charges, and discharge timing with the ready-mix supplier.
At 5 inches thick, the design volume is about 6.17 cubic yards before waste. A 10% allowance brings the planning order to about 6.79 cubic yards.
The calculator includes a light-use 4-inch preset and stronger 5- and 6-inch presets. The right section depends on vehicles, base support, drainage, climate, and local requirements.