Sizing the pour
A two-car driveway is typically 10 × 20 feet; at the standard 4-inch thickness that's about 2.5 cubic yards — roughly 55 bags, which is exactly the point where bagged concrete stops making sense and a ready-mix truck becomes the right answer. Enter your real dimensions and the calculator draws the line for you.
What a driveway pour needs beyond volume
Driveways carry vehicles, so plan 4 inches minimum over compacted gravel, #4 rebar on 2-foot centers or 6×6 mesh, and control joints every 8–10 feet. Order 10% extra concrete for subgrade soft spots — and schedule the truck for a morning pour so you have full daylight to finish.
Sources and standards
Where these figures come from
Every formula on this page is implemented from the published reference material below. Where a value depends on a regional code, the calculator lets you override it rather than assuming one jurisdiction.
- ASTM International — C94 for ready-mixed concrete, C150 for cement and C143 for slump testing.
- American Concrete Institute — ACI 318 code requirements and ACI 302 slab construction guidance.
- Portland Cement Association — mix design, yield and curing data published by the US cement industry.
Figures, formulas and reference tables last verified: 19 September 2026.