Concrete Driveway Calculator — ft, yd³, cost
How to use this calculator
Choose a driveway shape — straight rectangle, flared (wider at street), curved (approximate), or custom area — then set the concrete thickness (4–6″ typical) and waste allowance. Enable optional sections for subbase gravel, rebar/mesh, control joints, and full cost breakdown.
Thickness — 4″ minimum for cars, 5–6″ for trucks/RVs. Subbase — 4″ compacted gravel recommended. Joints — control joints every 10 ft to prevent cracking. Finish — broom finish (standard), exposed aggregate, or stamped.
Saved Calculations
| Time | Shape | Area ft² | Concrete yd³ | Gravel yd³ | Joints lf | Total $ |
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How to Calculate Concrete for a Driveway
This calculator estimates concrete volume, gravel subbase, reinforcement, control joints, and total cost for residential driveways. Choose from straight, flared, curved, or custom area shapes. Standard residential thickness is 4–6 inches per ACI 318-19.
Formulas
Concrete volume = Area × Thickness ÷ 27 (yd³). Gravel volume = Area × Gravel depth ÷ 27. Control joint length = number of transverse cuts × width + number of longitudinal cuts × length. Joint spacing = slab thickness (in) × 2.5 (max 10 ft).
Reinforcement Options
Welded wire mesh (6×6 W1.4/W1.4): standard for driveways, 5×10 ft sheets. Rebar #3 or #4 at 12″ o.c. both ways for heavy-duty. Fiber mesh: added to the mix at ~1.5 lb/yd³.
FAQ
How thick for a driveway? 4″ minimum for cars, 5–6″ for trucks/RVs/heavy vehicles. Do I need gravel? Yes, 4″ compacted gravel or crushed stone provides drainage and prevents settling. Control joints? Cut every 8–10 ft to control cracking. Depth should be ¼ of slab thickness.
