How thick should a concrete driveway be?
Quick Answer
A standard residential concrete driveway should be 4 inches thick for normal passenger vehicles. If you park heavy vehicles like RVs, pickup trucks with trailers, or commercial vehicles, use 5–6 inches. Driveways with poor soil base should also use 6 inches for added strength.
Quick Reference Table
| Use case | Recommended thickness |
|---|---|
| Passenger cars (standard) | 4 inches |
| Pickup trucks / SUVs | 4–5 inches |
| RVs / heavy trucks / trailers | 5–6 inches |
| Commercial / delivery vehicles | 6 inches |
| Poor soil / expansive clay | 6 inches + gravel base |
How to Calculate It Yourself
- 1
Determine your heaviest expected vehicle (passenger car, truck, RV).
- 2
Choose thickness: 4" for cars, 5–6" for heavy vehicles.
- 3
Prepare 4" compacted gravel base under the slab for drainage and stability.
- 4
Calculate volume: length × width × (thickness ÷ 12) = cubic feet ÷ 27 = cubic yards.
- 5
For a 20×20 driveway at 4": 20 × 20 × 0.333 = 133 cu ft ÷ 27 = 5 yd³.
Pro Tip
Use 3,500–4,000 PSI concrete mix for driveways. Add fiber reinforcement instead of wire mesh — it's cheaper, easier to install, and equally effective for residential slabs.
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