How much gravel for a 100-foot driveway?
Quick Answer
A 100-foot driveway that is 12 feet wide and 4 inches deep needs approximately 14.8 cubic yards or about 21 tons of gravel. At 6-inch depth (recommended for new driveways), plan on 22 cubic yards or 31 tons.
Quick Reference Table
| Width × depth | Gravel for 100-foot driveway |
|---|---|
| 10 ft wide × 4" deep | 12.4 yd³ / 17 tons |
| 12 ft wide × 4" deep | 14.8 yd³ / 21 tons |
| 12 ft wide × 6" deep | 22.2 yd³ / 31 tons |
| 14 ft wide × 4" deep | 17.3 yd³ / 24 tons |
How to Calculate It Yourself
- 1
Calculate volume: 100 ft × 12 ft × (4" ÷ 12) = 100 × 12 × 0.333 = 400 cu ft.
- 2
Convert to cubic yards: 400 ÷ 27 = 14.8 yd³.
- 3
Convert to tons: 14.8 × 1.4 (tons/yd³ for crushed stone) = 20.7 tons.
- 4
Add 10% for spreading and compaction loss: 20.7 × 1.10 = 22.8 → 23 tons.
Pro Tip
A 100-foot driveway is right on the edge of what's cost-effective to haul in a standard tri-axle truck (14 tons). You'll likely need 2 loads — ask your supplier about the cost difference between 1 large semi-load vs. 2 tri-axle loads.
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