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.
Assumptions to Check
Before ordering materials, confirm the dimensions, product coverage, waste factor, and local installation requirements for your project. Manufacturer coverage tables and local code rules can change the final quantity, especially for structural work, exterior projects, and irregular layouts.
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