Driveway Gravel Calculator
Calculate gravel tonnage across the professional 3-layer driveway foundation system.
Driveway Gravel Calculator Interactive Tool
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Per-Layer Depths & Densities
Results
16.67 cu yd
Geometric volume before compaction18.33 cu yd
Includes +10% compaction allowance25.9 tons
Across all 3 layers (9" total depth)| Driveway Course | Recommended Stone | Depth | Base Volume | Adjusted Volume | Tons to Order |
|---|---|---|---|---|---|
| Base Foundation Layer | #3 Crushed Stone (1.5" - 2.5") | 4" | 7.41 yd³ | 8.15 yd³ | 11.8 tons |
| Middle Choke Layer | #57 Crushed Stone (0.5" - 1") | 3" | 5.56 yd³ | 6.11 yd³ | 8.6 tons |
| Top Surface Layer | Crusher Run / Pea Gravel / DGA | 2" | 3.7 yd³ | 4.07 yd³ | 5.5 tons |
Multi-Layer Driveway System Formulas
Layer cu yd = (Length × Width × (Layer Depth ÷ 12)) ÷ 27 × (1 + Waste %) | Layer Tons = Layer cu yd × Layer DensityFormula Variables:
- Base Layer (#3 stone):4–6" of 1.5" to 2.5" coarse crushed stone for drainage and heavy vehicle support (1.45 tons/yd³).
- Middle Layer (#57 stone):3–4" of 0.5" to 1" angular stone that locks into the base layer (1.40 tons/yd³).
- Surface Layer (Crusher Run):2" of dense graded aggregate with stone dust to bind into a hard driving surface (1.35 tons/yd³).
Single-layer gravel driveways quickly turn into mud ruts. A proper 3-layer cross-section distributes 8,000+ lb axle loads.
Step-by-Step Worked Example
Example: 12 × 60 ft rural driveway with 4" base, 3" middle, and 2" surface layer
Installing a durable 720 sq ft gravel driveway designed for daily pickup truck and delivery vehicle traffic.
- Base Layer: 720 × (4 ÷ 12) = 240 cu ft = 8.89 cu yd × 1.10 = 9.78 cu yd × 1.45 tons/yd³ = 14.18 tons.
- Middle Layer: 720 × (3 ÷ 12) = 180 cu ft = 6.67 cu yd × 1.10 = 7.33 cu yd × 1.40 tons/yd³ = 10.26 tons.
- Surface Layer: 720 × (2 ÷ 12) = 120 cu ft = 4.44 cu yd × 1.10 = 4.89 cu yd × 1.35 tons/yd³ = 6.60 tons.
- Total volume: 9.78 + 7.33 + 4.89 = 22.00 cubic yards.
- Total tonnage: 14.18 + 10.26 + 6.60 = 31.04 tons.
Input Explanations & Measurement Guidelines
Driveway Length & Width
Typical: 12 ft wide × 50 to 100 ft longCenterline length and finished width of vehicle lanes.
Base Layer Depth
Typical: 4 to 6 inchesCoarse crushed foundation stone depth.
Middle Layer Depth
Typical: 3 inchesMedium interlocking stone depth.
Surface Layer Depth
Typical: 2 inchesTop compacting wear layer depth.
Assumptions & Limitations
- Excavation removes organic topsoil down to load-bearing subsoil.
- Geotextile driveway fabric is installed under the base layer to prevent rocks from punching into soft subgrade.
Safety & Professional Notes
- Maintain a 2%–3% crown (higher center sloping gently to sides) so rainwater sheds off instead of creating pothole-forming puddles.
How to Measure for Gravel: Steps, Depth Guidelines & Bulk Ordering
Accurately measuring the ground footprint before ordering bulk gravel saves hundreds of dollars in excess delivery fees or premature shortages. This guide breaks down geometric measurement methods and compaction rules.
Frequently Asked Questions
What is the best gravel for the top layer of a driveway?
Crusher run (also known as DGA, quarry process, or road base) contains a mixture of 3/4-inch angular stone down to fine stone dust. When compacted, the dust binds the stones into a solid, asphalt-like crust.
How thick should a gravel driveway be in total?
For standard passenger cars and SUVs, 8 to 9 total inches across three compacted layers is recommended. For heavy commercial vehicles or RVs, 10 to 12 inches is standard.