Road Base vs Top Gravel Dual-Layer Estimator
Calculate tonnage for both the compacted sub-base (road bond) and the clean decorative gravel surface in a single run.
1. Select Project Shape
2. Enter Dimensions
3. Select Gravel Aggregate & Density
4. Add Waste & Compaction Buffer
Gravel Layer & Excavation Cross-Section Simulator
Visualize multi-layer ground excavation, plate compaction settling, and dump truck hauling logistics in real-time.
To achieve a final compacted depth of 6.0 inches, you must spread 7.1 inches of loose uncompacted aggregate before running the plate compactor.
Recommended Depth & Base Specifications for Road Base vs Top Gravel Calculator
Selecting the proper installation depth is the single most critical factor in preventing premature rutting, sinking, or weed breakthrough.
| Layer / Application | Recommended Depth | Stone Aggregate Type | Contractor Notes |
|---|---|---|---|
| Base Layer (DGA / Road Base) | 4 Inches | Crusher Run 21A | Tightly compacted to distribute vehicle weight across soil. |
| Top Layer (Surface Stone) | 2 Inches | #57 Crushed Granite / Pea Rock | Free-draining layer that eliminates muddy tire tracks. |
💡 Contractor Installation Pro Tips
- Installing top gravel directly on dirt without a base layer causes gravel to sink 2 inches into mud every rainy season.
Frequently Asked Questions About Road Base vs Top Gravel Calculator
Why not just use 6 inches of decorative gravel?
6 inches of clean loose gravel will make cars lose traction and spin tires like driving in loose beach sand; the solid base course provides structural hardness.
Missing a Stone Type or Have Feedback?
We update density presets and formulas regularly based on local quarry feedback.