🪨 Gravel Calculator PRO
Multi-layer volume, weight, compaction & delivery calculator with per-material breakdown.
Gravel Bed — updates as you type
Driveway or path area over compacted base. Tonnage follows volume plus the compaction factor.
1 Area Shape
2 Dimensions
3Layer System MULTI-LAYER
Gravel settles 10-15% when compacted. Increase factor to account for loose-to-compacted volume loss.
4 Accessories & Delivery
🧱 Geotextile Fabric (underlayment)
🔲 Edging
🚚 Delivery
5 Cost & Labour
Labour Cost
Results
Per-Layer Breakdown
Total Volume
Total Weight
Compacted vs Loose
Cost Breakdown
⚠️ Pre-Export Checklist
- Dimensions verified on-site
- Sub-base material meets local code requirements
- Compaction factor matches project specification
- Geotextile overlaps minimum 12 inches at seams
- Edging secured with 12-inch stakes
- Delivery access confirmed (truck size & turning radius)
- Waste factor appropriate for site access & terrain
How to Calculate Gravel for a Multi-Layer Project
Show formulas, material guide & worked examples ▼
Volume Formulas
Rectangle:Volume = Length × Width × Depth
Circle:Volume = π × (Diameter / 2)² × Depth
Irregular:Volume = Total Area × Depth (divide into rectangles to find area)
Weight (tons)= Volume (cu yd) × Density (lb/cu yd) ÷ 2,000
Loose Volume= Compacted Volume ÷ (1 - Compaction Factor)
Material Guide
| Material | Density (lb/cu yd) | Best For |
|---|---|---|
| Pea Gravel | 2,500 | Walkways, patios, top layer |
| Crushed Stone | 2,700 | Driveways, base layer |
| River Rock | 2,400 | Landscaping, drainage, top layer |
| Road Base | 2,850 | Driveway sub-base, high compaction |
| Class 5 | 2,800 | Pavement base, sub-grade |
| Crusher Run | 2,900 | Heavy-duty base, compacts tightly |
| Decomposed Granite | 2,200 | Pathways, xeriscaping |
| Marble Chips | 2,600 | Decorative top layer, gardens |
Worked Example: 3-Layer Driveway
12 ft × 20 ft driveway, 3 layers:
- Sub-base (Class 5, 4"): 20 × 12 × (4/12) = 80 cu ft = 2.96 cu yd
- Base (Road Base, 4"): 20 × 12 × (4/12) = 80 cu ft = 2.96 cu yd
- Top (Crushed Stone, 2"): 20 × 12 × (2/12) = 40 cu ft = 1.48 cu yd
- Total compacted: 7.41 cu yd
- With 15% compaction + 10% waste: ~9.6 cu yd loose
- Weight: 9.6 × 2,700 avg density ÷ 2,000 = ~12.9 tons
- Truck (10 yd): 1 trip needed
Compaction Tips
- Compact in 2-inch lifts for maximum density
- Use a plate compactor for gravel up to 6" deep; jump compactor for 8"+
- Crusher run and road base compact the tightest (use 15-25% factor)
- Pea gravel does not compact well — use a lower factor (5-10%)
Common Mistakes to Avoid
- Skipping the geotextile fabric — prevents subgrade mixing and extends lifespan
- Using decorative stone as a base layer — lacks angular edges for interlock
- Ordering loose volume without accounting for compaction factor
- Not ordering enough to cover delivery minimums
- Forgetting edging — gravel migration ruins curb appeal
Drag to rotate — Scroll to zoom
相关计算器
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
我们的免费在线 磨石 计算器可以精确计算您的建筑项目所需的材料数量。无论您是需要driveways, paths, and landscaping的计算器，此工具都可以处理。输入您的项目尺寸即可获得即时结果。
📖 如何使用此 磨石 计算器
如何使用此 {c} 计算器
📐 理解磨石公式
基本公式是：体积 = 长度 × 宽度 × 深度。所有尺寸必须使用相同单位。在得到体积后，转换为所需的单位并加上损耗系数。
⚠️ 应避免的常见错误
估算时未将英寸转换为英尺
✓ 确保所有尺寸使用相同单位。
忽略损耗系数
✓ 始终添加5-10%。
材料计算不准确
✓ 请使用我们的计算器获得精确的数量。
💡 专业提示
始终订购超出计算量的材料。
检查当地建筑规范。
提前订购材料。
❓ 常见问题
输入您的项目尺寸，即可获得材料数量和成本估算。
是的，本计算器适用于各种规模的项目。
🏗️ 实际应用
我们的磨石计算器适用于各种建筑项目。无论是小型修补还是大型施工，此工具都提供准确的估算。
我们的免费磨石计算器是估算driveways, paths, and landscaping最准确的在线工具。
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.