Gravel Calculator
Calculate the volume and quantity of gravel or stone needed for driveways, pathways, and landscaping projects.
Formula & Explanation
The gravel calculator determines the volume, quantity, and weight of gravel needed for your project. **Step 1: Calculate Volume in Cubic Feet** Volume (cu ft) = Area (sq ft) × Depth (inches) ÷ 12 Example: 200 sq ft area × 4 inches deep ÷ 12 = 66.67 cubic feet **Step 2: Convert to Cubic Yards** Volume (cu yd) = Volume (cu ft) ÷ 27 Example: 66.67 cu ft ÷ 27 = 2.47 cubic yards **Step 3: Calculate Number of Bags** Bags Needed = ceiling(Volume (cu ft) ÷ Bag size (cu ft)) Example: 66.67 cu ft ÷ 3 cu ft per bag = 22.2, round up to 23 bags **Step 4: Calculate Weight** Weight (tons) = Volume (cu yd) × Density (lb/cu yd) ÷ 2000 Example: 2.47 cu yd × 1500 lb/cu yd ÷ 2000 = 1.85 tons **Important:** Density varies significantly by material type (pea gravel, crushed stone, jersey shore) and moisture content. Always verify density with your supplier for accurate weight estimates.
Assumptions
- •Gravel depth for driveways should be at least 4-6 inches for proper drainage and durability
- •Pea gravel typically weighs 1400-1500 lb per cubic yard; crushed stone ranges from 1400-1600 lb/cy
- •Density varies by material type, moisture content, and compaction level-verify with your supplier
- •Calculation assumes properly compacted gravel; loose gravel may require additional material
- •Crushed stone is better for driveways; pea gravel is better for decorative and walking areas
Example Calculation
A 200 square foot driveway at 4 inches deep requires approximately 1.85 cubic yards (17 bags) or 1.39 tons of gravel.
Inputs
Results
Gravel Types and Density Reference
| type | density_lb_per_cuyd | best_for | notes |
|---|---|---|---|
| Pea gravel | 1400-1500 | Decorative, walkways, pet areas | Smooth, rounded stones |
| Crushed stone ¾" | 1400-1600 | Driveway base, high traffic | Angular, locks together |
| Jersey shore gravel | 1600-1800 | Heavy-duty driveways | Very dense, excellent compaction |
| Marble chips | 1400-1500 | Decorative landscaping | Premium option, white color |
| River rock (1-2") | 1300-1400 | Drainage, decorative | Smooth, larger stones |
Frequently Asked Questions
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