Gravel & Stone Calculator
Adjust the parameters below to compute materials and estimate project costs.
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Breakdown Details
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Guidelines & Field Recommendations
• 2 inches: Walkways and decorative beds.
• 4 inches: Under patios and slabs.
• 6 inches: Gravel driveways.
Tamping: Loose gravel compacts down by 10-20% when rolled or tamped.
Calculation Formulas & Steps
Cubic Yards = Area × Depth (ft) ÷ 27. Weight (Tons) = Cubic Feet × Density (lbs/cu ft) ÷ 2,000.
Worked Example (Step-by-Step Math)
Multiply area by depth.
30 ft × 4 ft × (4/12) ft = 40 cu ftMultiply volume by density, divide by 2000.
(40 cu ft × 105 lbs/cu ft) ÷ 2,000 = 2.10 tonsGravel settles when compacted.
2.10 tons × 1.10 = 2.31 tonsStone Weight Yields
Estimated weights per cubic yard.
| Project Condition | Reference Metric |
|---|---|
| Crushed Limestone | 1.4 tons per cubic yard |
| River Rock / Gravel | 1.35 tons per cubic yard |
Critical Mistakes to Avoid
- !Mistake 1: Forgetting that loose stone compacts down by 10-20% when rolled or walked on.
- !Mistake 2: Laying rocks on soil without landscape fabric, causing them to sink.
Frequently Asked Questions
How do I convert gravel weight in tons to volume in cubic yards?
On average, one cubic yard of gravel weighs about 1.4 tons (or 2,800 lbs). To convert, multiply cubic yards by 1.4 to estimate required tons. Conversely, divide tons by 1.4 to find cubic yards.
What is the average density of crushed stone per cubic foot?
Standard crushed limestone has a density of approximately 105 lbs per cubic foot. Fine sand or crusher run is denser (110 lbs/cu ft) because the particles pack closer, while pea gravel is lighter (95 lbs/cu ft) due to air gaps.
What is the best gravel size for a residential driveway?
The best gravel for a driveway is a three-layer system: a base of 3-to-4-inch stone, a middle layer of 2-to-3-inch crushed stone, and a top surface layer of 3/4-inch crushed gravel with fines (crusher run). The fines pack flat, creating a stable surface that doesn't slide under tires.
How do I calculate the total gravel tonnage required for a road?
To find gravel tonnage, multiply length (ft) × width (ft) × depth (converted to feet) to find cubic feet. Multiply cubic feet by 105 lbs/cu ft (standard gravel density) to get total pounds, then divide by 2,000 to find tons. Add 10-15% for compaction settling.
What is the cost comparison between pea gravel and river rock per ton?
Pea gravel and river rock are similar in price, ranging from $35 to $60 per ton at quarry wholesale. However, delivery fees and bagging markups can increase the retail cost to $80 to $120 per ton when purchased from garden centers.
What size gravel is best for garden walkways and paths?
Pea gravel (3/8") or 3/4" crushed stone are optimal for comfortable walking walkways.
Why does gravel need a compaction buffer when calculated?
When you tamp or roll gravel, the pieces lock together and air pockets collapse. Adding 10% more volume prevents the finished layer from sitting too low.
Complete Tools Checklist
- Rake
- Plate Compactor
- Wheelbarrow
- Shovel
- Landscape Fabric