Gravel orders are often quoted in cubic yards or tons. A volume estimate is based on the surface area and installation depth; a weight estimate adds the aggregate’s density. Different gravel types and moisture levels make a universal ton-per-yard figure unreliable.
Worked volume example
Suppose a small project area is 20 × 10 ft, with a planned gravel depth of 4 inches. Convert 4 inches to 4/12 = 0.333 ft. The volume is 20 × 10 × 0.333 = approximately 66.67 cubic feet. Divide by 27: approximately 2.47 cubic yards before any allowance.
Include a realistic allowance
An illustrative 5% additional volume gives 2.47 × 1.05 ≈ 2.59 cubic yards. This is a purchasing estimate rather than a prediction of how much the compacted layer will occupy. Surface irregularities, compaction, subgrade preparation and aggregate grading all matter.
Convert to tonnage carefully
If your supplier tells you the product weighs 1.4 US short tons per cubic yard, 2.59 × 1.4 ≈ 3.63 short tons. If their material density differs, the tonnage changes proportionally. Be clear whether the quote uses US short tons, metric tonnes or another unit.
Before you order
Verify the design depth, subgrade requirements, drainage and suitable aggregate for the intended use. A driveway carrying vehicles may have site-specific structural requirements beyond a material quantity estimate.
Use the tool
Enter your measurements, depth and confirmed supplier density into the Gravel Calculator. Check its calculation against the quote’s units before agreeing to delivery.
Second example: a thin gravel layer
For a rectangular 18 × 10 ft area at a planned depth of 3 inches, first convert depth to feet: 3 ÷ 12 = 0.25 ft. The volume is 18 × 10 × 0.25 = 45 cubic feet. Since one cubic yard is 27 cubic feet, that equals 1.67 cubic yards before any extra allowance.
An illustrative 7% allowance gives 45 × 1.07 = 48.15 cubic feet, or 1.78 cubic yards. If, and only if, the supplier states that the specific aggregate weighs 1.5 US short tons per cubic yard, the corresponding weight estimate is about 1.78 × 1.5 = 2.68 short tons. The 1.5 figure is a hypothetical supplier rate, not a universal gravel density.
Cubic yards and tons answer different questions
| Unit | What it describes | What to verify |
|---|---|---|
| Cubic yards | Volume | Target depth and area |
| US short tons | Weight; 2,000 lb each | Aggregate density and delivery units |
| Metric tonnes | Weight; 1,000 kg each | Supplier quote, not a US-ton assumption |
Loose deliveries versus installed depth
Some estimates describe a final compacted layer, while others describe loose material delivered by a truck. Those quantities may not match. Subgrade shape, compaction, stone gradation and drainage can affect the project. Verify with the contractor whether the specified layer thickness is before or after compaction, and use the supplier’s material-specific conversion.
Quote checklist
- Record length, width and depth in consistent units.
- Ask whether the delivery is measured by cubic yard, short ton or metric tonne.
- Ask for the actual product density or supplier conversion for the named stone.
- Check delivery minimums and whether freight is included separately.
Run both volume and supplier-provided weight figures through the Gravel Calculator. For an organic landscaping material, see our separate mulch volume guide.
MaterialRaft provides planning estimates, not guaranteed installation quantities. Verify measurements, product data and local requirements.