How much area does gravel cover?
Coverage depends on weight, density, and depth. For example, 1 ton at 2,800 lb per cubic yard spread 3 inches deep covers about 77 sq ft before compaction adjustments.
Depth changes coverage quickly
The same stone covers more area at a shallow decorative depth and less area at a thicker drainage or base depth. Calculate separate zones when depths differ.
Density matters for ton-based coverage
Tons are weight, not volume. Supplier density is the best input for converting stone tons into cubic yards and coverage area.
Common density planning values
Use supplier-provided density for final tonnage. These broad values are planning placeholders, not product specifications.
| Material | Broad planning density | Notes |
|---|---|---|
| Gravel / crushed stone | 2,600-3,000 lb/cu yd | Varies by gradation, moisture, and compaction. |
| Sand | 2,400-3,000 lb/cu yd | Moisture can noticeably change weight. |
| Topsoil / dirt | 1,800-2,600 lb/cu yd | Moisture and organic matter change density. |
| Mulch | 400-1,000 lb/cu yd | Usually ordered by volume, not weight. |
| Compost | 800-1,500 lb/cu yd | Depends on moisture and material mix. |
Before you calculate
- Measure the coverage area in square feet before choosing depth.
- Use inches for depth so the calculator can convert area into volume.
- Separate beds, paths, and irregular zones when depths are different.
Common mistakes
- Using the same depth for every area when the project has different zones.
- Ignoring compaction, settling, or uneven ground.
- Mixing bulk cubic-yard estimates with bag coverage without checking the product label.
Formula
coverage sq ft = ((weightTons * 2000 / densityPerCubicYard) * 27) / (depth / 12)
Assumptions
- Density varies by supplier, moisture, screening size, and compaction.
- Coverage depends on depth, so compare the calculator depth with the actual layer plan.
- Use supplier weight-to-volume guidance for final ordering.
Example
Estimated 4 tons decomposed granite coverage: 320 sq ft
How to calculate 4 tons decomposed granite coverage
- Convert the entered material weight to volume using supplier density.
- Convert the target depth from inches to feet.
- Divide cubic feet by depth in feet to estimate square-foot coverage.
- Use separate estimates for different depths or material zones.
- Adjust for compaction, moisture, uneven grade, and product-specific coverage before buying.
Before you buy materials
- Bulk material may settle or compact after spreading.
- Round up to match bag, scoop, or delivery increments.
FAQ
What is the example 4 tons decomposed granite square-foot result?
Use material weight, depth, density, then calculate the planning result. In the default example, the result is 320 sq ft.
How do I calculate gravel coverage?
Convert tons to cubic yards using density, multiply cubic yards by 27 to get cubic feet, then divide by depth in feet.
How many square feet does 1 cubic yard of stone cover?
One cubic yard covers about 162 sq ft at 2 inches deep, 108 sq ft at 3 inches, or 81 sq ft at 4 inches before waste.
How many square feet does 1 ton of stone cover?
It depends on density and depth. At 2,800 lb per cubic yard, 1 ton covers about 77 sq ft at 3 inches deep before waste.
Should I include compaction or waste?
Yes for base layers, drainage stone, uneven grade, and delivery loss. Decorative stone may also need visual adjustment.
Related calculators
This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.