Gravel coverage guide
A ton of gravel covers 114 ft² at 2 inches — until compaction, a wavy subgrade and edge waste take their cut. Here are the honest coverage numbers, per ton and per yard, at every practical depth.
Contents
What a ton of gravel covers
A US ton (2,000 lb) of common gravel at 105 lb/ft³ loose is about 19 cubic feet of stone. Spread thinner, it goes further — coverage scales inversely with depth, so halving the depth doubles the footage. The table gives the straight geometric numbers; the popular “100 ft² per ton at 2 inches” rule of thumb is simply the 2-inch row with a built-in settling margin.
| Depth | Coverage per ton | Where that depth belongs |
|---|---|---|
| 1 inch | ≈ 229 ft² | Refresh top-ups onlyToo thin for new cover — the fabric shows |
| 2 inches | ≈ 114 ft² | Decorative cover over fabricRule of thumb: 100 ft² after allowance |
| 3 inches | ≈ 76 ft² | Paths, patios, pet areas |
| 4 inches | ≈ 57 ft² | One compacted driveway lift |
| 5 inches | ≈ 46 ft² | Heavy-traffic single lift |
| 6 inches | ≈ 38 ft² | Base course, drainage beds |
These figures assume common gravel. Lighter and heavier types shift them — the density chart has the unit weight for every type, and the last section below shows what that does to coverage.
What a cubic yard covers
Per-yard coverage is friendlier than per-ton coverage because it ignores density entirely: a cubic yard is 27 ft³ of any material, so the same table works for pea gravel, crusher run and river rock alike. That makes yards the safer unit when you are still choosing the gravel type.
| Depth | Coverage per cubic yard | Note |
|---|---|---|
| 1 inch | 324 ft² | 27 ft³ ÷ (1/12 ft) |
| 2 inches | 162 ft² | ≈ 1.42 tons of common gravel |
| 3 inches | 108 ft² | The all-purpose landscaping depth |
| 4 inches | 81 ft² | One driveway lift |
| 5 inches | 65 ft² | |
| 6 inches | 54 ft² | Two 3-inch lifts compact better than one 6-inch |
Worked example: sizing a parking pad
A 20 × 24 ft gravel parking pad topped with 3 inches of common gravel over an existing compacted base.
- 1
Area
20 × 24 = 480 ft²
- 2
Tons from the coverage table
480 ÷ 76 ft²/ton = 6.3 tons
- 3
Cross-check in yards
480 × 0.25 ft = 120 ft³ ÷ 27 = 4.4 yd³ (× 1.42 = 6.3 tons ✓)
- 4
Add 10% for settling and edges
6.3 × 1.10 = 6.9 tons
Result: Order 7 tons (about 5 loose cubic yards). The two routes to 6.3 tons agreeing is your arithmetic check.
Coverage questions
What shrinks real-world coverage
Charts describe gravel resting loose on a perfectly flat plane. Real sites take three predictable bites out of that number, and experienced estimators price them in rather than hoping they won't happen.
Irregular subgrade is the second thief. A subgrade that undulates by an inch means your “3-inch” layer is really 2–4 inches — and the low spots must be filled to reach the target surface, consuming stone the flat-plane math never counted. Grading before delivery is cheaper than the extra tonnage it saves. Waste takes the last cut: spillage at the edges, stone trodden into soft ground during spreading, and the material that never quite leaves the truck bed. The standard remedy for all three is a 10% allowance, raised to 15% for compacted crusher run or rough ground — the same allowance built into the five-step calculation method.
Coverage by gravel type
The spread is worth money: a ton of pea gravel covers 45% more area than a ton of compacted crusher run at the same depth. When comparing per-ton quotes across types, convert to cost per covered square foot — the weight chart has the per-yard weights that make the conversion quick.
Keep estimating
Sources & references
- [1]ASTM C29/C29M: Bulk Density (Unit Weight) and Voids in Aggregate — ASTM International, 2017
- [2]Gravel Roads Construction & Maintenance Guide — FHWA / South Dakota LTAP, 2015
- [3]The Aggregates Handbook, 2nd ed. — National Stone, Sand & Gravel Association, 2013