Key Takeaways
- Crushed stone and gravel are almost always sold and delivered by the ton, not by the yard — unlike mulch or topsoil.
- The stone tonnage formula is: Tons = (Area sq ft × Depth in ÷ 12) × Density (lb/cu ft) ÷ 2,000.
- Standard crushed stone weighs approximately 2,700 lbs per cubic yard (100 lb/cu ft) — but density varies by 15%+ between stone types.
- Recommended depth varies by use: 2 inches for top-dressing, 3–4 inches for walkways and paths, 4–6 inches for driveway base layers.
- Always add a 10% buffer for compaction — loose stone settles significantly once driven or walked on.
Table of Contents
- How Much Stone Do I Need?
- Stone Calculator in Tons
- Crushed Stone Calculator for Driveways
- Gravel and Stone Calculator — What’s the Difference?
- Landscape Stone Calculator for Gardens & Paths
- Stone Calculator by the Yard
- Stone Density & Coverage Reference Table
- Tips & Common Mistakes
- Frequently Asked Questions
- Related Calculators
How Much Stone Do I Need?
Calculating how much stone you need requires three numbers: the area you’re covering, the depth of the stone layer, and the density of your chosen stone type. Unlike mulch or topsoil, crushed stone and gravel are almost always sold and delivered by the ton, since stone is dense and weight-based pricing reflects the actual cost of moving and delivering the material.
Tons = (Area sq ft × Depth in ÷ 12) × Density (lb/cu ft) ÷ 2,000
Standard crushed stone density: 100 lb/cu ft (2,700 lb/cu yd)
Example: A walkway 40 ft × 4 ft at 3 inches deep, using standard crushed stone. Area = 160 sq ft. Volume = 160 × (3÷12) = 40 cu ft. Weight = 40 × 100 = 4,000 lbs. Tons = 4,000 ÷ 2,000 = 2 tons. Adding a 10% compaction buffer brings the recommended order to about 2.2 tons.
Stone Calculator in Tons
Our stone calculator in tons (the Tons tab above) is the primary tool for ordering crushed stone, gravel, river rock, rip rap, or decomposed granite. Select your stone type from the dropdown for an accurate density, enter your dimensions and depth, and get an exact tonnage with a 10% compaction buffer already applied.
Most suppliers have a minimum delivery (often 1–3 tons) and charge per ton plus a delivery fee. Calculating your exact tonnage before calling avoids both under-ordering (requiring a costly second delivery) and over-ordering (paying for material you don’t need).
Crushed Stone Calculator for Driveways
Driveways typically use a two-layer or three-layer system: a larger base stone (#2 or #3 stone, sometimes called “crusher run”) for structural support, followed by a smaller surface stone (#57 or #8) for the finished walking and driving surface.
Typical Driveway Stone Depths
- Base layer: 4–6 inches of larger crushed stone (#2, #3, or crusher run) compacted into the subgrade
- Surface layer: 2 inches of smaller, more decorative stone (#57, #8, or pea gravel)
- Total depth: 6–8 inches combined for a residential driveway that will handle regular vehicle traffic
Calculate each layer separately using our Tons tab — select the appropriate stone type and depth for the base, then run the calculation again for the surface layer with its own depth and stone type, and add the two tonnage results together.
According to the Portland Cement Association’s paving resources, a properly compacted aggregate base is critical to driveway longevity — without it, even a well-maintained gravel surface will rut and shift under regular vehicle loads.
Gravel and Stone Calculator — What’s the Difference?
“Gravel” and “stone” are often used interchangeably, but there are practical differences that affect your calculation and project outcome:
| Material | Description | Common Uses |
|---|---|---|
| Crushed stone | Mechanically crushed rock with angular edges; locks together when compacted | Driveways, drainage, structural base |
| Pea gravel | Small, naturally rounded stones (~3/8″); doesn’t compact or lock together | Walkways, decorative beds, playgrounds |
| River rock | Larger rounded stones, naturally smoothed by water | Decorative borders, dry creek beds, drainage |
| Crusher run / road base | Crushed stone with rock dust/fines mixed in; compacts very hard | Driveway and patio base layers |
| Rip rap | Large angular rocks (4″+) | Erosion control, slopes, retaining walls |
The key practical implication: crushed stone and crusher run compact and lock together (good for structural base layers), while pea gravel and river rock stay loose (good for decorative surfaces but not for load-bearing applications like under a driveway).
Landscape Stone Calculator for Gardens & Paths
For garden paths, decorative beds, and dry creek beds, the depth and stone type choices differ from structural driveway applications. A landscape stone calculator for these projects typically uses shallower depths and more decorative materials.
Recommended Depths for Landscape Applications
- Decorative top-dress over mulch/soil: 1–2 inches
- Garden path (foot traffic only): 2–3 inches
- Dry creek bed: 3–4 inches, often with larger rock mixed with river rock for visual variety
- Around plants and drainage areas: 2–3 inches, with landscape fabric underneath to prevent weed growth and soil mixing
Stone Calculator by the Yard
While most crushed stone is sold by the ton, some landscape supply yards — particularly for decorative or specialty stone like polished river rock, colored gravel, or boulders — price by the cubic yard instead.
Cubic Yards = (Area sq ft × Depth in) ÷ 324
Example: A 20 ft × 5 ft decorative stone border at 3 inches deep. Cubic Yards = (20 × 5 × 3) ÷ 324 = 300 ÷ 324 = 0.93 cubic yards, which rounds up to 1 cubic yard for ordering. Use our Cubic Yards tab to calculate this directly, with an approximate ton-equivalent shown for comparing prices between suppliers who quote differently.
Stone Density & Coverage Reference Table
| Stone Type | Density (lb/cu ft) | Sq Ft Per Ton (3″ depth) |
|---|---|---|
| Decomposed Granite | 93 lb/cu ft | ~86 sq ft |
| Pea Gravel | 96 lb/cu ft | ~83 sq ft |
| Crushed Stone (#57, #4) | 100 lb/cu ft | ~80 sq ft |
| River Rock | 104 lb/cu ft | ~77 sq ft |
| Rip Rap | 111 lb/cu ft | ~72 sq ft |
| Road Base / Crusher Run | 148 lb/cu ft | ~54 sq ft |
Notice that denser materials (rip rap, crusher run) cover less area per ton at the same depth — you need more weight to fill the same volume. Our calculator’s stone type dropdown applies the correct density automatically.
Tips & Common Mistakes
| Common Mistake | What to Do Instead |
|---|---|
| Using one density figure for all stone types | Density varies up to 50% between stone types (93–148 lb/cu ft). Always select the correct stone type before calculating tonnage. |
| Not accounting for compaction | Loose stone settles 10%+ once compacted or driven on. Always add a 10% buffer to your exact calculation. |
| Using decorative stone (pea gravel, river rock) as a structural base | Rounded stones don’t compact or interlock. Use angular crushed stone or crusher run for any load-bearing base layer. |
| Skipping landscape fabric under decorative stone | Without a weed barrier, stone sinks into soil and weeds grow through within a few seasons, requiring a full redo. |
| Confusing tons and cubic yards when comparing supplier quotes | Some suppliers quote by the ton, others by the yard. Use our calculator’s approximate tons-per-yard conversion to compare quotes on an apples-to-apples basis. |
Frequently Asked Questions
How much stone do I need for my driveway?
Calculate area (length × width), multiply by your desired depth in feet (depth in inches ÷ 12), then multiply by your stone’s density and divide by 2,000 for tons. A standard driveway needs 4–6 inches of base stone plus 2 inches of surface stone — calculate each layer separately and add the tonnage together. Use our Tons tab above with the appropriate stone type selected for each layer.
How many square feet does a ton of gravel cover?
At standard crushed stone density (100 lb/cu ft) and a 3-inch depth, one ton covers approximately 80 square feet. At 2 inches deep, one ton covers about 120 sq ft. At 4 inches deep, about 60 sq ft. Coverage varies by stone type — denser materials like rip rap cover less area per ton. Use our calculator’s stone type dropdown for an accurate figure for your specific material.
Is crushed stone sold by the ton or the yard?
Crushed stone and gravel are almost always sold and delivered by the ton in the United States, since weight reflects the actual hauling cost. Some specialty decorative stone (polished river rock, boulders, colored gravel) is sometimes sold by the cubic yard instead. Always confirm with your specific supplier — use our calculator’s both Tons and Cubic Yards tabs to get figures for either pricing method.
What is the difference between crushed stone and gravel?
Crushed stone is mechanically crushed rock with angular edges that lock together when compacted, making it ideal for driveways and structural bases. Gravel typically refers to naturally rounded stones (like pea gravel) that don’t compact or interlock as effectively — better suited for decorative surfaces, walkways, and drainage areas rather than load-bearing applications.
How deep should crushed stone be for a driveway?
A residential driveway typically needs 4–6 inches of base stone (crusher run or larger crushed stone, #2 or #3) compacted into the subgrade, plus 2 inches of surface stone (#57 or smaller) on top — a total depth of 6–8 inches. Heavier vehicle traffic or poor soil conditions may require a deeper base. Always compact each layer before adding the next.
Related Calculators
If this stone calculator helped you plan your project, these tools are useful for related construction and landscaping estimates:
- Cubic Yard Calculator — calculate cubic yards of concrete, dirt, or other bulk material for the same project.
- Mulch Calculator — for mulched garden beds adjacent to stone pathways or borders.
- Asphalt Calculator — compare a paved driveway to a gravel driveway in cost and material needed.
- Square Footage Calculator — measure any irregular driveway or path area before calculating stone tonnage.
Whether you’re building a new driveway, laying a garden path, or finishing a decorative landscape feature, an accurate stone calculator takes the guesswork out of ordering. Use the Tons tab for standard crushed stone and gravel orders, the Cubic Yards tab for suppliers that price by volume, or the Multi-Zone tab to plan a project with several different areas — then order with confidence.