Quick Answer
Gravel Calculator Gravel Calculator calculates gravel volume by multiplying length × width × thickness, then converting to cubic yards and tons based on gravel type density.
Typical result: For a typical 20 ft × 10 ft driveway at 4 inches thick, you need about 2.5 cubic yards or about 3.4 tons of crushed stone gravel.
Range: One ton of crushed stone covers about 100 sq ft at 2 inches thick, or about 50 sq ft at 4 inches thick.
Depends on: gravel type, thickness, area dimensions, and waste factor
How to Use This Gravel Calculator
Enter the dimensions of the area you want to cover, or switch to Total area mode if you already know the square footage. Then enter the material thickness, choose a density preset or custom density, add a waste factor, and optionally enter a price per unit to estimate material cost.
- Select your gravel type (crushed stone, pea gravel, or river rock).
- Enter project dimensions (length × width or total square footage).
- Choose the gravel depth/thickness.
- Select a waste factor (5-10% is common).
- Enter price per ton if you want a material cost estimate.
- Click Calculate to see gravel volume in cubic yards, tons, and estimated cost.
Assumptions & Methodology
This calculator uses standard volumetric estimating and typical gravel density values for material planning. Results are shown in cubic yards, cubic feet, and tons.
Gravel density varies by type: crushed stone (angular, compacts well) is denser than pea gravel (smooth, round). River rock falls between. Select your gravel type for accurate tonnage calculations.
The waste factor helps account for compaction, spillage, uneven surfaces, and settling. A 5–10% waste factor is typical. Use a higher factor for irregular shapes or sloped areas.
| Assumption | Default Value | Notes |
|---|---|---|
| Crushed stone density | 2,700 lb/yd³ (1.35 tons/yd³) | Angular gravel, compacts well for driveways |
| Pea gravel density | 2,400 lb/yd³ (1.2 tons/yd³) | Smooth, round gravel for pathways and decorative use |
| River rock density | 2,600 lb/yd³ (1.3 tons/yd³) | Larger smooth stones for landscaping and drainage |
| Waste factor | 5-10% | Accounts for compaction, spillage, and settling |
| Thickness | User input | Use finished depth after compaction |
Calculation Formula
Volume (cubic feet) = Length (ft) × Width (ft) × Thickness (ft)
Volume (cubic yards) = Volume (cubic feet) ÷ 27
Total Volume = Volume × (1 + Waste Factor)
Tonnage = Cubic Yards × Gravel Density (tons/yd³)
Estimated Cost = Tons × Price Per Ton
Example Estimate
A 20 ft by 10 ft gravel driveway with 4 inches of crushed stone has an area of 200 sq ft and a volume of about 66.67 cubic feet, or about 2.47 cubic yards.
Using crushed stone density (2,700 lb/yd³ = 1.35 tons/yd³), the raw gravel needed is about 3.33 tons.
With a 10% waste factor, the total gravel needed is about 3.67 tons, or about 2.72 cubic yards.
The total material needed is about 3.67 tons.
If crushed stone gravel costs $40 per ton, the estimated material cost would be about $147. This is only an example price. Local gravel prices vary by supplier, region, gravel type, and delivery distance. This does not include delivery, labor, base preparation, or edging.
Quick Reference
| Thickness | Coverage per Ton (Crushed Stone) | Typical Use |
|---|---|---|
| 2 inches | ~100 sq ft | Pathways, decorative landscaping |
| 3 inches | ~65 sq ft | Light-duty walkways, garden beds |
| 4 inches | ~50 sq ft | Residential driveways, parking areas |
| 6 inches | ~35 sq ft | Heavy-duty driveways, commercial use |
| 8 inches | ~25 sq ft | Heavy equipment areas, high-traffic zones |
| Gravel Type | Density (lb/yd³) | Density (tons/yd³) | Best For |
|---|---|---|---|
| Crushed stone | 2,700 | 1.35 | Driveways, parking areas, base layer |
| Pea gravel | 2,400 | 1.2 | Walkways, patios, decorative landscaping |
| River rock | 2,600 | 1.3 | Landscaping, drainage, water features |
| Crushed granite | 2,700 | 1.35 | Driveways, pathways, erosion control |
| Limestone gravel | 2,500 | 1.25 | Driveways, farm roads, base material |
| Project Type | Typical Thickness | Gravel Type | Notes |
|---|---|---|---|
| Residential driveway | 4–6 inches | Crushed stone | Compact in layers for stability |
| Walkway / pathway | 2–3 inches | Pea gravel | Use landscape fabric underneath |
| Drainage area | 4–6 inches | River rock | Larger stones improve water flow |
| Garden bed / mulch | 2–3 inches | Pea gravel or river rock | Decorative and weed suppression |
| Commercial parking | 6–8 inches | Crushed stone | Heavy compaction required |
What Affects Cost?
Gravel material cost is usually estimated by multiplying the required tons by the price per ton. However, the final project cost includes several additional factors beyond just material cost.
Material Cost = Tons × Price Per Ton
The total installed cost typically includes:
- Material cost: Tons × price per ton
- Delivery: Dump truck dispatch and travel time
- Labor: Spreading, grading, and compacting crew
- Base preparation: Excavation, grading, and compaction
- Fabric / geotextile: Weed barrier and stabilization
- Edging / borders: Metal, plastic, or timber edging
- Compaction equipment: Plate compactor or roller rental
- Permits: Local permits for driveways or grading
Choosing the Right Gravel Type
Different gravel types have different properties, costs, and best uses. Use this guide to select the right gravel for your project.
Crushed stone for driveways
Angular edges lock together when compacted, creating a stable surface. Best for driveways, parking areas, and base layers.
Pea gravel for pathways
Smooth, round stones are comfortable to walk on and ideal for walkways, patios, and decorative landscaping. Does not compact as firmly as crushed stone.
River rock for landscaping
Larger smooth stones (1–3 inches) are used for decorative beds, drainage areas, and water features. More expensive than crushed stone.
Gravel Installation Checklist
Before ordering gravel or starting installation, confirm these details to avoid over-ordering or under-ordering.
Total project area
measured in square feet
Gravel thickness
use finished depth after compaction
Gravel type
crushed stone, pea gravel, or river rock
Waste factor
typically 5-10% for rectangular areas, 10-15% for irregular shapes
Base preparation
excavation depth, fabric liner, and compaction plan
Delivery access
dump truck access or wheelbarrow transport distance
Edging plan
metal, plastic, or timber edging to contain gravel
Compaction method
plate compactor rental or hand tamping
Gravel Calculator FAQ
How do I calculate how much gravel I need?
Multiply the length × width × thickness of your project to get the volume in cubic feet, then divide by 27 to get cubic yards. Multiply by gravel density to get tonnage. This calculator handles all unit conversions and density calculations — just select your gravel type and enter dimensions.
Should I order gravel by cubic yards or tons?
Most gravel suppliers sell by the ton (weight), not by cubic yards (volume). Weight is easier to measure accurately. Different gravel types have different densities: crushed stone is about 2,700 lb/yd³, pea gravel is about 2,400 lb/yd³, and river rock is about 2,600 lb/yd³.
What thickness should I use for a gravel driveway?
Typical gravel driveway depth is 4–6 inches for residential use. For heavy vehicles or commercial use, use 6–8 inches. For pathways and decorative landscaping, 2–3 inches is usually sufficient. Always compact the base layer before adding gravel.
How much waste factor should I use?
A 5–10% waste factor is typical for gravel projects. Use 10% for irregular shapes, sloped areas, or when spreading by hand. The waste factor accounts for compaction, spillage, uneven surfaces, and settling.
Why is my contractor's estimate higher than the calculator?
This calculator estimates material quantity only. A contractor's quote includes material cost plus delivery, labor, base preparation (excavation, compaction), fabric/geotextile, edging or borders, and overhead. Always get a detailed written quote before ordering.
What's the difference between crushed stone, pea gravel, and river rock?
Crushed stone has angular edges and compacts well for driveways. Pea gravel is smooth, round, and ideal for walkways and decorative use. River rock is larger, smooth, and used for landscaping and drainage. Each has different density and cost.
How do I convert cubic yards to tons?
Multiply cubic yards by the gravel density. Crushed stone: 1 cubic yard ≈ 1.35 tons. Pea gravel: 1 cubic yard ≈ 1.2 tons. River rock: 1 cubic yard ≈ 1.3 tons. This calculator converts automatically based on your selected gravel type.
Does this calculator include labor or delivery cost?
No. The estimated cost is material cost only, based on tons multiplied by price per ton. It does not include delivery, labor, base preparation, fabric liner, edging, or contractor overhead. Contact a local gravel supplier or contractor for a full project quote.
How accurate is this gravel calculator?
This calculator provides a reasonable planning estimate based on standard volume calculations and typical gravel densities. Actual material needs may vary due to compaction, base conditions, irregular shapes, and settling. Always confirm quantities with your supplier before ordering.
Calculation Methodology
This calculator uses standard volumetric estimating and typical gravel density values for planning purposes. Actual gravel densities may vary by source, moisture content, and compaction. Confirm final quantities with your gravel supplier before ordering.
Reviewed by: Construction Tools Station Editorial Team
Last updated: June 2026