Construction Calculators
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Gravel Calculator
Calculate how much gravel you need for driveways, paths, landscaping, and construction projects. Get volume, tonnage, and cost estimates instantly.
Gravel Volume & Cost Calculator
Calculate gravel requirements for driveways, paths, patios, and landscaping projects
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How to Calculate Gravel
Calculating how much gravel you need involves four straightforward steps. Whether you are planning a driveway, walkway, patio base, or drainage project, following this process ensures you order the right amount of material and avoid costly overages or shortfalls.
Step 1: Measure the Area
Measure the length and width of your project area in feet (or meters). For rectangular spaces, simply record both dimensions. For circular areas such as fire pits or tree rings, measure the diameter and divide by two to get the radius. For irregular shapes, break the area into smaller rectangles or circles and calculate each section separately.
Step 2: Determine the Depth
Decide how deep your gravel layer needs to be. Depth depends on the project type. Driveways typically require 4 to 6 inches, walkways need 2 to 3 inches, and drainage applications may require 6 to 12 inches. Convert inches to feet by dividing by 12 (for example, 4 inches = 0.333 feet).
Step 3: Calculate the Volume
For a rectangular area, multiply length × width × depth (all in feet) to get cubic feet. Divide by 27 to convert to cubic yards, which is the standard ordering unit for bulk gravel. For a circular area, use the formula: π × radius² × depth. One cubic yard equals approximately 27 cubic feet, and one cubic meter equals about 35.3 cubic feet.
Step 4: Convert Volume to Weight
Gravel suppliers typically sell by the ton rather than by volume. As a general rule, 1 cubic yard of gravel weighs approximately 1.4 tons (2,800 lbs), though this varies by gravel type. Multiply your cubic yards by the density factor for your chosen material. Always order 5 to 10 percent extra to account for settling, compaction, and uneven ground.
Gravel Types and Coverage
Different gravel types have different densities, appearances, and ideal applications. Use this reference table to choose the right material for your project and estimate weight accurately.
| Gravel Type | Weight per Cubic Yard | Typical Uses |
|---|---|---|
| Pea Gravel | 1.35 tons (2,700 lbs) | Walkways, patios, drainage, playgrounds, between pavers |
| Crushed Stone | 1.40 tons (2,800 lbs) | Driveways, road base, foundation base, retaining walls |
| River Rock | 1.35 tons (2,700 lbs) | Landscaping, garden borders, dry creek beds, erosion control |
| Decomposed Granite | 1.50 tons (3,000 lbs) | Pathways, xeriscaping, patio surfaces, ground cover |
| Crusher Run | 1.50 tons (3,000 lbs) | Road base, driveway base, compacted sub-base, parking areas |
| White Marble Chips | 1.45 tons (2,900 lbs) | Decorative landscaping, flower beds, walkway accents |
Recommended Gravel Depth by Project
The right gravel depth depends on the application. Using too little gravel leads to bare spots and poor drainage, while using too much wastes material and increases costs.
Driveways
4 - 6 inches
Apply in layers: a 4-inch base of larger crushed stone (#3 or #4), topped with 2 inches of finer gravel (#57 or crusher run). For heavy vehicles, increase to 6-8 inches total.
Walkways and Paths
2 - 3 inches
Pea gravel or decomposed granite work best. Install landscape fabric underneath to prevent weed growth and maintain a clean surface over time.
Drainage and French Drains
6 - 12 inches
Use clean, washed stone (#57 or river rock) around perforated pipe. The deeper the trench, the greater the drainage capacity. Minimum 6 inches of gravel surrounding the pipe.
Decorative and Landscaping
2 - 3 inches
Sufficient to provide full ground coverage and suppress weeds. Heavier river rock or marble chips at 2 inches; lighter pea gravel at 2-3 inches for even coverage.
Gravel Cost Estimates
Gravel prices vary by type, region, and quantity. Buying in bulk (by the ton or cubic yard) is significantly cheaper than buying bagged gravel from a hardware store. Delivery fees typically range from $50 to $150 depending on distance and quantity.
| Material | Price per Ton | Price per Cubic Yard |
|---|---|---|
| Pea Gravel | $25 - $50 | $30 - $65 |
| Crushed Stone | $20 - $45 | $25 - $60 |
| River Rock | $40 - $80 | $50 - $100 |
| Decomposed Granite | $30 - $55 | $40 - $75 |
| Crusher Run | $20 - $40 | $25 - $55 |
Prices are approximate U.S. national averages. Actual costs vary by location, supplier, and quantity. Contact local suppliers for current pricing.
Frequently Asked Questions
How much gravel do I need for a driveway?
A standard single-car driveway (10 ft x 40 ft) at 4 inches deep requires approximately 2.2 cubic yards or about 3 tons of gravel. A double-wide driveway (20 ft x 40 ft) at 4 inches deep needs roughly 4.4 cubic yards or about 6 tons. Use our calculator above for exact measurements based on your dimensions.
How much does a ton of gravel cover?
One ton of gravel covers approximately 100 square feet at 2 inches deep, 50 square feet at 4 inches deep, or 33 square feet at 6 inches deep. Coverage varies slightly by gravel type and size, but these estimates work well for planning purposes.
How many cubic yards of gravel are in a ton?
On average, 1 ton of gravel equals approximately 0.71 cubic yards (or conversely, 1 cubic yard equals about 1.4 tons). This ratio varies by material: pea gravel is closer to 0.74 cubic yards per ton, while denser crusher run is closer to 0.67 cubic yards per ton.
Should I order extra gravel?
Yes. Order 5 to 10 percent more than your calculated amount to account for settling, compaction, and ground irregularities. This is especially important for uneven terrain, projects with edges that are hard to contain, or when spreading gravel over soft ground.
What is the best gravel for a driveway?
Crusher run (a mix of crushed stone and stone dust) is the best choice for driveways because it compacts firmly and locks together. Apply a base layer of #3 crushed stone (1-2 inches) followed by a surface layer of crusher run or #57 stone. Avoid using round pea gravel for driveways, as it shifts under tires.