Gravel Calculator
Part of Materials Calculators
Calculate tons and cubic yards of gravel needed for driveways, pathways, and landscaping projects. Get instant material and cost estimates.
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How to Use the Gravel Calculator
This gravel calculator helps you determine the exact amount of gravel needed for your outdoor project. Simply select your gravel type, choose the area shape (rectangular or circular), enter the dimensions and desired depth, and get instant calculations for tons, cubic yards, and estimated cost. Perfect for driveways, pathways, garden beds, and landscaping projects.
Understanding Gravel Measurements
Gravel is sold by weight (tons) or volume (cubic yards). One cubic yard equals 27 cubic feet. The weight of a cubic yard varies by material type: crushed stone typically weighs 2,700 pounds per cubic yard, pea gravel about 2,500 pounds, and lightweight materials like lava rock around 2,400 pounds. Knowing the density of your chosen material ensures accurate weight calculations for ordering and delivery.
Choosing the Right Gravel Type
Crushed Stone: Angular rock fragments ideal for driveways and pathways because they compact well and resist shifting. Available in various sizes from fine dust to 2-inch rocks. The most popular size for driveways is 3/4-inch crushed stone, which provides excellent stability and drainage.
Pea Gravel: Smooth, rounded stones about the size of a pea. Comfortable to walk on barefoot and commonly used for pathways, playgrounds, and decorative landscaping. Pea gravel doesn't compact as firmly as crushed stone, so it's less suitable for driveways but excellent for areas where aesthetics matter.
River Rock: Larger, smooth stones that add visual appeal to landscaping. Often used for dry creek beds, borders, and decorative accents. Available in sizes from 1 inch to 6 inches or larger. River rock is primarily decorative and doesn't provide the structural stability of crushed stone.
Recommended Depths for Different Applications
Driveways: For a stable driveway, apply 4 to 6 inches of gravel. Use larger crushed stone (3/4-inch to 1-inch) as a base layer and smaller gravel or stone dust as the top layer. Compact each layer thoroughly for maximum stability and longevity.
Pathways: Garden paths typically need 2 to 4 inches of gravel. Use pea gravel or small crushed stone for comfortable walking surfaces. Consider edging to contain the gravel and prevent spreading.
Landscaping Beds: Apply 2 to 3 inches of decorative gravel or river rock for weed suppression and moisture retention. Install landscape fabric underneath to further prevent weed growth and keep soil separate from the gravel.
Drainage Systems: French drains and other drainage applications require 3 to 5 inches of clean, washed stone with no fines (dust or small particles). Use 3/4-inch to 1.5-inch stone for optimal water flow.
Calculating Gravel for Your Project
To calculate gravel volume, multiply length by width by depth for rectangular areas. For circular areas, use the formula: π × radius² × depth. Convert depth from inches to feet by dividing by 12. Multiply the cubic feet by the gravel density to get the weight in pounds, then divide by 2,000 to convert to tons. This calculator performs these conversions automatically for accurate results.
Gravel Pricing and Delivery
Gravel prices vary by location, material type, and quantity. Bulk gravel typically costs between $15 and $75 per ton, with decorative options at the higher end. Many suppliers offer volume discounts for large orders. Delivery fees depend on distance and load size, often ranging from $50 to $150. Some suppliers include free delivery for orders above a minimum quantity, typically 5 to 10 tons.
Site Preparation Tips
Before ordering gravel, prepare your site properly. Remove grass, weeds, and debris. Grade the area to ensure proper drainage away from buildings. Compact the soil to create a stable base. Install landscape fabric to prevent weed growth and separation between soil and gravel. Add edging or borders to contain the gravel and maintain clean lines. Proper preparation ensures your gravel stays in place and performs its intended function for years.
Maintenance and Longevity
Gravel surfaces require periodic maintenance. Rake regularly to redistribute material and maintain a level surface. Add fresh gravel every few years to compensate for settling and displacement. Control weeds by applying pre-emergent herbicide or adding more landscape fabric. For driveways, compact gravel annually and fill low spots to prevent rutting. Well-maintained gravel surfaces can last decades with minimal expense compared to asphalt or concrete.
Related Calculations
For landscaping projects, you may also need the Mulch Calculator for garden beds, the Topsoil Calculator for planting areas, or the Sand Calculator for paver base layers.