Gravel Calculator
Use our gravel calculator to estimate the volume, weight, and cost of gravel needed for your project. Simply enter the area dimensions and depth, and we'll calculate the results for you.
Enter Calculation Parameters
Input Parameters
About Gravel Calculation
What is Gravel?
Gravel is a loose mixture of rock fragments that has typically been formed by erosion through rivers, glaciers, or ocean waves. Commercial gravel is usually screened and graded to meet specific size and quality standards.
Gravel has many uses in building and landscape design, including driveways, walkways, garden decoration, and drainage systems. Different types of gravel have different characteristics and appearances, suitable for various applications.
The benefits of using gravel include cost-effectiveness, ease of installation, excellent drainage properties, and low maintenance requirements. Choosing the right type and size of gravel for your project needs is essential.
How to Use the Gravel Calculator
The gravel calculator helps you estimate the amount of gravel needed for your project. Follow these steps to use the calculator:
- Select area calculation method: Rectangle (length × width), Circle (diameter), or directly enter total area.
- Enter accurate dimensions and select the appropriate units.
- Specify gravel depth, usually 2-4 inches depending on the application.
- Select gravel type for more accurate weight estimation.
- Optional: Enter gravel price to calculate total cost.
Tip: To account for measurement errors and material loss, plan to purchase 10-15% more gravel than the calculated amount.
Gravel Calculation Formulas
Gravel calculations use several basic formulas to determine volume, weight, and cost. Understanding these formulas can help you better understand the calculation process.
Volume Calculation Formula
The gravel volume formula is: Area × Depth. First, all units are converted to a consistent measurement system (typically feet), then the area is multiplied by the depth to get the volume.
Cubic Yards Conversion Formula
Cubic yards is a common unit for gravel volume. Divide cubic feet volume by 27 to get cubic yards: 1 cubic yard = 27 cubic feet.
Circle Area Calculation Formula
For circular areas, the area formula is: π × radius². The radius equals half the diameter.
Weight Calculation Formula
The gravel weight formula is: Volume × Density. Different types of gravel have different densities, typically expressed in pounds per cubic foot.
Unit Conversion Reference
- 1 units.cubicYard = 27 cubic feet
- 1 units.cubicFoot = 0.0370 cubic yards
- 1 units.cubicFoot = 0.0283 cubic meters
- 1 units.cubicMeter = 35.3147 cubic feet
- 1 units.cubicMeter = 1.3080 cubic yards
- 1 ton = 2000 pounds
- 1 ton = 907.185 kilograms
Gravel Types and Uses
There are various types of gravel on the market, each with specific characteristics and best uses. Here are some common types of gravel:
Pea Gravel
Round, smooth stones approximately 1/4-3/8 inch in diameter. Suitable for walkways, playgrounds, and decorative landscapes. Offers good drainage and comfortable walking.
Crushed Stone
Sharp, machine-broken stone pieces of various sizes. Excellent for driveways and roadbeds as they lock together to form a stable surface.
Jersey Shore Gravel
Mixed-size gravel, typically 3/8-3/4 inch. Durable and easy to work with, commonly used for driveways and landscaping.
Marble Chips
Decorative colored gravel made from marble. Primarily used for gardens, water features, and decorative areas. Provides a high-end appearance.
River Rock
Smooth, rounded stones worn by water, varying in size and color. Suitable for decorative landscapes, water features, and garden paths.
Limestone Gravel
Grayish-white crushed limestone, used for driveways, road bases, and drainage systems. Helps regulate soil pH and benefits certain plants.
Lava Rock
Lightweight, porous volcanic rock used for landscaping and garden decoration. Provides excellent drainage, is lightweight and easy to handle.
Gravel Size Classifications
Gravel is typically classified by size into the following categories:
- Fine gravel: 2-8 mm (approx. 0.1-0.3 inches)
- Medium gravel: 8-20 mm (approx. 0.3-0.8 inches)
- Coarse gravel: 20-63 mm (approx. 0.8-2.5 inches)
Gravel Applications
Gravel is a versatile building and landscaping material with many applications:
Driveways and Parking Areas
Gravel is an economical choice for driveways, costing less than asphalt or concrete. Crushed stone or angular gravel is ideal for driveways as they lock together to form a stable surface. Typically requires 3-4 inches of gravel depth.
Landscaping
Gravel can be used for garden paths, flower bed borders, and decorative elements. River rock and colored gravels like marble chips are popular for decorative landscape design. Landscape decoration typically requires 1-2 inches of gravel depth.
Drainage Systems
Gravel is an excellent choice for drainage ditches, rain gardens, and foundation drainage systems. Larger crushed stone (3/4-1.5 inches) is typically used for these applications, providing good water flow channels. Drainage applications typically require 4-8 inches of gravel depth.
Building Foundations
Gravel is a key component for concrete pads and building foundations. It provides a stable base and helps with drainage. Building applications typically require 4-6 inches of compacted gravel layer.
Walkways and Paths
Smooth gravels like pea gravel and river rock are ideal for creating comfortable walking paths. Walkways typically require 2-3 inches of gravel depth, possibly with weed fabric underneath.
Frequently Asked Questions
How much gravel do I need for my driveway?
For standard driveways, a gravel depth of 3-4 inches is recommended. Use our calculator to input your driveway's length and width along with your desired depth for an accurate estimate. Remember to add 10-15% extra for compaction and loss.
How much do different types of gravel cost?
Gravel prices vary depending on type, quality, region, and supplier. Generally, decorative gravels (like marble or colored stones) cost more than standard crushed stone or pea gravel. Buying in bulk usually gets you better pricing.
What preparation work should I do before laying gravel?
Before laying gravel, clear vegetation, level the ground, and consider installing weed fabric to prevent weed growth. For driveways, ensure proper slope for drainage and possibly compact the base layer.
What's the difference between gravel and crushed stone?
While sometimes used interchangeably, strictly speaking, gravel consists of naturally formed rounded rock pieces, while crushed stone refers to mechanically broken rock fragments with sharp angles. Crushed stone, because it locks together, is often used where a stable surface is needed, such as for driveways.
How can I prevent gravel from washing away or spreading over time?
Install edge restraints (like plastic, metal, or stone edging) to keep gravel contained in the desired area. For driveways, consider using stabilized gravel products or surface binders. Regular raking and replenishing are part of routine maintenance for gravel surfaces.