Gravel comes in many sizes, each perfect for different jobs, like landscaping or building. By understanding these sizes, you can pick the right gravel for your project. Balancing factors like drainage and load-bearing capacity is crucial. Choosing the wrong size can impact your project’s success, so consider each option carefully.
Gravel Size Chart
Gravel and crushed stone size chart
| Gravel number | Size in inches | Size in mm |
| #1 | 2 – 4 inches | 50.0 -102 mm |
| #2 | 0.5 – 2.5 inches | 13.0 – 63.5 mm |
| #3 | 0.5 – 2.0 inches | 13.0 – 50.0 mm |
| #4 | 1.0 – 2.5 inches | 25.0 – 63.5 mm |
| #5: | 1.0 inch | 25.0 mm |
| #8: | 0.4 – 0.5 inches | 10.0 – 13.0 mm |
| #10 | 0.1 inches | 3.0 mm |
| #57 | 0.8 inches | 20.0 mm |
| #67 | less than 0.8 inches | Less than 20.0 mm |
Most common used gravel compared in a table
| Type of Gravel | Characteristics | Best Uses | Edging Required? |
|---|---|---|---|
| Pea Gravel | Small, rounded stones in natural colors | Walkways, driveways’ top layer | Yes |
| River Rock | Smooth and rounded gravel in natural shades | Landscaping, top layer of driveways | Yes |
| Lava Rock | Porous structure, comes in red, black, or gray | Weed control, mulch, and aesthetic landscaping | No |
| Marble Chips | Chipped marble in white and gray | Walkways, driveways’ top layer | Yes |
| Jersey Shore Gravel | Small, smooth gravel in golden color | Driveways, walks, landscaping in specific regions | Yes |
Understanding Gravel Sizes
Gravel size is usually classified by the diameter of each stone, which helps determine how suitable it is for various uses. For example, smaller gravel works well for decorative purposes and pathways, while larger gravel is better for driveways and drainage.
Balancing these factors can be challenging, as using the wrong size can affect durability and appearance. Thus, carefully considering the impact of your gravel choice is essential to achieving the best results for your project.
Types of Gravel and Their Sizes
Pea Gravel
Pea gravel features small, round stones that range from 1/8 to 3/8 inches in diameter. This size makes it ideal for pathways and decorative uses. While its smooth texture adds aesthetic appeal, it may not provide the same stability as larger gravel types. Therefore, carefully consider its impact on your project’s function and appearance.
Crushed Stone
Crushed stone comes in various sizes, such as 3/4-inch and 1 1/2-inch, and is made by breaking larger rocks into smaller, angular pieces. This type is excellent for driveways and base layers due to its durability and strength. However, its angular shape can be less comfortable underfoot compared to smoother stones. Weighing these trade-offs is crucial for ensuring the right choice for your needs.
River Rock
River rock is known for its smooth, rounded stones, usually ranging from 1 to 3 inches in diameter. It is often used in landscaping and erosion control. Its smooth surface is aesthetically pleasing and effective for drainage, but it may shift more easily under heavy traffic or impact. Consider these factors to balance beauty and functionality in your project.
Sand and Gravel Mix
A sand and gravel mix combines fine sand with gravel of various sizes, making it ideal for concrete production and creating a stable base for other materials. While this mix provides versatility and strength, it might require more maintenance to prevent settling over time. Evaluating the impact of this mix on your project’s durability and stability is essential.
How to Measure Gravel
Accurate measurement of gravel size is crucial for ensuring you get the right type for your project. You can achieve this using tools such as a gravel gauge or by referring to the size chart provided by suppliers. While a gravel gauge offers precise measurements on-site, it may not always be readily available.
On the other hand, size charts from suppliers can provide a quick reference but might lack detail. Balancing these approaches involves considering the trade-offs between precision and convenience. Ensuring the right gravel size impacts both the effectiveness and appearance of your project, making accurate measurement essential.
FAQ
1. What is the difference between pea gravel and crushed stone?
Pea gravel consists of small, round stones ranging from 1/8 to 3/8 inches in diameter, ideal for decorative purposes and pathways. In contrast, crushed stone is made by crushing larger rocks into angular pieces of various sizes, such as 3/4-inch and 1 1/2-inch. Crushed stone is more suitable for driveways and base layers due to its strength and stability. The main difference lies in their shapes and applications: pea gravel is smoother and more visually appealing, while crushed stone provides better structural support.
2. How can I determine the right gravel size for my project?
To determine the right gravel size, first consider the purpose of the gravel. For pathways and decorative uses, smaller gravel like pea gravel works well. For driveways and structural support, larger crushed stone is more appropriate. Use a gravel gauge for on-site measurements or consult the size chart from suppliers to ensure you select the correct type. Balancing factors such as drainage needs, load-bearing capacity, and aesthetic preferences will help you make the best choice.
3. What are the challenges of using river rock for erosion control?
River rock is effective for erosion control due to its smooth, rounded stones that aid in drainage. However, its smooth surface can make it prone to shifting under heavy traffic or impact, potentially reducing its effectiveness. Additionally, river rock can be more expensive and require more maintenance compared to other types of gravel. Weighing these challenges against its benefits, such as improved aesthetics and drainage, will help you decide if river rock is suitable for your project.