A standard gravel size chart usually includes sizes like pea gravel (3/8 inch), river rock (1/2 inch to 1 inch), crushed stone (1 inch to 2 inches), and larger sizes such as boulders or cobbles.

Although gravel can come in a variety of sizes, pea gravel is typically 3/8”. It is often softer to the touch too, thanks to its rounded and smooth sides. Plus, pea gravel comes in a variety of different colors, including neutral colors like brown and gray, as well as more eye-catching colors like red and blue.