The optimal thickness for a general use concrete sidewalk is four inches. The purpose of your sidewalk is the main determining factor of the thickness you need. Typical sidewalks provide a smooth solid surface for foot traffic and light-weight wheel traffic like bicycles and hand carts.

How thick is a typical sidewalk?

Sidewalks should be at least 4″ (100mm) in thickness. Simple slabs for small foundations, bases, etc., normally 4″ to 6″ (100mm to150mm) thick, depending on the load they must bear. Slope the walk away from buildings to provide proper drainage.

How many inches of concrete do I need for a sidewalk?

Most builders pour a 4-inch thick slab for a sidewalk or walkway, which provides a solid surface to support foot traffic and light-wheeled vehicles such as bicycles or hand carts. Properly cured concrete is hard, durable and water resistant.