Concrete guide

Thickness intent

Concrete thickness guide

Concrete thickness should match the job: slab, footing, or small structural fill. This guide keeps the recommendation tied to the actual pour type.

Use this for

  • Slab depth checks
  • Footing depth checks
  • Small pour planning
Common ranges

Practical thickness ranges

Shed bases and patios

Thin slabs are usually enough when the slab is lightly loaded and the subbase is stable.

Garage slabs

Garage floors usually need a bit more thickness than a small patio because the loads are higher.

Footings

Footings are governed by width and depth rather than thin slab behavior.

Related pages

Concrete pages

Concrete volume calculator

Open the main calculator for exact dimensions.

Open calculator

Concrete slab volume calculator

Go to the slab page for patios and floors.

Open page

How much concrete for a garage floor

Use the garage floor page for a larger slab example.

Open page