Skip to main content
Home Crane
Search

Concrete Calculator

Concrete is ordered by volume, and thickness is measured in inches while length and width are in feet. This calculator handles the conversion and adds a waste allowance for uneven ground and spillage.

Your result appears here after you press Calculate.

How it is calculated

  • Volume in cubic feet = length × width × (thickness ÷ 12).
  • Cubic yards = cubic feet ÷ 27.
  • Order volume = volume × (1 + waste).
  • Bags = order cubic feet ÷ yield per bag, rounded up.

Assumptions and limits

  • A yield near 0.6 cubic feet per 80 lb bag is typical, but read your bag.
  • Slab thickness, reinforcement and base depend on the use and local code. Confirm with a professional.

Material estimates are for planning and ordering guidance. Coverage, yield and dimensions vary by product, so check the manufacturer's labeling. Structural work, roofing at height and code compliance should be handled by qualified professionals and confirmed with your local building department.

More calculators