Bag & BucketConcrete Calculator: Yards & Bags
Enter the slab's width, length and thickness. You get the volume in cubic yards (how ready-mix is sold) and in 80, 60 and 40 lb pre-mixed bags, with extra for waste.
Frequently asked questions
How thick should a concrete slab be?
4 inches is standard for patios, walkways and shed floors. Driveways and garage floors that carry vehicles are usually 5–6 inches.
How many bags of concrete make a yard?
One cubic yard is 27 cubic feet: about 45 bags of 80 lb, 60 bags of 60 lb or 90 bags of 40 lb pre-mixed concrete.
How much extra concrete should I order?
Order 5–10% more than the exact volume. Ground is never perfectly flat, forms bow and some is lost when pouring.
Developers: GET /api/concrete-calculator returns JSON.