How much do you actually need?
Enter your dimensions, get the quantity — in the units the supplier sells it in, with waste accounted for and bag counts rounded up. 19 calculators so far, each one checked against the published yield figures rather than a rule of thumb.
Straight to an answer
- How many blocks for a 10x10 wall?
- How many blocks for a 20 ft wall 8 ft high?
- How many concrete blocks per square foot?
- How many bags of mortar per 100 blocks?
- How much concrete for a deck footing?
- How much concrete for a 20 ft footing?
- How many bags of concrete for a 4x4 fence post?
- How many bags of concrete for a 6x6 post?
Concrete & Masonry
Slabs, footings, blocks, mortar and grout.
Landscaping
Mulch, soil, gravel, sand, sod and edging.
Interior
Paint, drywall, flooring, tile and trim.
Exterior
Roofing, siding, decking, fencing and insulation.
Why the numbers here are different
Most material calculators quietly skip the parts that cost you money. They leave out the waste allowance, or they round bag counts down, or they use a coverage figure that no manufacturer actually prints. Each calculator here names the yield figure it uses and where it comes from, so you can check it against the bag in your hand.