Work out how much concrete to order or how many bags to haul home, and how many blocks and bags of mortar a wall takes. Bag yields and mortar coverage come from the manufacturer data sheets linked on each page.
Choose the right concrete or masonry calculator
| Job | Use |
|---|---|
| Slab, patio, footing or driveway (ready-mix truck) | Concrete calculator (cubic yards) |
| Small pour you will mix yourself | Concrete bag calculator (40, 50, 60, 80 and 90 lb bags) |
| Fence and deck posts | Post hole concrete calculator |
| Block wall or foundation | Concrete block calculator |
| Mortar for block or brick | Masonry mortar calculator |
Bags or ready-mix?
As a rule of thumb, under about one cubic yard bags are practical; above that, a ready-mix delivery is usually cheaper and gives a more consistent pour. One cubic yard is 27 cubic feet, which is roughly 45 bags of 80 lb mix, a lot of hand mixing for one person. Our guide on how to order ready-mix concrete covers minimum loads and short-load fees.
Common project sizes
- How many bags of concrete for a 10×10 slab
- How thick a concrete slab should be for patios, sheds and driveways
- How much concrete for fence post holes
- How many concrete blocks for a wall
Add waste before you order
Concrete is ordered once; running short mid-pour leaves a cold joint. Add 5–10% for slabs and footings, and more if the subgrade is uneven. For block walls, add about 5% for cuts and breakage.