Enter slab dimensions and bag yield to estimate how many bags of concrete mix you need for post holes, small pads, and patch jobs.
Enter your project dimensions and click Calculate to see your estimate.
Typical materials for a bagged concrete project
Bag counts assume standard yield per bag. Check the label on your specific product.
Bag count is calculated from slab volume divided by per-bag yield. Waste covers spillage, uneven pours, and partial bag use.
Results are planning estimates based on typical assumptions. Verify quantities with product labels and your project layout before purchase. How we calculate
A 10×10 slab at 4 inches thick is about 33 cubic feet (roughly 1.2 cubic yards) before waste. With a bag yield of 0.45 cubic feet, you need about 74 bags before waste. Enter your dimensions and bag yield in the calculator.
Enter the cubic feet yield printed on your bag label. A common default is about 0.45 cubic feet per bag, but yields vary by brand and mix type — check your product packaging.
Bagged mix suits post holes, small pads, and repairs under roughly one cubic yard. Larger pours are usually cheaper and faster with ready-mix delivery by the truck.
Add 10% for spillage, uneven pours, and partial bag use. Running short mid-pour is difficult to fix, so a small overage is worthwhile on small projects.
Divide total cubic feet (with waste) by the cubic feet each bag yields. The calculator performs this conversion and rounds up to whole bags.
No. This tool estimates bagged concrete volume only. Rebar, wire mesh, and compacted base materials are ordered separately.
