Concrete Calculator

Estimate concrete for slabs, footings, and columns in cubic feet and cubic yards. Enter your dimensions to instantly see how many bags you'll need (40lb, 60lb, or 80lb) plus total cost. A waste factor is applied automatically so you don't come up short on pour day.

Main Concrete Calculator

Shape

Length (ft)

Width (ft or in)

Depth / Thickness

Waste factor (%)

Price per cubic yard ($)

Results

Cubic feet—

Cubic yards—

40 lb bags needed—

60 lb bags needed—

80 lb bags needed—

Estimated cost (ready-mix)—

Quick Bag Calculator (Small Pours)

For small pours like post holes or a single fence footing, enter cubic feet to see how many bags to grab at the store.

Cubic feet needed

Bag size

Bags to Buy

Bags needed (with 10% extra)—

Tip: Always order 5–10% extra ready-mix to account for spillage, sub-grade irregularities, and over-excavation.