How many bags of concrete are in a cubic yard?

A cubic yard is 27 cubic feet. With 80 lb bags (≈0.6 ft³ each) you need about 45 bags; with 60 lb bags (≈0.45 ft³) about 60 bags.

How thick should a concrete slab be?

4 inches is standard for patios and walkways. Use 5–6 inches for driveways or anywhere vehicles will park.

Should I order extra concrete?

Yes. Add 5–10% for spillage, uneven subgrade, and over-excavation. Running short mid-pour creates a cold joint.

Concrete Cost in Illinois

Local 2026 pricing for Illinois

Concrete costs in Illinois run roughly 5% above the national average. Illinois freeze-thaw winters require air-entrained concrete and footings below the frost line, with labor slightly above the national average.

Your measurements

Length(ft)

Width(ft)

Thickness(in)

Waste allowance

Accounts for spillage and uneven subgrade.

Price per unit($/yd³)

Override the default ready-mix price range.

Enter your measurements

Fill in the fields to see your estimate.

Why Illinois prices differ

Illinois freeze-thaw winters require air-entrained concrete and footings below the frost line, with labor slightly above the national average.

Project size — larger concrete jobs lower the cost per unit but raise the total.
Material grade — premium products cost more but often last longer.
Labor rates — local wages and demand swing installed prices significantly.
Region — prices vary by state and metro (see local cost pages below).

Estimates are guidance only — get quotes from local concrete pros in Illinois. See the national cost breakdown →