03 · Concrete
Concrete slab calculator
Length × width × thickness, plus 10% waste. Bag counts for 40, 60, and 80 lb mix. If the result is over a cubic yard, a truck is usually the cheaper day.
Common thicknesses
We add 10% waste for spillage and uneven subgrade. Bag yields are Quikrete-style: 80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45, 40 lb ≈ 0.30. A ready-mix truck is usually cheaper above ~1 cubic yard.
| Bag | Count | Buy |
|---|---|---|
| 40 lb | 123 | Home Depot |
| 60 lb | 82 | Home Depot |
| 80 lb | 62 | Home Depot |