How Much Concrete for a 40×60 Slab?
Quick Answer
A 40×60 foot slab poured 4 inches thick needs 29.6 cubic yards of concrete. Order about 33 cubic yards to cover a 10% waste factor. A pour this size almost always uses a 6-inch thickness for shops and pole barns, which needs about 44 cubic yards.
- 4-inch slab: 29.6 cubic yards (800 cubic feet)
- 6-inch slab (typical for shops): 44.4 cubic yards
- Order ~33 cubic yards at 4 inches with 10% waste
- Ready-mix cost: $4,445–$5,185 at 4 inches
Formula
Multiply length, width, and thickness (in feet) to get cubic feet, then divide by 27 for cubic yards. A 40×60 is 2,400 square feet, so thickness drives a large volume difference.
Step-by-Step Calculation
- 1
Slab volume in cubic feet
40 × 60 × 0.333 = 800 cubic feet
- 2
Convert to cubic yards
800 ÷ 27 = 29.6 cubic yards
- 3
Add 10% waste
29.6 × 1.10 = 32.6 → order ~33 cubic yards
- 4
At 6 inches instead
2,400 × 0.5 ÷ 27 = 44.4 cubic yards
40×60 Slab Concrete by Thickness
| Thickness | Cubic Feet | Cubic Yards | With 10% Waste | Ready-Mix Cost* |
|---|---|---|---|---|
| 4 inches | 800 | 29.6 | 32.6 | $4,445–$5,185 |
| 5 inches | 1,000 | 37.0 | 40.7 | $5,556–$6,481 |
| 6 inches | 1,200 | 44.4 | 48.9 | $6,666–$7,777 |
*Ready-mix at $150–$175 per cubic yard. Large pours often qualify for volume pricing but may need multiple truck loads scheduled back to back.
Frequently Asked Questions
How many concrete trucks for a 40×60 slab?
A full mixer holds about 10 cubic yards. A 4-inch 40×60 slab (33 cubic yards with waste) needs about 4 truck loads; a 6-inch slab needs about 5. Coordinate delivery timing so the pour stays continuous.
How thick should a 40×60 shop slab be?
Six inches is standard for shops, pole barns, and equipment storage. Add rebar or wire mesh reinforcement and thickened edges (8 to 12 inches) where walls or heavy loads bear down.
How much does a 40×60 concrete slab cost?
Materials alone run $4,400–$7,800 by thickness. A finished 40×60 slab poured by a contractor typically costs $14,400–$28,800 (about $6–$12 per sq ft) including labor, base prep, and reinforcement.