Question: what is the average cost of concrete per square foot?
Answer: Concrete Slab Cost. Concrete slabs typically cost about $6 per square foot, or between $4 and $8 per square foot including labor. That's about $5,400, or between $3,600 and $7,200 for a typical 30- by 30-foot slab that's 6 inches deep. Materials alone cost about $4 per cubic foot.