How many bags of Quikrete for a 10×10 slab?
Quick Answer
A 10×10 foot slab poured 4 inches thick requires 1.23 cubic yards — approximately 56 bags of 80-lb Quikrete concrete mix (each yields 0.022 yd³). At 6-inch thickness: 84 bags. For any slab this size, a ready-mix truck is significantly cheaper ($175–220 delivered vs $390–500 in Quikrete bags).
Quick Reference Table
| 10×10 slab depth | 80-lb Quikrete bags needed |
|---|---|
| 3 inches | 42 bags (0.93 yd³) |
| 4 inches | 56 bags (1.23 yd³) |
| 5 inches | 69 bags (1.54 yd³) |
| 6 inches | 84 bags (1.85 yd³) |
How to Calculate It Yourself
- 1
Volume: 10 × 10 × (4/12) = 33.3 cu ft ÷ 27 = 1.23 yd³.
- 2
Add 10% waste: 1.23 × 1.10 = 1.35 yd³.
- 3
Bags: 1.35 ÷ 0.022 (yd³ per 80-lb bag) = 61 bags. Round up to 62.
- 4
Compare: 62 bags × $7.50 = $465 in bags. Ready-mix: ~$200 delivered. Save $265 and several hours of mixing.
Pro Tip
If you do use bags, rent a electric concrete mixer ($40/day) instead of mixing by hand. Hand-mixing 56 bags is exhausting and produces inconsistent results. A mixer handles 2 bags at once and keeps concrete workable throughout the pour.
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