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.
Assumptions to Check
Before ordering materials, confirm the dimensions, product coverage, waste factor, and local installation requirements for your project. Manufacturer coverage tables and local code rules can change the final quantity, especially for structural work, exterior projects, and irregular layouts.
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