Calculate exact concrete yardage (cubic yards & cubic feet), 80-lb / 60-lb / 40-lb Quikrete bag counts, rebar grid footage, and Ready-Mix truck vs. bagged concrete cost.
| Material / Application | Standard Spec / Depth | Coverage / Weight | Field Note |
|---|---|---|---|
| 80-lb Concrete Bag (36,3 kg) | 0.60 cu ft (17,0 L) | 45 bags per cubic yard | 1.8 sq ft @ 4" slab depth |
| 60-lb Concrete Bag (27,2 kg) | 0.45 cu ft (12,7 L) | 60 bags per cubic yard | 1.35 sq ft @ 4" slab depth |
| 40-lb Concrete Bag (18,1 kg) | 0.30 cu ft (8,5 L) | 90 bags per cubic yard | 0.90 sq ft @ 4" slab depth |
| 1 Cubic Yard Ready-Mix (0,765 m³) | 27.0 cu ft (765 L) | 1 yd³ (approx. 4,000 lbs) | 81 sq ft @ 4" · 54 sq ft @ 6" |
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One 80-lb bag of pre-mixed concrete yields approximately 0.60 cubic feet. Since 1 cubic yard is 27 cubic feet, you need exactly 45 bags of 80-lb concrete (or 60 bags of 60-lb concrete, or 90 bags of 40-lb concrete) per cubic yard.
At 4 inches thick (including 10% spillage reserve): a 10×10 ft slab needs 1.36 cubic yards (62 × 80-lb bags); a 12×12 ft slab needs 1.96 cubic yards (88 × 80-lb bags); and a 20×20 ft slab needs 5.43 cubic yards (order 5.5 yards from a ready-mix truck).
Even when paying a $120–$150 short-load fee for small deliveries, a ready-mix truck becomes cheaper than buying 80-lb bags at around 1.8 to 2.2 cubic yards (80 to 100 bags) — while delivering a monolithic pour with uniform strength.