Pre-Calculated Specs for a 12×10 Concrete Slab (4" Depth)
standard outdoor garden shed, workshop floor, or rectangular covered patio80 lb Bags Needed74 bagsincl. 10% waste
Total Volume1.63 yd³44 cu ft
Sub-Base Gravel1.7 yd³~92 bags (50 lb)
#4 Rebar Needed~184 ft18" on-center grid
Expert Contractor Recommendation: Mid-size project (74 bags / 1.63 yd³). Can be hand-mixed on site with a rented electric drum mixer or delivered via a short-load concrete truck.
Engineering Considerations for 12×10 Pours
A 12×10 slab covers exactly 120 square feet. This size is commonly used for a standard outdoor garden shed, workshop floor, or rectangular covered patio. At 1.63 cubic yards, this is an approachable DIY project that can be completed over a single weekend with a rented mechanical drum mixer.
| Bag Size | Total Bags Needed | Combined Dry Weight | Estimated Material Cost |
|---|---|---|---|
| 80 lb bag | 74 bags | 5,920 lbs (2,685 kg) | $429 - $555 |
| 60 lb bag | 98 bags | 5,880 lbs (2,667 kg) | $480 - $627 |
| 50 lb bag | 118 bags | 5,900 lbs (2,676 kg) | $502 - $649 |
| 40 lb bag | 147 bags | 5,880 lbs (2,667 kg) | $529 - $706 |