Pre-Calculated Specs for a 10×10 Concrete Slab (4" Depth)
standard backyard patio, hot tub base, or garden pergola foundation80 lb Bags Needed62 bagsincl. 10% waste
Total Volume1.36 yd³36.7 cu ft
Sub-Base Gravel1.42 yd³~77 bags (50 lb)
#4 Rebar Needed~157 ft18" on-center grid
Expert Contractor Recommendation: Mid-size project (62 bags / 1.36 yd³). Can be hand-mixed on site with a rented electric drum mixer or delivered via a short-load concrete truck.
Engineering Considerations for 10×10 Pours
A 10×10 slab covers exactly 100 square feet. This size is commonly used for a standard backyard patio, hot tub base, or garden pergola foundation. At 1.36 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 | 62 bags | 4,960 lbs (2,250 kg) | $360 - $465 |
| 60 lb bag | 82 bags | 4,920 lbs (2,232 kg) | $402 - $525 |
| 50 lb bag | 98 bags | 4,900 lbs (2,223 kg) | $417 - $539 |
| 40 lb bag | 123 bags | 4,920 lbs (2,232 kg) | $443 - $590 |