How much concrete do I need for a 8×8 shed slab?
≈ 0.79 cubic yards
That’s about 36 bags of 80-lb concrete mix (or 48 60-lb bags) for a 8×8 area at 4″ thick.
A 8 ft × 8 ft shed slab is 64 square feet. Poured at the standard 4-inch slab thickness, that’s 21.3 cubic feet of concrete — about 0.79 cubic yards.
| Area | 64 sq ft |
| Thickness | 4 in |
| Volume | 0.79 cu yd (21.3 cu ft) |
| 80-lb bags | 36 bags |
| 60-lb bags | 48 bags |
Tip: buy ~10% extra for spillage and uneven subgrade. For a thicker pour (driveways are often 5–6″), use the calculator to adjust.
Change the size → open the concrete calculatorGrab the supplies
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