10 by 10 ft slab at 4 inches
Calculate the specifications for a 10 ft by 10 ft residential slab at 4 inches thick, reinforced with #4 bars at 18 inches. Excludes soil design considerations as per IRC R506.
Formula SSC-2026.1
Formula SSC-2026.1 · 4,000 PSI
Order volume
1.36 yd³
1.038 m³ placed+waste
Order weight
5,500 lb
2,495 kg
80 lb bags
62
2 pallets at 42 bags
60 lb bags
82
0.45 ft³ yield each
Rebar
140.00 ft
14 × 20 ft · 14 × 6 m · 103 lb
Ready-mix vs bags
$349.07
Truck $349.07 · 80 lb bags $418.50
Grid lines are equalized so the drawing stays readable. The order count uses on-center spacing with a bar at each end of the layout, then holds concrete cover in the field.
| Item | Net | Waste | Order | Unit price | Line total | Source Spec Material / Tool |
|---|---|---|---|---|---|---|
| Ready-mix concrete | 1.23 yd³ | 10% | 1.36 yd³ / 1.038 m³ | USD | $224.07 | Source Spec Material / Tool |
| Short-load fee | Under 4 yd³ | — | 1 truck @ 10 yd³ | USD | $125.00 | Source Spec Material / Tool |
| 80 lb pre-mix bags | 55.6 bags | 10% | 62 bags | USD | $418.50 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 74.1 bags | 10% | 82 bags | USD | $442.80 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 14 sticks | 10% | 16 sticks / 14 × 6 m | USD | $224.00 | Source Spec Material / Tool |
| Rebar chairs | 49 crossings | 10% | 54 chairs | USD | $15.12 | Source Spec Material / Tool |
| Tie wire rolls | 49 ties | 10% | 1 rolls | USD | $8.00 | Source Spec Material / Tool |
Source links open a product search on the Amazon storefront for the selected currency. SiteSpecCalc may earn a commission. The link does not change the quantities above.
Ready-mix truck
$349.07
0.14 nominal 10 yd³ loads · 1 to order
80 lb bags
$418.50
60 lb alternative $442.80 · delivery weight 5,500 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 1.36 | 1.038 | 62 | 154 | $349.07 | $418.50 |
| 5 in | 1.70 | 1.298 | 77 | 154 | $405.09 | $519.75 |
| 6 in | 2.04 | 1.557 | 92 | 154 | $461.11 | $621.00 |
Show the deterministic formula
Slab ft³ = L × W × thickness ÷ 12. Thickened-edge extra = footing band × (footing depth − slab thickness), with corner squares counted once.
yd³ = ft³ ÷ 27. m³ = ft³ × 0.0283168. Weight uses 150 lb/ft³, then the header converts that pound total at 1 lb = 0.45359237 kg. 80 lb bags yield 0.6 ft³ and 60 lb bags yield 0.45 ft³. Currency changes the price labels only.
Bars across a span = floor(span ÷ spacing) + 1. Order sticks = that count, plus 10, 5, or 15 percent waste, cut from 20 ft and 6 m stock. Chairs = one per grid intersection.
Contractor sign-off
Project: 10 by 10 ft slab at 4 inches
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This sheet is an estimate for ordering and layout discussion. It is not a sealed design. Confirm the quantities with a licensed local professional and the authority having jurisdiction before you buy or build.
Engineering notes
This calculator is designed for a residential slab measuring 10 ft by 10 ft with a thickness of 4 inches. It incorporates #4 rebar spaced at 18 inches on center, adhering to the guidelines set forth in the International Residential Code (IRC) R506 for concrete slabs.
Please note that soil design considerations are excluded from this calculation. It is essential to consult a qualified engineer for soil analysis before proceeding with construction.
Code reference
IRC R506
Field questions
- What is the purpose of using #4 bars in the slab?
- The #4 bars provide reinforcement to the concrete slab, helping to control cracking and improve structural integrity.
- Why is soil design excluded from this calculator?
- Soil design is a complex aspect that requires site-specific analysis and should be conducted by a qualified engineer to ensure safety and compliance.
- What does IRC R506 cover?
- IRC R506 provides guidelines for the design and construction of concrete slabs on grade, including requirements for reinforcement, thickness, and installation.
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