10 by 10 ft slab at 5 inches
Calculate the requirements for a 10 ft x 10 ft residential slab at 5 in thickness with #4 bars spaced at 18 in. Refer to IRC R506 for guidelines. Soil design is excluded.
Formula SSC-2026.1
Formula SSC-2026.1 · 4,000 PSI
Order volume
1.70 yd³
1.298 m³ placed+waste
Order weight
6,875 lb
3,118 kg
80 lb bags
77
2 pallets at 42 bags
60 lb bags
102
0.45 ft³ yield each
Rebar
140.00 ft
14 × 20 ft · 14 × 6 m · 103 lb
Ready-mix vs bags
$405.09
Truck $405.09 · 80 lb bags $519.75
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 | 1.54 yd³ | 10% | 1.70 yd³ / 1.298 m³ | USD | $280.09 | 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 | 69.4 bags | 10% | 77 bags | USD | $519.75 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 92.6 bags | 10% | 102 bags | USD | $550.80 | 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
$405.09
0.17 nominal 10 yd³ loads · 1 to order
80 lb bags
$519.75
60 lb alternative $550.80 · delivery weight 6,875 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 5 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 assists in determining the specifications for a residential slab measuring 10 ft by 10 ft with a thickness of 5 inches. Reinforcement is provided using #4 bars placed at 18-inch intervals.
It is important to note that soil design considerations are excluded from this calculation. For compliance with local building codes, refer to IRC R506 for guidelines on slab construction.
Code reference
IRC R506
Field questions
- What is the purpose of using #4 bars in the slab?
- Using #4 bars helps to reinforce the concrete slab, providing additional strength and reducing the risk of cracking.
- Why is soil design excluded from this calculation?
- Soil design is site-specific and requires a geotechnical analysis to ensure proper load-bearing capacity and stability, which is beyond the scope of this calculator.
- What thickness is recommended for a residential slab?
- A thickness of 5 inches is commonly recommended for residential slabs, but it may vary based on specific load requirements and local building codes.