10 by 24 ft slab at 6 inches
Calculate the requirements for a 10 ft by 24 ft residential slab with #4 bars at 18 in spacing. Ensure compliance with IRC R506. Soil design is excluded.
Formula SSC-2026.1
Formula SSC-2026.1 · 4,000 PSI
Order volume
6.19 yd³
4.735 m³ placed+waste
Order weight
25,080 lb
11,376 kg
80 lb bags
279
7 pallets at 42 bags
60 lb bags
372
0.45 ft³ yield each
Rebar
474.00 ft
39 × 20 ft · 39 × 6 m · 348 lb
Ready-mix vs bags
$1,021.78
Truck $1,021.78 · 80 lb bags $1,883.25
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 | 5.63 yd³ | 10% | 6.19 yd³ / 4.735 m³ | USD | $1,021.78 | Source Spec Material / Tool |
| Short-load fee | Full load | — | 1 truck @ 10 yd³ | USD | $0.00 | Source Spec Material / Tool |
| 80 lb pre-mix bags | 253.3 bags | 10% | 279 bags | USD | $1,883.25 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 337.8 bags | 10% | 372 bags | USD | $2,008.80 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 39 sticks | 10% | 43 sticks / 39 × 6 m | USD | $602.00 | Source Spec Material / Tool |
| Rebar chairs | 119 crossings | 10% | 131 chairs | USD | $36.68 | Source Spec Material / Tool |
| Tie wire rolls | 119 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
$1,021.78
0.62 nominal 10 yd³ loads · 1 to order
80 lb bags
$1,883.25
60 lb alternative $2,008.80 · delivery weight 25,080 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 5.00 | 3.821 | 225 | 521 | $824.59 | $1,518.75 |
| 5 in | 5.60 | 4.278 | 252 | 521 | $923.19 | $1,701.00 |
| 6 in | 6.19 | 4.735 | 279 | 521 | $1,021.78 | $1,883.25 |
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 24 ft slab at 6 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 to assist with the design of a residential concrete slab measuring 10 ft by 24 ft and 6 inches in thickness. The slab reinforcement includes #4 rebar spaced at 18 inches on center, in accordance with IRC R506 guidelines.
Please note that soil design considerations are excluded from this calculation. It is essential to assess soil conditions separately to ensure adequate support for the slab.
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 calculation?
- Soil design is a critical factor that varies by location and requires specific analysis. This calculator focuses solely on the slab design per IRC R506.
- What are the dimensions of the slab being calculated?
- The slab dimensions are 10 feet by 24 feet with a thickness of 6 inches.
- How often should the rebar be spaced?
- The rebar should be spaced at 18 inches on center as per the design specifications.
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