14 by 8 ft slab at 4 inches
Calculate the requirements for a residential slab measuring 14 ft by 8 ft at 4 in thickness with #4 bars at 18 in spacing. Ensure compliance with IRC R506 standards.
Formula SSC-2026.1
Formula SSC-2026.1 · 4,000 PSI
Order volume
1.52 yd³
1.163 m³ placed+waste
Order weight
6,160 lb
2,794 kg
80 lb bags
69
2 pallets at 42 bags
60 lb bags
92
0.45 ft³ yield each
Rebar
164.00 ft
16 × 20 ft · 16 × 6 m · 121 lb
Ready-mix vs bags
$375.96
Truck $375.96 · 80 lb bags $465.75
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 | 1.38 yd³ | 10% | 1.52 yd³ / 1.163 m³ | USD | $250.96 | 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 | 62.2 bags | 10% | 69 bags | USD | $465.75 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 83.0 bags | 10% | 92 bags | USD | $496.80 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 16 sticks | 10% | 18 sticks / 16 × 6 m | USD | $252.00 | Source Spec Material / Tool |
| Rebar chairs | 60 crossings | 10% | 66 chairs | USD | $18.48 | Source Spec Material / Tool |
| Tie wire rolls | 60 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
$375.96
0.15 nominal 10 yd³ loads · 1 to order
80 lb bags
$465.75
60 lb alternative $496.80 · delivery weight 6,160 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 1.52 | 1.163 | 69 | 180 | $375.96 | $465.75 |
| 5 in | 1.90 | 1.454 | 86 | 180 | $438.70 | $580.50 |
| 6 in | 2.28 | 1.744 | 103 | 180 | $501.44 | $695.25 |
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: 14 by 8 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 to assist in the design of a residential slab measuring 14 ft by 8 ft and 4 inches thick, incorporating #4 rebar spaced at 18 inches. Please note that soil design considerations are excluded from this calculation.
For compliance, refer to the International Residential Code (IRC) Section R506, which outlines the requirements for concrete floor slabs.
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 separate consideration that depends on the specific site conditions and soil type, which are not addressed in this calculator.
- What thickness is recommended for residential slabs?
- The recommended thickness for residential slabs is typically 4 inches, as used in this design.
- How do I ensure my slab complies with IRC R506?
- To ensure compliance, follow the guidelines outlined in IRC R506 regarding materials, reinforcement, and construction practices.
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