16 by 14 ft slab at 4 inches
Calculate the requirements for a 16 ft by 14 ft residential slab at 4 in thickness with #4 bars spaced 18 in apart. Ensure compliance with IRC R506 standards. Soil design not included.
Formula SSC-2026.1
Formula SSC-2026.1 · 4,000 PSI
Order volume
3.04 yd³
2.326 m³ placed+waste
Order weight
12,320 lb
5,588 kg
80 lb bags
137
4 pallets at 42 bags
60 lb bags
183
0.45 ft³ yield each
Rebar
314.00 ft
21 × 20 ft · 21 × 6 m · 231 lb
Ready-mix vs bags
$626.93
Truck $626.93 · 80 lb bags $924.75
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 | 2.77 yd³ | 10% | 3.04 yd³ / 2.326 m³ | USD | $501.93 | 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 | 124.4 bags | 10% | 137 bags | USD | $924.75 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 165.9 bags | 10% | 183 bags | USD | $988.20 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 21 sticks | 10% | 24 sticks / 21 × 6 m | USD | $336.00 | Source Spec Material / Tool |
| Rebar chairs | 110 crossings | 10% | 121 chairs | USD | $33.88 | Source Spec Material / Tool |
| Tie wire rolls | 110 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
$626.93
0.30 nominal 10 yd³ loads · 1 to order
80 lb bags
$924.75
60 lb alternative $988.20 · delivery weight 12,320 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 3.04 | 2.326 | 137 | 345 | $626.93 | $924.75 |
| 5 in | 3.80 | 2.907 | 172 | 345 | $752.41 | $1,161.00 |
| 6 in | 4.56 | 3.489 | 206 | 345 | $752.89 | $1,390.50 |
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: 16 by 14 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 assists in determining the specifications for a residential concrete slab measuring 16 ft by 14 ft with a thickness of 4 inches. The design incorporates #4 reinforcement bars spaced 18 inches apart, adhering to the guidelines set forth in the IRC R506.
Please note that soil design considerations are excluded from this calculation and should be addressed separately by a qualified professional.
Code reference
IRC R506
Field questions
- What is IRC R506?
- IRC R506 refers to the International Residential Code section that outlines the requirements for concrete slabs, including design, reinforcement, and construction practices.
- Why is soil design excluded?
- Soil design is excluded because it requires a site-specific analysis and should be performed by a qualified geotechnical engineer to ensure proper load-bearing capacity.
- What does #4 bar mean?
- #4 bar refers to a reinforcing steel bar with a nominal diameter of 1/2 inch, commonly used in concrete reinforcement to enhance tensile strength.
- How thick should a residential slab be?
- For most residential applications, a thickness of 4 inches is standard; however, specific project requirements may vary based on load and soil conditions.