14 by 16 ft slab at 4 inches
Calculate the specifications for a 14 ft by 16 ft residential slab with #4 bars at 18 in spacing. Ensure compliance with IRC R506 standards. Soil design considerations are excluded.
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: 14 by 16 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 requirements for a residential concrete slab measuring 14 ft by 16 ft with a thickness of 4 inches. The design incorporates #4 rebar spaced at 18 inches on center, ensuring structural integrity.
Please note that soil design considerations are excluded from this calculation, and it is essential to consult with a qualified professional for site-specific soil analysis.
Code reference
IRC R506
Field questions
- What is the purpose of using rebar in a concrete slab?
- Rebar is used to enhance the tensile strength of concrete, helping to prevent cracking and structural failure.
- Why is soil design excluded from this calculation?
- Soil design is site-specific and requires a geotechnical analysis to ensure proper load-bearing capacity, which is not covered in this calculator.
- What are the dimensions of the slab mentioned?
- The slab dimensions are 14 feet by 16 feet with a thickness of 4 inches.
- What is the spacing of the rebar in the slab?
- The rebar is spaced at 18 inches on center.