16 by 10 ft slab at 4 inches
Calculate the specifications for a residential slab measuring 16 ft by 10 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
2.17 yd³
1.661 m³ placed+waste
Order weight
8,800 lb
3,992 kg
80 lb bags
98
3 pallets at 42 bags
60 lb bags
131
0.45 ft³ yield each
Rebar
222.00 ft
18 × 20 ft · 18 × 6 m · 163 lb
Ready-mix vs bags
$483.52
Truck $483.52 · 80 lb bags $661.50
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 | 1.98 yd³ | 10% | 2.17 yd³ / 1.661 m³ | USD | $358.52 | 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 | 88.9 bags | 10% | 98 bags | USD | $661.50 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 118.5 bags | 10% | 131 bags | USD | $707.40 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 18 sticks | 10% | 20 sticks / 18 × 6 m | USD | $280.00 | Source Spec Material / Tool |
| Rebar chairs | 77 crossings | 10% | 85 chairs | USD | $23.80 | Source Spec Material / Tool |
| Tie wire rolls | 77 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
$483.52
0.22 nominal 10 yd³ loads · 1 to order
80 lb bags
$661.50
60 lb alternative $707.40 · delivery weight 8,800 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 2.17 | 1.661 | 98 | 244 | $483.52 | $661.50 |
| 5 in | 2.72 | 2.077 | 123 | 244 | $573.15 | $830.25 |
| 6 in | 3.26 | 2.492 | 147 | 244 | $662.78 | $992.25 |
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: 16 by 10 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 determining the specifications for a residential concrete slab. The slab dimensions are 16 ft by 10 ft with a thickness of 4 inches, reinforced with #4 bars spaced at 18 inches on center.
Please note that soil design considerations are excluded from this calculation. It is essential to consult local building codes and a licensed professional for site-specific soil conditions and compliance with IRC R506.
Code reference
IRC R506
Field questions
- What is the purpose of using #4 bars in the slab?
- Using #4 bars provides reinforcement to the concrete slab, helping to control cracking and improve structural integrity.
- Why is soil design excluded from this calculator?
- Soil design is highly site-specific and requires a geotechnical analysis. This calculator focuses solely on the concrete slab dimensions and reinforcement.
- What does IRC R506 cover?
- IRC R506 provides guidelines for the design and construction of concrete slabs on grade, including requirements for thickness, reinforcement, and curing.
- Can I use this calculator for commercial slabs?
- This calculator is intended for residential slabs. For commercial applications, it is recommended to consult a licensed engineer for appropriate design and compliance.
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