10 by 16 ft slab at 5 inches
Calculate the specifications for a residential slab measuring 10 ft by 16 ft at 5 in thick, reinforced 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
2.72 yd³
2.077 m³ placed+waste
Order weight
11,000 lb
4,990 kg
80 lb bags
123
3 pallets at 42 bags
60 lb bags
163
0.45 ft³ yield each
Rebar
222.00 ft
18 × 20 ft · 18 × 6 m · 163 lb
Ready-mix vs bags
$573.15
Truck $573.15 · 80 lb bags $830.25
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 | 2.47 yd³ | 10% | 2.72 yd³ / 2.077 m³ | USD | $448.15 | 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 | 111.1 bags | 10% | 123 bags | USD | $830.25 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 148.1 bags | 10% | 163 bags | USD | $880.20 | 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
$573.15
0.27 nominal 10 yd³ loads · 1 to order
80 lb bags
$830.25
60 lb alternative $880.20 · delivery weight 11,000 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: 10 by 16 ft slab at 5 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 10 ft by 16 ft and 5 inches thick, reinforced with #4 rebar at 18-inch intervals. Please note that soil design considerations are excluded from this calculation.
For compliance with the International Residential Code (IRC) R506, ensure that all materials and construction practices meet the required standards for durability and safety.
Code reference
IRC R506
Field questions
- What is the purpose of using #4 bars in the slab?
- Using #4 bars helps to reinforce the concrete slab, providing additional strength and preventing cracking due to tension forces.
- Why is soil design excluded from this calculation?
- Soil design is excluded because it requires specific site analysis and testing to determine the appropriate foundation and slab thickness based on soil conditions.
- What are the dimensions of the slab?
- The slab dimensions are 10 feet by 16 feet with a thickness of 5 inches.
- What spacing is recommended for the rebar?
- The recommended spacing for the #4 bars in this slab design is 18 inches on center.
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