10 by 16 ft slab at 6 inches
Calculate the requirements for a 10 ft by 16 ft residential slab at 6 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
4.24 yd³
3.239 m³ placed+waste
Order weight
17,160 lb
7,784 kg
80 lb bags
191
5 pallets at 42 bags
60 lb bags
255
0.45 ft³ yield each
Rebar
326.00 ft
24 × 20 ft · 24 × 6 m · 240 lb
Ready-mix vs bags
$699.11
Truck $699.11 · 80 lb bags $1,289.25
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 | 3.85 yd³ | 10% | 4.24 yd³ / 3.239 m³ | USD | $699.11 | Source Spec Material / Tool |
| Short-load fee | Full load | — | 1 truck @ 10 yd³ | USD | $0.00 | Source Spec Material / Tool |
| 80 lb pre-mix bags | 173.3 bags | 10% | 191 bags | USD | $1,289.25 | Source Spec Material / Tool |
| 60 lb pre-mix bags | 231.1 bags | 10% | 255 bags | USD | $1,377.00 | Source Spec Material / Tool |
| #4 rebar sticks, 20 ft | 24 sticks | 10% | 27 sticks / 24 × 6 m | USD | $378.00 | 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
$699.11
0.42 nominal 10 yd³ loads · 1 to order
80 lb bags
$1,289.25
60 lb alternative $1,377.00 · delivery weight 17,160 lb
| Thickness | Order yd³ | Order m³ | 80 lb bags | Rebar ft | Ready-mix | 80 lb cost |
|---|---|---|---|---|---|---|
| 4 in | 3.48 | 2.658 | 157 | 359 | $698.63 | $1,059.75 |
| 5 in | 3.86 | 2.949 | 174 | 359 | $761.37 | $1,174.50 |
| 6 in | 4.24 | 3.239 | 191 | 359 | $699.11 | $1,289.25 |
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 6 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 6 inches in thickness, reinforced with #4 bars spaced 18 inches apart. 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 slabs on grade.
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 calculation?
- Soil design is site-specific and requires a geotechnical analysis to determine the appropriate foundation design based on soil conditions.
- What thickness is recommended for a residential slab?
- A thickness of 6 inches is commonly recommended for residential slabs to ensure adequate strength and durability.