What is the thickness of the slab?

The slab is designed to be 8 inches thick.

What type of reinforcement is used?

The slab uses #4 reinforcement bars spaced at 18 inches.

Where can I find more information on slab construction?

You can refer to the International Residential Code (IRC) R506 for detailed guidelines on concrete slab construction.

14 by 14 ft slab at 8 inches

Calculate the specifications for a 14 ft by 14 ft residential slab at 8 inches thick with #4 reinforcement bars spaced at 18 inches. Excludes soil design considerations as per IRC R506.

Formula SSC-2026.1

Formula SSC-2026.1 · 4,000 PSI

Order volume

6.03 yd³

4.610 m³ placed+waste

Order weight

24,420 lb

11,077 kg

80 lb bags

272

7 pallets at 42 bags

60 lb bags

362

0.45 ft³ yield each

Rebar

392.00 ft

26 × 20 ft · 26 × 6 m · 288 lb

Ready-mix vs bags

$994.89

Truck $994.89 · 80 lb bags $1,836.00

Slab footprint and rebar gridLive scaled blueprint

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.

Bill of materials and shopping list
Item	Net	Waste	Order	Unit price	Line total	Source Spec Material / Tool
Ready-mix concrete	5.48 yd³	10%	6.03 yd³ / 4.610 m³	USD	$994.89	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	246.7 bags	10%	272 bags	USD	$1,836.00	Source Spec Material / Tool
60 lb pre-mix bags	328.9 bags	10%	362 bags	USD	$1,954.80	Source Spec Material / Tool
#4 rebar sticks, 20 ft	26 sticks	10%	29 sticks / 26 × 6 m	USD	$406.00	Source Spec Material / Tool
Rebar chairs	100 crossings	10%	110 chairs	USD	$30.80	Source Spec Material / Tool
Tie wire rolls	100 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

$994.89

0.60 nominal 10 yd³ loads · 1 to order

80 lb bags

$1,836.00

60 lb alternative $1,954.80 · delivery weight 24,420 lb

Side-by-side thickness comparison at the same footprint
Thickness	Order yd³	Order m³	80 lb bags	Rebar ft	Ready-mix	80 lb cost
4 in	4.07	3.115	184	431	$672.22	$1,242.00
5 in	4.56	3.489	206	431	$752.89	$1,390.50
6 in	5.05	3.862	228	431	$833.56	$1,539.00

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 14 ft slab at 8 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 slab measuring 14 ft by 14 ft and 8 inches thick, reinforced with #4 bars spaced at 18 inches. Please note that soil design considerations are excluded from this calculation.

Refer to the International Residential Code (IRC) R506 for guidelines on concrete slabs, ensuring compliance with local building codes and practices.

Code reference

IRC R506

Field questions

What is the thickness of the slab?: The slab is designed to be 8 inches thick.
What type of reinforcement is used?: The slab uses #4 reinforcement bars spaced at 18 inches.
Is soil design included in this calculation?: No, soil design considerations are excluded from this calculator.
Where can I find more information on slab construction?: You can refer to the International Residential Code (IRC) R506 for detailed guidelines on concrete slab construction.