8 Inch Concrete Slab Calculator
This 8 inch concrete slab calculator instantly converts your slab's length and width into cubic yards, cubic meters, bags and estimated cost at a fixed 8-inch thickness — the depth typically used for heavy equipment pads, structural slabs and commercial floors.
Comment utiliser ce calculateur
- Saisissez vos dimensions — pieds pour les longueurs, pouces pour l'épaisseur.
- Ajustez les options — pourcentage de perte, taille du sac et prix local du béton.
- Lisez vos résultats — le volume, les sacs, le poids et le coût se mettent à jour en direct.
La formule
Volume = Length × Width × 8/12 ft, then ÷ 27 for cubic yards Exemple résolu : A 10 ft × 10 ft slab at 8 inches: 10 × 10 × 0.667 = 66.7 ft³ ÷ 27 ≈ 2.47 yd³ before waste.
A slab poured 8 inches thick is the standard choice for heavy equipment pads, structural slabs and commercial floors. At this thickness, one cubic yard of concrete covers about 41 square feet, which makes ordering straightforward once you know your slab area.
A slab 8 inches thick is heavy-duty territory: equipment pads, loading areas, commercial floors and structural slabs. At this depth one cubic yard covers only about 40 square feet, ready-mix is essentially mandatory, and the slab should be engineered — reinforcement, joint layout and subgrade prep matter as much as the concrete volume.
Enter your dimensions above and the calculator handles every conversion — cubic feet, cubic yards, cubic meters and litres — plus the number of bags by size and a 5–10% waste allowance so you don't run short mid-pour.
Foire aux questions
Questions courantes sur le 8 inch concrete slab calculator.
How much concrete do I need for a 8 inch slab?
Multiply length × width in feet, then multiply by 0.667 (8 inches in feet) to get cubic feet, and divide by 27 for cubic yards. A 12 × 12 ft slab needs about 3.56 yd³.
How much area does one yard cover at 8 inches thick?
About 41 square feet. The rule of thumb is coverage (ft²) = 324 ÷ thickness in inches.
How many 80 lb bags for a 8 inch slab?
Each 80 lb bag yields ≈ 0.60 ft³. For a 10 × 10 ft slab at 8 inches (66.7 ft³) you'd need about 112 bags before waste.
Is 8 inches thick enough for my project?
8 inches suits heavy equipment pads, structural slabs and commercial floors. Thinner slabs are limited to toppings and paths; driveways need 5–6 inches and heavy-equipment pads 8 inches with rebar.
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