3 Inch Concrete Slab Calculator
This 3 inch concrete slab calculator instantly converts your slab's length and width into cubic yards, cubic meters, bags and estimated cost at a fixed 3-inch thickness — the depth typically used for light-duty pads, garden paths and mower strips.
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 × 3/12 ft, then ÷ 27 for cubic yards Exemple résolu : A 10 ft × 10 ft slab at 3 inches: 10 × 10 × 0.250 = 25.0 ft³ ÷ 27 ≈ 0.93 yd³ before waste.
A slab poured 3 inches thick is the standard choice for light-duty pads, garden paths and mower strips. At this thickness, one cubic yard of concrete covers about 108 square feet, which makes ordering straightforward once you know your slab area.
A concrete calculator for 3 inch slab pours is handy for garden paths, light pads and pavers' bases. Three inches keeps material cost down but demands a well-compacted gravel base — thin slabs are unforgiving of soft spots. Keep control joints at 6 ft or closer.
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 3 inch concrete slab calculator.
How much concrete do I need for a 3 inch slab?
Multiply length × width in feet, then multiply by 0.250 (3 inches in feet) to get cubic feet, and divide by 27 for cubic yards. A 12 × 12 ft slab needs about 1.33 yd³.
How much area does one yard cover at 3 inches thick?
About 108 square feet. The rule of thumb is coverage (ft²) = 324 ÷ thickness in inches.
How many 80 lb bags for a 3 inch slab?
Each 80 lb bag yields ≈ 0.60 ft³. For a 10 × 10 ft slab at 3 inches (25.0 ft³) you'd need about 42 bags before waste.
Is 3 inches thick enough for my project?
3 inches suits light-duty pads, garden paths and mower strips. 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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