Concrete Slab Calculator
Use this concrete slab calculator to size any flat pour — patios, shed bases, garage floors, driveways and house slabs. Enter dimensions by feet or meters (or work from square feet with a known thickness) and get volume, bags and cost instantly.
इस कैलकुलेटर का उपयोग कैसे करें
- अपने आयाम दर्ज करें — लंबाई के लिए फीट, मोटाई के लिए इंच.
- विकल्प समायोजित करें — अपव्यय प्रतिशत, बैग का आकार और आपके स्थानीय कंक्रीट की कीमत।
- अपने परिणाम पढ़ें — टाइप करते ही आयतन, बैग, वजन और लागत लाइव अपडेट होते हैं।
सूत्र
Slab volume = Length × Width × Thickness; by square feet: Volume (ft³) = Area (ft²) × Thickness (ft) हल किया गया उदाहरण: A 24 × 24 ft garage slab at 4 in: 576 ft² × 0.333 ft = 192 ft³ ÷ 27 ≈ 7.11 yd³ — order 7.5–8 yd³ with waste.
A concrete calculator for slab work needs to get three things right: thickness conversion (inches to feet trips everyone up), waste allowance, and the coverage math when you're working by square feet. This tool handles all three.
Working from area? At 4 inches thick, every 81 square feet needs one cubic yard. At 6 inches, one yard covers just 54 square feet. That's why a concrete slab calculator by square feet always asks for thickness — coverage changes fast.
For fixed-depth pours, jump to the dedicated 2, 3, 6, and 8 inch slab calculators, which lock the thickness so you only enter length and width.
अक्सर पूछे जाने वाले प्रश्न
concrete slab calculator के बारे में सामान्य प्रश्न।
How thick should my concrete slab be?
4 inches for patios, walkways and shed bases; 5–6 inches for driveways; 6–8 inches for garage floors and slabs carrying trucks or equipment (with rebar).
How do I calculate a slab by square feet?
Multiply your area in square feet by the thickness in feet (inches ÷ 12), then divide by 27 for cubic yards. Example: 400 ft² × 0.333 = 133 ft³ ÷ 27 ≈ 4.94 yd³.
How many bags of concrete for a slab?
Divide slab volume in cubic feet by the bag yield: 0.60 ft³ per 80 lb bag, 0.45 ft³ per 60 lb bag. A 10 × 10 ft slab at 4 in needs about 56 × 80 lb bags before waste.
Should I use ready-mix or bags for a slab?
Over about one cubic yard, ready-mix is cheaper and far less labor. Bags suit small pads, repairs and pours where a truck can't reach.
संबंधित कैलकुलेटर
कंक्रीट कैलकुलेटर परिवार के और उपकरण।