How to Calculate Weight of Concrete Slab in Tons
If you’re planning a construction project, transporting concrete, or estimating structural load, knowing how to calculate the weight of a concrete slab in tons is essential.
In this guide, we’ll break down:
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How to estimate concrete slab weight
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Convert the result to tons
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Real-world examples
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A free concrete slab weight calculator in tons
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And useful tips to ensure accurate and safe construction.
📐 Formula to Calculate Weight of a Concrete Slab in Tons
To calculate the weight of a concrete slab, you need three values:
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Length (ft)
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Width (ft)
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Thickness (inches)
✅ Step 1: Convert Inches to Feet
Since concrete weight is based on cubic feet, convert thickness:
Thickness (ft) = Thickness (inches) ÷ 12
✅ Step 2: Calculate Volume in Cubic Feet
Volume = Length × Width × Thickness (in feet)
✅ Step 3: Multiply by Concrete Density
A cubic foot of concrete weighs about 150 pounds.
Weight (lbs) = Volume × 150
✅ Step 4: Convert Pounds to Tons
1 ton = 2,000 lbs, so:
Weight (tons) = Weight (lbs) ÷ 2,000
🧮 Example: Slab 20 ft x 10 ft x 6 inches thick
Thickness in feet:
6 ÷ 12 = 0.5 ft
Volume:
20 × 10 × 0.5 = 100 cubic ft
Weight in lbs:
100 × 150 = 15,000 lbs
Weight in tons:
15,000 ÷ 2,000 = 7.5 tons
✅ Final Result: A 20×10 ft concrete slab with 6-inch thickness weighs 7.5 tons.
💡 Use a Free Online Concrete Slab Weight Calculator (Tons)
Skip manual calculation and use our accurate tool:
👉 Concrete Slab Weight Calculator in Tons
Just enter the slab’s dimensions and get instant results in tons, pounds, and kilograms.
🚧 Why Knowing Slab Weight in Tons Matters
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Transport Logistics: Determine the number of truckloads required.
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Crane or Lifting Equipment: Prevent overloading or structural damage.
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Soil Load Bearing Capacity: Avoid soil failure or uneven settlement.
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Cost Estimation: Helps calculate delivery, crane hire, and labor.
🛠️ Pro Construction Tip
Always round up your weight estimate when dealing with large slabs to account for moisture, rebar, or gravel that may increase total weight.
❓ Frequently Asked Questions
1. How much does a 10×10 concrete slab weigh?
For 4 inches thick:
10 × 10 × 0.33 = 33 cubic ft × 150 = 4,950 lbs → ~2.47 tons
2. Can you convert slab weight to kilograms?
Yes! 1 lb = 0.453592 kg
Just multiply your result in lbs by 0.4536.
3. Is slab weight affected by concrete type?
Yes. Lightweight concrete weighs 110–120 lbs/ft³. Heavyweight concrete can weigh more than 180 pounds per cubic foot.
✅ Conclusion
Now you know how to calculate the weight of a concrete slab in tons using simple math or a handy online calculator. Whether you’re a builder, contractor, or DIY enthusiast, knowing the weight of your slab ensures better planning, safer construction, and cost efficiency.
👉 Use our Concrete Slab Weight Calculator in Tons to get accurate results in seconds.