How thick should your concrete floor be? Getting the right slab thickness is crucial for ensuring your concrete can handle vehicles, machinery, or heavy foot traffic without cracking. Whether you're laying a driveway, garage floor, warehouse slab, or industrial flooring, the right depth depends on load weight, reinforcement, and subgrade preparation.
This Concrete Floor Thickness & Load Capacity Calculator helps you determine:
- ✔ The recommended concrete thickness for your specific floor type and expected load.
- ✔ Whether you need reinforcement (rebar, mesh, or none).
- ✔ The estimated concrete volume (m³) required for your project.
Simply enter your floor type, expected load weight, and slab area to get an accurate thickness recommendation in seconds!
- ✔ Choose from options like residential slabs, driveways, garages, industrial floors, or heavy machinery areas.
- ✔ Input the estimated weight (in kg) of the vehicles, equipment, or machinery the floor will support.
- ✔ Enter the total area (in m²) where the concrete will be poured to calculate the required volume.
- ✔ Instantly receive a recommendation for the required concrete thickness based on your inputs.
- ✔The calculator will also determine whether rebar or mesh reinforcement is needed for durability.
- ✔The tool calculates how much concrete (in m³) you’ll need to complete your project.
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How thick should a concrete driveway be?
A residential driveway should be 100-125mm (4-5 inches) thick for regular cars.
For trucks & heavier vehicles, 150-175mm (6-7 inches) is recommended with rebar or mesh reinforcement.
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What’s the best concrete thickness for a garage slab?
A single-car garage typically needs 100-125mm (4-5 inches).
For trucks, RVs, or heavy-duty use, go for 150mm+ (6 inches) with steel mesh or rebar.
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Does industrial flooring require extra-thick concrete?
Yes! Industrial slabs should be at least 150-200mm (6-8 inches) for standard loads,
and 250mm+ (10+ inches) with heavy reinforcement for forklifts, machinery, or high-traffic areas.
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Do I need rebar in my concrete slab?
✔ No reinforcement → Suitable for light residential loads (walkways, patios).
✔ Wire mesh → Helps prevent cracking in medium-load areas (driveways, garages).
✔ Rebar (steel reinforcement) → Required for heavy vehicles, forklifts, and industrial floors.
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How do I calculate the concrete volume needed for my slab?
Use the formula:
Volume (m³) = Slab Area (m²) × Thickness (meters)
Example: A 30m² slab at 150mm thickness needs 4.5m³ of concrete.