Reference 1
- Slab
- 10 x 10 x 0.33 ft
- Wet volume
- 0.93 m³
- +10% wastage
- 1.02 m³
- Approx cement
- 7 bags
Everyday & Tools
Concrete Cement Estimator
Estimate concrete slab volume, cement bags, sand, and aggregate using slab dimensions, unit selection, nominal mix ratios, and 10% wastage.
Formula Explanation
Wet volume = L x W x T; dry volume = wet volume x (1 + wastage%) x 1.54Concrete estimation converts slab dimensions to cubic meters, adds a wastage buffer, then splits dry volume into cement, sand, and aggregate by nominal mix ratio.
Step-by-Step Example
- 1Convert length, width, and thickness to meters if feet are selected.
- 2Multiply length by width by thickness to get wet concrete volume.
- 3Add wastage, then multiply by 1.54 to estimate dry material volume.
- 4Split dry volume by the selected mix ratio and convert cement volume to 50 kg bags.
Reference
Benchmark Table
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Reference 2
- Slab
- 20 x 12 x 0.5 ft
- Wet volume
- 3.40 m³
- +10% wastage
- 3.74 m³
- Approx cement
- 24 bags
Reference 3
- Slab
- 30 x 20 x 0.5 ft
- Wet volume
- 8.50 m³
- +10% wastage
- 9.34 m³
- Approx cement
- 60 bags
FAQ
A wastage buffer covers uneven ground, spillage, compaction variation, measurement error, and small site losses.
It means 1 part cement, 2 parts sand, and 4 parts aggregate by volume.
For estimation, one 50 kg cement bag is about 0.0347 cubic meters, so bag count depends on mix ratio and dry volume.
Use it for estimation only. Structural concrete design and grade selection should follow engineer-approved specifications.
Concrete volume with wastage
3.74 m³