How many bags of cement for a slab?
For a 15 cm solid slab dosed at 350 kg/m³, count about 1.05 bag of 50 kg cement per m² of slab (7 bags per m³ of concrete). Here are the quantities for common areas.
| Slab area | Concrete (15 cm) | Cement | Sand | Gravel |
|---|---|---|---|---|
| 20 m² | 3 m³ | 21 bags | 1.2 m³ | 2.4 m³ |
| 30 m² | 4.5 m³ | 32 bags | 1.8 m³ | 3.6 m³ |
| 50 m² | 7.5 m³ | 53 bags | 3 m³ | 6 m³ |
| 80 m² | 12 m³ | 84 bags | 4.8 m³ | 9.6 m³ |
| 100 m² | 15 m³ | 105 bags | 6 m³ | 12 m³ |
| 150 m² | 22.5 m³ | 158 bags | 9 m³ | 18 m³ |
Indicative estimates (concrete dosed at 350 kg/m³, 7 cement bags per m³). They help you check a quote, not replace an engineer.
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Generate my plan for freeKey points
- A thicker slab (20 cm) increases quantities by about a third.
- Always add 5 to 10 percent for waste.
- Count the bags at delivery: it is the easiest item to divert.