How many blocks for a wall?
With hollow blocks 20x20x40, count 12.5 blocks per m² of wall, plus about 0.5 bag of cement per m² for the laying mortar.
| Wall area | Blocks | Cement (mortar) |
|---|---|---|
| 10 m² | 125 u | 5 bags |
| 20 m² | 250 u | 10 bags |
| 30 m² | 375 u | 15 bags |
| 50 m² | 625 u | 25 bags |
| 80 m² | 1000 u | 40 bags |
| 100 m² | 1250 u | 50 bags |
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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- Deduct about 15 percent for openings (doors, windows).
- Check block quality: a block that is too light or crumbly is a warning sign.