How many concrete blocks per m² for a wall?
A standard 50 × 20 cm block covers 0.10 m² including joints: you therefore need 10 per m². The calculator adds breakage and estimates the laying mortar.
| 📐 Wall area | |
| ▦ Blocks (incl. 7% breakage) | |
| 🪣 Estimated laying mortar |
Remember corner blocks, tie-beam U-blocks and lintels depending on your structure: they are counted separately. Laying mortar is estimated at about one 25 kg bag per m² of wall in 20 cm blocks.
Reference
| Wall | Blocks 50×20 |
|---|---|
| 1 m² | 10 |
| Wall 10 m × 2.5 m (25 m²) | 250 (+ breakage ≈ 268) |
| Fence 20 m × 2 m (40 m²) | 400 (+ breakage ≈ 428) |