Block Calculator
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6″ Hollow Blocks
- Wall area
- 0.0 m²
- Less doors & windows
- 0.0 m²
- Blocks per m²
- 9.25
Free delivery to site. An estimate for 450 × 225 mm blocks with 10 mm joints — your builder’s or quantity surveyor’s figures take priority.
The method
How the count works
A standard block has a 450 × 225 mm face. With a 10 mm mortar joint on each side, one block covers 0.46 × 0.235 m — about 0.108 m² — so a square metre of wall takes about 9.25 blocks. Hollow and solid blocks, and the 6, 5 and 4 inch sizes, all share that face, so the count is the same for each.
Example: a wall 10 m long and 3 m high is 30 m². 30 × 9.25 = 278 blocks, and with 5% allowed for breakage and cutting, about 292 blocks.
Take the doors and windows out of the area first — a door is roughly 2 m² and a window about 1.5 m². Not sure which size to use? Our FAQ explains which block goes where, or ask us.
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Send the blocks, the quantity and the place. We reply on WhatsApp with a price.