Sumivo · Construction
Concrete Block Calculator
Calculate the number of blocks needed for a wall, including a waste allowance.
01 / inputs
m²
m
m
%
02 / result
BLOCKS NEEDED
275
- Blocks needed
- 275
- Block face area
- 0.08 m²
Calculation trace
- 0.4 m × 0.2 m = 0.08 m²0.08 m²Block face area
- ceil((20 m² × (1 + 10 ÷ 100)) ÷ 0.08 m²) = 275275 blocksBlocks including waste
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SOURCES
- Bureau International des Poids et Mesures (BIPM)The International System of Units (SI), 9th edition ↗
SI unit of area (square metre); wall area ÷ block face area, user-entered block size
Accessed 2026-08-19