Wall Dimensions
440 × 215 × 100mm (standard hollow)
Add 5% for breakages
Subtract area for doors and windows
Results
Enter dimensions and click Calculate to see results
UKUK Building Regulations
References & Sources
Standards Cited
- BS EN 771-3 — Specification for masonry units — Aggregate concrete masonry units
Defines standard block dimensions (440x215mm, 440x140mm, 610x270mm) and tolerances used in the calculator - BS EN 1996-1-1 — Eurocode 6 — Design of masonry structures — General rules for reinforced and unreinforced masonry structures
Design rules for blockwork including mortar joint specifications and structural requirements
Formulas Used
- Blocks per m2:
blocksPerM2 = 1 / ((blockLength + mortarJoint) x (blockHeight + mortarJoint))
Source: BS EN 771-3 / BS EN 1996-1-1 — Standard 440x215mm block with 10mm joints gives approximately 10 blocks per m2 - Total blocks:
totalBlocks = ceil(netWallArea x blocksPerM2 x (1 + wastage/100))
Source: Standard quantity surveying method
Key Assumptions
- Standard block: 440 x 215 x 100mm; solid/paint grade: 440 x 140 x 100mm; large format: 610 x 270 x 100mm — BS EN 771-3
- Default mortar joint width: 10mm — BS EN 1996-1-1
- Typical wastage allowance of 5% for cutting and breakage — Industry standard practice