Solid / hollow blocks, cement and sand for walls
Blocks Required
0
nos
Net wall area
A = (Length × Height − Openings) × No. of such walls
= (0 × 0 − 0) × 1
= 0 m²
Two faces of the same length? Enter the wall once and set the count to 2 — the block count, mortar, cement and sand all scale with it.
Block count
Blocks = A × 12.5 per m²
= 0 × 12.5
= 0 nos of 4" (100 mm) blocks
12.5 comes from 1 m² ÷ (0.40 × 0.20 m block face).
Wall volume
V = A × Thickness
= 0 × 0
= 0 m³
Mortar volume
Mortar = 10% of wall volume
= 0 × 0.10
= 0 m³ wet (0 m³ dry)
Blockwork needs far less mortar than brickwork — only ~10%.
Cement in the mortar (1:6)
Cement = Mortar × 1/7 ÷ 0.035 m³ per bag
= 0 × 1/7 = 0 ÷ 0.035
= 0 bags
Sand in the mortar
Sand = Mortar × 6/7
= 0 × 6/7
= 0 m³
Breakage allowance
Order = Blocks × 1.05
= 0 × 1.05
= 0 blocks
Method used: Unit-area method — blocks per m² with IS 2185 block sizes and IS 2572 mortar practice
Block walls are measured by face area: one standard 400 × 200 mm block face covers 0.08 m², so 12.5 blocks make 1 m². The block length (400 mm) is fixed; the thickness you choose sets the block type — 100 mm (4"), 150 mm (6") or 200 mm (8"). Mortar joints in blockwork are fewer than brickwork, so mortar is only about 10% of the wall volume, split 1:6 into cement and sand with the 1.33 dry factor.
Estimates for guidance only. Confirm quantities with your site engineer.
© 2026 SiteMate. All rights reserved.