Free tools / Brick & cement calculator
Brick, cement & sand calculator for walls and plaster.
Enter the wall size and brick type — get the number of bricks, cement bags and sand in cft, with wastage and cost. Switch to the Plaster tab for plastering material.
- Free · no signup
- Feet or metres
- 1:3 to 1:6 mortar
- Plaster tab
1Wall size
2Brick & mortar
Prices & assumptions
Brickwork materials
- Wall area0
- Wall volume0
- Bricks per m³ (with joints)0
- Mortar — wet / dry0
- Material cost (your prices)₹0
1Area to plaster
2Plaster mix
Prices & assumptions
Plaster materials
- Wet mortar volume0
- Dry volume (× factor)0
- Material cost (your prices)₹0
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How bricks, cement and sand are calculated
Brickwork
- Wall volume = (length × height − openings) × thickness.
- One brick with mortar = (L + joint) × (W + joint) × (H + joint). A modular 190×90×90 mm brick with a 10 mm joint takes 200×100×100 mm = 0.002 m³, so a cubic metre of wall needs 500 bricks.
- Bricks = wall volume ÷ volume of one brick with mortar, plus wastage.
- Wet mortar = wall volume − (bricks × volume of one brick without mortar).
- Dry mortar = wet mortar × 1.33. Dry cement and sand shrink by about a third once water is added and voids fill, so you need ~33% more dry material.
- Cement = dry volume × 1 ÷ (1 + sand parts); bags = cement m³ ÷ 0.0347 (one 50 kg bag at 1,440 kg/m³). Sand = dry volume × sand parts ÷ (1 + sand parts); 1 m³ = 35.31 cft.
Worked example: a 10 ft × 10 ft, 9-inch wall (2.137 m³) with modular bricks and 1:6 mortar needs 1,068 bricks before wastage → 1,122 with 5%; wet mortar 0.493 m³, dry 0.655 m³ → 2.8 bags cement and 20.8 cft sand with 5% wastage.
Plaster
Wet volume = area × thickness; dry volume = wet × 1.33; cement and sand are split by the ratio the same way. Example: 1,000 sq ft of 12 mm plaster in 1:4 → wet 1.115 m³, dry 1.483 m³ → 9.0 bags cement and 44 cft sand with 5% wastage.
Which ratio to use
1:6 is common for 9-inch brick walls, 1:4 for 4.5-inch partition walls and for most plaster; 1:3 for waterproof or external rendering; ceilings are usually plastered 6 mm thick in 1:3 or 1:4. Follow your engineer's specification where you have one.
Assumptions: frog (brick groove) filling, curing water and lime/admixtures are not counted. Brick sizes vary by kiln — measure a few of yours and use Custom. Budgeting a whole house? Try the house construction cost calculator.
Frequently asked questions
How many bricks are in 1 cubic metre of brickwork?
About 500 modular bricks (190×90×90 mm with 10 mm joints). For traditional 230×115×75 mm bricks it is about 390 before wastage.
How many bricks are needed for a 10×10 ft wall?
For a 9-inch wall with modular bricks, about 1,070 bricks, or about 1,120 with 5% wastage. A 4.5-inch wall needs about half.
How much cement is needed for plastering 100 sq ft?
For 12 mm plaster in 1:4, roughly 0.85 bag of cement and 4.2 cft of sand per 100 sq ft before wastage.
Why multiply wet volume by 1.33?
Dry cement and sand occupy more volume than the finished wet mortar because water fills the air gaps. The 1.33 factor (about 33% extra) is the common Indian site thumb rule; you can change it under Prices & assumptions.
What is the volume of one cement bag?
A 50 kg bag of cement is about 0.0347 m³ (1.23 cft), taking cement density as 1,440 kg/m³.
Which mortar ratio is used for brickwork?
1:6 (cement:sand) is common for 9-inch load-bearing brick walls and 1:4 for 4.5-inch partition walls. Your engineer’s specification comes first.