ConverterAZ.com

Construction Material Calculator

Bricks, cement, sand, aggregate, steel, paint and tiles for walls, plaster, RCC slabs, painting and flooring, with cost per square foot

ft
ft
in
sq ft
%
৳
Quantities
Net wall area
200 sq ft
Brickwork volume: 83.3 cft (2.36 m³)
Bricks to buy (with wastage)
990 pcs
942 + 5% · 4.71 bricks per sq ft
Cement
2.9 bags
3.65 cft · Dry mortar 25.6 cft
Sand
21.9 cft
0.62 m³
Cost estimate
Bricks
৳11,880
Cement
৳1,607
Sand
৳986
Labour
৳5,000
Total cost
৳19,473
Cost per sq ft: ৳97.36

How it works

  • Brickwork: bricks = wall volume ÷ volume of one brick with 10 mm mortar; mortar = wall volume − brick volume; dry mortar = 1.33 × wet.
  • Plaster: wet volume = area × thickness; dry volume = 1.33 × wet, plus wastage; split by the cement : sand ratio.
  • Concrete: dry volume = 1.54 × wet volume; split by the grade ratio (M20 = 1 : 1.5 : 3); steel = volume in m³ × kg per m³.
  • Paint: litres = area × coats ÷ coverage; primer and putty likewise from their own coverage figures.
  • Flooring: tiles = floor area ÷ tile area, rounded up after wastage; boxes = tiles ÷ tiles per box.

One 50 kg cement bag is taken as 1.25 cft (0.0347 m³).

About material estimation

Every house build in Bangladesh and India runs on the same handful of take-offs: how many bricks for the walls, how many bags of cement and cft of sand for the mortar and plaster, how much stone chips and steel for the roof slab, and how many litres of paint and boxes of tiles to finish. Getting these roughly right before ordering avoids both shortages mid-job and leftover material you cannot return.

This calculator uses the standard thumb rules taught in civil engineering and used on site: a 1.33 dry factor for mortar, 1.54 for concrete, nominal mix ratios by grade, and typical steel densities per element. Treat the output as a budget figure and let the engineer or mistri confirm the final quantities.

Handy thumb rules

  • A 5-inch brick wall uses about 5 bricks per sq ft; a 10-inch wall about 10.
  • 100 sq ft of 12 mm plaster in 1:4 needs roughly 1 bag of cement and 5 cft of sand.
  • 100 cft of M20 concrete needs about 22 bags of cement, 42 cft of sand and 84 cft of stone chips.
  • A roof slab carries about 80 kg of steel per m³; beams 100 to 130 kg; columns 150 to 200 kg.
  • One litre of emulsion paint covers about 100 to 140 sq ft per coat; plan on two coats over primer.

Tips

  • Deduct door and window openings from wall area for bricks and plaster, but note that lintels and sills add a little back.
  • Sand and stone chips are sold by the cft or by the truck in Bangladesh and by the cft or tonne in India. Convert the result using the volume converters if your supplier quotes differently.
  • Keep 5% wastage for bricks and tiles, 10% for plaster and 2% to 3% for concrete. Cutting-heavy layouts with many corners need more.

❓ Frequently asked questions

How many bricks are needed for 100 sq ft of 5-inch wall?
About 450 to 500 bricks with a standard 9.5 × 4.5 × 2.75 inch brick and 10 mm mortar joints, after adding 5% wastage. A 10-inch wall needs roughly double.
How much cement and sand for 100 sq ft of plaster?
For 12 mm thick plaster in a 1:4 mix you need roughly 1 bag of cement and about 5 cft of sand, including wastage. A 1:6 mix uses less cement and more sand.
How much cement, sand and stone chips for a roof slab?
For M20 (1:1.5:3) concrete, each 100 cft of slab needs about 22 bags of cement, 42 cft of sand and 84 cft of stone chips, plus about 80 kg of steel per m³ of concrete.
How many litres of paint for a room?
Add the wall and ceiling area, subtract doors and windows, multiply by the number of coats and divide by the coverage. A 12 × 12 ft room with 10 ft walls has about 480 sq ft of wall; two coats at 120 sq ft per litre needs about 8 litres plus 4 litres of primer.
How many tiles do I need for a 400 sq ft floor?
With 2 × 2 ft tiles (4 sq ft each) you need 100 tiles, or 110 with 10% wastage, which is 28 boxes of 4. With 1 × 1 ft tiles it is 440 tiles.