Bricks, cement, tiles, paint and steel, counted the way a site actually buys them
Everything here runs in your browser. Files are never uploaded.Every material on a building site is quoted in one unit and bought in another. Concrete is designed by volume and bought in 50 kg bags. Sand is measured in cubic metres and sold by the brass. Tiles are counted per square foot and delivered in boxes. These calculators do that translation, and each of them shows the conventional factor it used rather than hiding it, so you can argue with the number instead of trusting it.
Brick Calculator counts bricks by volume, from your brick size, mortar joint, wastage and the openings you deduct. It also gives the mortar left over as a dry volume, which feeds straight into the next tool.
Cement Calculator turns that dry volume, or a slab you measure yourself, into bags of cement, sand and aggregate for the mix ratio you choose. Three conventions sit underneath it and all three are editable: the dry volume factor, cement's bulk density, and the weight of a bag.
Tile Calculator counts tiles and boxes for a floor or a wall, including the grout line, which is why its answer is slightly larger than area divided by tile size. Paint Calculator turns a room into litres from the coverage printed on the tin, with primer worked out separately, and suggests the tin sizes to buy.
Steel Weight Calculator converts bar diameter and length into kilograms, showing both the site shorthand of diameter squared over 162 and the exact figure from the density you set. Rebar is sold by weight and delivered by count, so the bars-per-tonne figure is the one to check a delivery against.
Measure everything once, in one unit, and write it down. Then: brickwork before mortar, because the mortar quantity comes out of the brick count. Mortar and concrete before cement, because both become bags. Tiles and paint last, since they depend on finished surfaces. Steel on its own, from the bar bending schedule.
Wastage compounds. Five per cent on bricks and ten on tiles and a rounding up to whole bags at every step adds more than any single allowance suggests, so decide your wastage once per material and do not add a margin twice. And every result rounds up to a purchase unit: nine and a bit boxes of tiles is ten boxes. That rounding usually moves the order more than the arithmetic did.
These are estimates for ordering and for checking a quotation. A structural drawing and your engineer govern.
About 95 for a single-brick wall in Indian modular bricks of 190 by 90 by 90 mm with 10 mm joints, which works out to 500 bricks per cubic metre. A different brick size or joint changes it, which is why both are boxes you can edit.
Because concrete is measured wet in the space it fills, and cement, sand and aggregate are bought dry, taking up more room before water closes the voids. The 1.54 factor is site convention rather than a standard, and is quoted anywhere from 1.50 to 1.57.
Around five per cent for bricks, five to ten for tiles laid straight and fifteen or more for a diagonal or patterned floor, and a small allowance on paint for the roller and tray. Set it once per material rather than adding a margin at each step.
Divide the wall area less doors and windows by the coverage on the tin, then multiply by the number of coats. A smooth interior wall takes around 10 square metres per litre; rough plaster is closer to 7, and bare plaster drinks more on the first coat.
It gives the weight in kilograms per metre of a round steel bar from its diameter in millimetres. A 12 mm bar is 144 divided by 162, which is 0.888 kg per metre. The 162 is steel density and geometry rounded off, and it runs about a sixth of a per cent light.
Use them to order material and to check a quotation you have been given, which is where they save real money. Structural quantities come from the drawings and the engineer, not from an area and a ratio.