Quantities, weights and costs for the site, worked out before you order
Building work is bought by the bag, the tonne and the running foot, and a wrong quantity costs a trip, a delay or a skip of waste. These free construction calculators give the numbers first. The steel weight calculator turns TMT bar sizes into kilograms with the IS 1786 table or D²/162, and the sheet metal weight calculator, pipe weight calculator and structural steel section calculator cover plates, gauges, IS 1239 pipes and ISMB, ISMC and ISA sections. The house construction cost calculator and material quantity estimator give a floor-wise budget with cement, steel, sand and bricks.
For reinforced concrete, the rebar calculator and steel quantity calculator count bars for slabs, beams and columns, the bar bending schedule generator prints a BBS with IS 2502 hook and bend allowances, and the shuttering calculator works out formwork area and props. The beam calculator draws shear force, bending moment and deflection diagrams, the retaining wall calculator checks overturning and sliding, and the concrete cube strength calculator applies the IS 456 acceptance rules to your test results.
Finishes and site work have their own tools: the plaster calculator, waterproofing calculator, anti-termite treatment calculator to IS 6313, drywall calculator, false ceiling calculator, excavation and cut-and-fill calculator, gravel calculator and septic tank size calculator for IS 2470, UK and US rules. For services there is the pipe size calculator, the water pump HP calculator and the electrical load calculator.
Planning, area and labour
- Area. The plinth area calculator measures floors by IS 3861 and prices them at a plinth-area rate, and the running feet calculator converts rft, rmt and square feet for skirting, railings and borders.
- Labour. The labour cost calculator turns quantities into man-days per trade using published output norms, with your own daily wages.
- Levels. The slope calculator converts percent, degrees and 1:n and checks ramps and drain falls against common code limits.
- Timber and walls. The board foot calculator, stud calculator, siding calculator, insulation calculator, asphalt calculator and topsoil and mulch calculator cover framed and landscaping work.
Related tools elsewhere on the site
- Concrete and masonry. The concrete calculator (M15, M20, M25 and cement bags), brick calculator, tile calculator, paint calculator and stair calculator sit in the home and DIY sector.
- Property. The carpet area calculator and FSI calculator are in the real estate sector.
Construction & Civil: frequently asked questions
Are these construction calculators free?
Yes. They are free, need no account and run in your browser, so your drawings, quantities and rates stay on your device.
Which standards do the calculators follow?
Indian tools follow the BIS codes named on each page, such as IS 456 for concrete, IS 1786 for TMT bars, IS 2502 for bar bending, IS 1661 for plaster, IS 2470 for septic tanks, IS 6313 for anti-termite work and IS 3861 for plinth area. Other pages cite ASTM, ACI, NEC, UK Approved Documents or US state rules. Each page shows the source and the date it was checked.
Can I use these results for a structural design?
No. They are estimates for planning, budgeting and study. A qualified engineer must design and check foundations, beams, retaining walls and other structures, and a licensed electrician must check electrical loads.
Why do thumb-rule quantities differ from my contractor’s figures?
Rules such as cement bags per square foot are averages from published guides, not code values. Real quantities depend on the design, the mix, wastage and site conditions, so every rule on these pages is editable.
How do I get steel weight per metre?
Use the IS 1786 nominal mass for the bar size, or the shortcut D²/162 kilograms per metre where D is the diameter in millimetres. The steel weight calculator shows both and multiplies by length and number of bars.