Free tools
Construction calculators, free in your browser
The same calculations our apps run on site — open, use, done. Each tool links to the guide that explains the method behind it, so you always know where the number came from. No sign-up, nothing stored.
Concrete volume calculator
Volume for a slab, beam, column or footing, plus cement, sand, aggregate and water for any grade.
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Brick & block calculator
Brick or block count for any wall, with mortar, openings deducted and wastage added.
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Steel weight & BBS calculator
Cutting lengths with bend deductions, d²/162 bar weights and a full schedule total.
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House construction cost calculator
A stage-wise build estimate from your built-up area and your own local rate.
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Tile & flooring calculator
Tile count for any room and tile size, with grout gap, wastage, boxes and skirting.
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Paint quantity calculator
Litres of paint and primer per coat, from wall and ceiling areas with openings deducted.
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Plaster quantity calculator
Cement and sand for internal or external plaster at any thickness and mix ratio.
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Construction unit converter
Length, area, volume and weight across metric and imperial — plus feet-inch fractions.
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Need the document, not the number?
Professional construction templates — site reports, work orders, checklists — ready to download.
On site, offline
No signal at the site? Every calculator here works offline in Construction Calculator A1.
Trusted by professionals in 150+ countries — with PDF export, a bill of quantities and metric or imperial throughout.