Free calculators for civil engineers — steel, concrete, brickwork, and unit conversions.
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Steel Bar WeightWeight per bar in kg and kg/ft from diameterConcrete MaterialsCement, sand, aggregate from mix ratioBrickworkBricks, mortar and cement for wallsUnit ConverterLength, area and volume conversionsLand AreaRopani–Aana and Bigha–Kattha to sq ft / sq mSut to mmMason’s sut to millimetre rebar sizesConcrete DUDBCM20/M15 material norms per DUDBCPlaster & ScreedCement and sand for plasterworkCube Test7-day and 28-day strength pass/fail checkLap LengthTension/compression laps and seismic hooksStirrup SpacingDuctile detailing per IS 13920 / NBC 105Formwork StrippingStripping times per IS 456 / NBCGabionStone and wire for gabion boxesPlum Concrete60/40 concrete–boulder splitEarthworkCut/fill by end-area and prismoidal methodsPavementGSB/WBM loose volumes and asphalt tonnageRate AnalysisUnit rate with 15% OHP and 13% VATQuick ReferenceMortar factors and brickwork norms