eGigFree engineering calculators
Quick quantity and electrical calculators for site engineers, contractors, students and anyone planning building work. They are free and need no sign-up.
Civil and construction
Concrete Calculator: Cement, Sand and AggregateWork out cement bags, sand and aggregate for any slab, footing or column, in m³, cft and brass, for M10 to M25.Brick Calculator: Bricks, Cement and Sand for a WallCount the bricks, cement bags and sand for a wall, in feet or metres, for modular, traditional or custom brick sizes.Steel Weight Calculator: TMT Bars in kgWork out the weight of TMT bars by diameter and length with the D²/162 rule, and the weight of steel plates.Plaster Calculator: Cement and SandWork out cement bags and sand for wall and ceiling plaster, by area, thickness and mix.Tile Calculator: Tiles and Boxes for a RoomWork out how many tiles and boxes to buy for a floor, with an allowance for cuts and breakage.Paint Calculator: Litres for a RoomWork out how many litres of paint a room needs, by size, coats and the coverage on your tin.
Electrical
Units and study
Unit Converter: Feet, Guntha, Brass, kg and MoreConvert length, area, volume, weight, pressure, temperature, power and speed, including guntha, gaj, acre and brass.Percentage Calculator: Marks, Change and DiscountsWork out marks percentage, a percent of a number, a percent change, and a percent added or taken off.CGPA to Percentage Calculator: CBSE, SPPU, Mumbai, VTUConvert CGPA to percentage by the formulas commonly quoted, side by side, with a clear note on what your university decides.
More from eGig
Questions people ask
Can I rely on these for structural design?
No. They estimate quantities for planning and buying materials. Structural design, reinforcement and safety decisions need a qualified structural engineer and the current Indian Standard codes.
Why add extra material for wastage?
Materials get cut, spilled and broken on site, so buying the exact calculated amount usually leaves you short. Ask your contractor what allowance suits the work, and buy from one batch where colour matters.
Which units do they use?
Most accept both metric and common site units, and the unit converter covers feet, guntha, gaj, acre, brass, kg and more. Check which unit each field asks for before you read the result.