Construction calculators
Estimate concrete, paint, flooring, roofing, tiles and lumber for a project. Each calculator states its waste allowance openly, so you can see how much extra material the estimate includes and change it.
Concrete slab calculator
Work out how many cubic metres of concrete to order for a rectangular slab, with an allowance.
Flooring calculator
Work out how many packs of laminate or wood flooring to buy for a room, rounded up to whole packs.
Board foot calculator
Work out board feet of lumber from actual thickness, width, length and the number of boards.
Paint calculator
Work out how many litres of paint to buy from wall area, coats and the coverage on the label.
Roof area calculator
Turn a roof footprint and pitch into sloped roof area for ordering shingles, tiles or sheets.
Tile calculator
Work out how many tiles to buy for a floor or wall from the area and tile size.