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Calculators

These calculators run in your browser. Each one shows the formula and the assumptions. They estimate quantities such as litres, tiles and cubic metres. They do not produce a price.

Coverage

Paint coverageEstimate litres of paint from area, coats and the coverage printed on the tin.Tile countCount tiles from the area, the tile size and a waste allowance.Insulation battsCount batts from the area you are covering and the area of one batt.

Volume and structure

Concrete volumeCubic metres for a rectangular slab from length, width and depth.Decking boardsHow many boards cover a deck width, and the linear metres of those boards.Fence posts and baysPosts and bays for a straight run at a spacing you choose.Turf and soilSquare metres of a rectangular lawn, and soil volume for a depth you choose.Roof areaEstimate the sloped roof area from the plan size and the pitch.