Construction calculators
Estimate materials and quantities for building projects.
Concrete calculator
Work out how much concrete a slab needs from its length, width, and thickness — in cubic metres, cubic yards, and 25 kg bags, with a waste allowance.
Gravel calculator
Work out how much gravel an area needs from its length, width, and depth — in tonnes and cubic metres, using a bulk density you can adjust.
Tile calculator
Work out how many tiles a floor or wall needs from the area, the tile size, and a waste percentage — with the area and area per tile shown too.