Calculators for builders and DIY

Work out how much concrete you need for a slab, base or path, with extra for waste and an approximate weight.

Work out how many tonnes of gravel, MOT Type 1 or sand you need for a driveway, path or base, and how many bulk bags or small bags that is.

Work out how many tiles and boxes you need for a floor or wall, allowing for grout gaps and extra for cuts and breakages.

Work out how much paint you need for a room's walls or ceiling, allowing for doors, windows and the number of coats, with tin sizes to buy.

Work out how many rolls of wallpaper you need for a room or feature wall, allowing for the pattern repeat.

Find a roof's pitch from its rise and run, or the roof height from the pitch. In degrees, rise in 12 and percent, with the rafter length.

Square any corner with the 3-4-5 rule: enter one side to get the other and the diagonal to measure, or use the real lengths of any two sides.

How many turns of a screw or thread to move a set distance, or how far a number of turns moves it: metric, UNC, UNF or any pitch, in turns and degrees.

Work out the area of a rectangle, triangle, circle, trapezium, parallelogram or ellipse in m², ft², acres or hectares, with the formula.

Work out the volume of a box, cylinder, sphere, cone or pyramid in m³, litres, ft³ or gallons, with the formula for each shape.