Building calculators

Work out how much concrete, brick, mortar, plaster or timber a job needs, in the bags, tonnes and lengths UK merchants sell.

Which tool do I need?

If you're…	Use
Pouring a slab, footing or post holes	Concrete calculator
Building a wall	Brick calculator
Mixing mortar or render	Sand and cement calculator
Levelling a floor	Screed calculator
Boarding and skimming walls	Plasterboard calculator
Planning new stairs	Stair calculator

Concrete calculatorWork out how much concrete you need for a slab, a footing, post holes or steps.
Brick calculatorWork out how many bricks or concrete blocks you need for a wall.
Roof pitch calculatorWork out the pitch of a roof in degrees, as a ratio (x in 12) and as a percentage.
Stair calculatorWork out how many steps a staircase needs, and the rise and going of each one, from the floor-to-floor height and the space you have.
Mortar calculatorWork out how much mortar you need for bricks, blocks, a wall or a mortar bed under paving.
Screed calculatorWork out how much floor screed you need from the size of the room and the thickness.
Plasterboard calculatorWork out how many sheets of plasterboard you need for the walls of a room, the ceiling or both.
Sand and cement calculatorPick the job, give the size and choose a mix, and this works out the cement and sand to buy.
Timber calculatorWork out the timber for a stud wall, or turn metres of timber or an area of boards into lengths to buy.
Plaster calculatorWork out how many 25 kg bags of plaster you need for a room.