Work out what you need before you buy.
Fast, practical calculators for building, decorating, flooring, landscaping and home improvement. Enter your measurements, get an instant estimate and reduce guesswork before ordering materials.
Building & DIY calculators
Plasterboard Calculator
Calculate sheet quantities from wall dimensions, board size and waste allowance.
Calculate plasterboardStud Wall Calculator
Estimate vertical stud count and approximate timber length for a partition wall.
Calculate studsPaint Calculator
Estimate litres of paint for a room using wall size, coats and paint coverage.
Calculate paintConcrete Calculator
Calculate concrete volume for a slab, base or pad using metric measurements.
Calculate concreteBrick Calculator
Estimate brick quantities from wall area, openings and a waste allowance.
Calculate bricksInsulation Calculator
Estimate insulation area and the number of packs required from product coverage.
Calculate insulationFlooring Calculator
Work out room area and packs of laminate or other packaged flooring.
Calculate flooringTile Calculator
Estimate wall or floor tile quantities from surface and tile dimensions.
Calculate tilesMortar Calculator
Estimate cement and sand quantities for a target mortar volume and mix ratio.
Calculate mortarGravel Calculator
Convert area and depth into cubic metres and approximate tonnes of aggregate.
Calculate gravelPaving Slab Calculator
Estimate how many slabs are needed for a rectangular patio or path.
Calculate pavingDecking Calculator
Estimate linear metres and full board quantities from deck dimensions.
Calculate deckingRoof Tile Calculator
Estimate roof tile quantities from roof area and tiles per square metre.
Calculate roof tilesScreed Calculator
Calculate floor screed volume and approximate premixed bag quantities.
Calculate screedBuilt for UK DIY projects
BuildCalcs UK uses metric measurements and common UK material sizes to make early-stage quantity planning faster. Every calculator runs directly in your browser, with no registration required.
Material coverage and installation requirements can vary by manufacturer and project. Use these tools as planning estimates and check product technical information before ordering or carrying out work.
Why calculate before ordering?
Buying too little can interrupt a project and create extra delivery costs, while buying too much can leave expensive surplus material. A quick estimate gives you a practical starting quantity that can then be checked against pack sizes, supplier guidance and the actual layout.