Free tools

Home improvement calculators

12 calculators that answer the question the store assistant asks: how much do you actually need? Every quantity is rounded up to what you buy, with the waste factor and the cost range shown, and the working explained so you can check it.

No sign-up, no credits, no email. Then when you know the numbers, see the finished room before you spend anything.

Interior

Paint CalculatorEnter your room size and get the exact number of gallons to buy — walls, ceiling, and trim, adjusted for coats and openings.Flooring CalculatorSquare footage, boxes to buy and an installed cost range for vinyl, laminate, hardwood, tile or carpet.Tile CalculatorGet tile count, boxes, grout and thinset for a floor, backsplash or shower wall — with the waste factor set by your layout, not a guess.Drywall CalculatorSheet count for walls and ceiling, plus the screws, joint compound and tape that always get forgotten on the first trip.Wallpaper CalculatorWork out rolls from your wall dimensions and pattern repeat — the repeat is what most calculators ignore and what most people run short on.Baseboard & Trim CalculatorLinear footage and how many sticks of trim that actually means once you allow for mitre waste and doorways.Insulation CalculatorSquare footage and bag count for batt or blown-in insulation, with the R-value your climate zone actually calls for.

Exterior

Concrete CalculatorCubic yards for a slab, footing or column — and the honest bag count, so you know when to stop bagging and call a truck.Roofing CalculatorRoof area, squares and shingle bundles from your footprint and pitch — plus underlayment, ridge cap and a replacement cost range.Deck CalculatorDeck boards, joists, footings and fasteners from your deck dimensions — plus what pressure-treated versus composite really costs.Paver Patio CalculatorPaver count plus the base gravel, bedding sand and edging that make up most of the real cost of a patio.Mulch & Topsoil CalculatorCubic yards, bag count and delivered weight for mulch, topsoil, compost, gravel or sand at any depth.

Costing the whole project, not just the materials?

The renovation cost estimator covers labour, permits and contingency for twelve project types, adjusted for your region and finish level.

Renovation cost estimator