Paint & Wallpaper calculators
Estimate paint, primer, wallpaper rolls, pattern matching and decorative finishes.
11 calculators
Paint Calculator
Work out how much paint to buy before opening a tin. This room paint calculator separates the four walls from the ceiling, deducts the actual area of openings, and applies your chosen number of coats to both surfaces. Enter the coverage printed on your paint label rather than relying on a universal coverage claim.
Paint & WallpaperCaulk and Sealant Cartridge Calculator
Sealant quantity comes from bead cross-section multiplied by joint length. This calculator supports a rectangular joint and an ideal triangular fillet, then converts the required volume into whole cartridges. The cartridge input is explicitly US fluid ounces, which measure volume rather than mass.
Paint & WallpaperWallpaper Removal Time and Supply Calculator
Wallpaper stripping time varies with paper construction, old adhesive, painted layers, and the substrate underneath. This tool uses a removal rate from your own test patch to estimate person-hours, then calculates remover solution and concentrate separately from product coverage and dilution.
Paint & WallpaperEpoxy Floor Coating Calculator
A floor coating system can include a primer and several finish coats, each sold in a different kit size with its own spread rate. This calculator keeps those layers separate, rounds each to whole kits, and combines their costs. Enter the floor area actually being coated, rather than a flooring purchase area with cutting waste.
Paint & WallpaperWallpaper Roll Calculator
Wallpaper is purchased by the roll but installed in full-height strips. Dividing wall area by the area printed on a roll can therefore underestimate what to order. This calculator first finds how many strips cover your combined wall run, rounds each drop to the selected pattern repeat, and checks how many complete drops fit on a roll.
Paint & WallpaperPeel and Stick Wallpaper Calculator
Self-adhesive wall coverings are often supplied as fixed-height panels instead of a long traditional roll. This calculator works with that packaging: it checks panel height against the finished wall and trimming allowance, reduces useful width by any required side overlap, and counts full-height panels along the wall.
Paint & WallpaperWallpaper Pattern Repeat Calculator
Two wallpapers with the same roll area can yield different numbers of full-height drops because their patterns match differently. This calculator isolates the cutting effect of the vertical repeat. It shows the raw height plus trim, the next straight-match repeat length, and an alternating half-drop offset model.
Paint & WallpaperCeiling Paint Calculator
A sloped ceiling has more paintable surface than its horizontal footprint. This calculator supports a flat rectangle, a single sloping plane, or two symmetric pitched planes. For a symmetric pitch, the rise is measured from each eave to the center ridge and the entered span is the full room width.
Paint & WallpaperTrim and Door Paint Calculator
Trim paint is often bought in smaller containers, so a room-sized wall paint estimate is not a good fit. This tool calculates narrow trim from its total run and painted profile width, then adds rectangular door faces. Count a door twice when both faces receive the same coating.
Paint & WallpaperPrimer Coverage Calculator
A project can contain new drywall repairs alongside already painted walls, and those surfaces may consume primer at different rates. This calculator keeps the two areas separate, lets you enter a coverage value and coat count for each, and combines the resulting liquid quantities into one purchase estimate.
Paint & WallpaperCoating Mix Ratio Calculator
Some coating systems specify a base-to-hardener ratio and a permitted thinner addition. This calculator converts a desired ready-to-use batch volume into the separate component volumes. You can define thinner as a percentage of the combined base and hardener or as a percentage of base alone, which are different instructions and yield different amounts.
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Plan before you buy
How Much Paint for a Room with Doors, Windows, and Two Coats?
A useful room paint estimate begins with the surfaces receiving the same product. Floor area does not tell you wall area, and a gallon of wall paint cannot automatically stand in for a gallon of ceiling paint or primer. Build the estimate as a small schedule: wall finish, ceiling finish, trim finish, and primer.
5 min read · Project guidePaint & WallpaperHow to Calculate Wallpaper Rolls with Pattern Repeat and Full-Height Strips
Wallpaper ordering becomes much clearer when you stop treating a roll as a bag of interchangeable square feet. The useful pieces are full-height strips, and the number of strips on a roll depends on wall height, trimming, and pattern matching.
5 min read · Project guide