Interior materials come in boxes, rolls and gallons, and most come in batches that do not match perfectly across purchases. That is why running short is more expensive than a little overage. These calculators work out how many boxes, rolls or gallons to buy, including the waste factor for cuts and pattern matching.
Paint, Flooring & Walls calculators
- Paint CalculatorGallons of paint for a room, with coats, doors and windows.
- Wallpaper CalculatorRolls of wallpaper for a room, with pattern waste.
- Flooring CalculatorBoxes of laminate, vinyl plank or hardwood for a room.
- Tile CalculatorTiles, boxes, grout and thinset for a floor or wall.
- Drywall CalculatorSheets of drywall, screws, tape and joint compound.
- Lumens CalculatorHow many lumens and bulbs a room needs.
- Baseboard & Trim CalculatorLinear feet and boards of baseboard or crown molding for a room.
- Exterior House Paint CalculatorGallons of paint for the outside of a house.
Guides
- How Much Paint Do I Need? Room-by-Room GuideHow to work out how much paint to buy for walls and ceilings: the simple formula, coverage per gallon, how many coats, and a chart of common room sizes.
- How Much Tile, Grout and Thinset Do I Need?How to estimate tiles, boxes, grout and thinset for a floor, shower or backsplash, with waste factors by layout and a grout chart by tile size.
- Waste Factors Cheat Sheet: How Much Extra Material to BuyHow much extra to buy for concrete, flooring, tile, drywall, decking, shingles, paint and more, with a waste-factor table and why running short costs more.