Know how much to buy before you drive to the store.
Free calculators for paint, drywall, flooring, tile, roofing, decks, pavers, fencing and more. Enter your measurements and get the gallons, sheets, boxes or bags to buy, and what they will cost.
Inside the house
- Square footage calculatorArea of rooms, L-shapes, circles and trianglessq ft
- Paint calculatorGallons of paint for walls and ceilingsgallons
- Drywall calculatorSheets of drywall and screws for walls and ceilingssheets
- Wallpaper calculatorRolls of wallpaper, counted strip by striprolls
- Flooring calculatorSquare feet and boxes of flooring, with wasteboxes
- Tile calculatorTiles and boxes for floors, walls and backsplashestiles
- Stair calculatorRisers, treads, total run and stringer lengthrisers
- Air conditioner size calculatorBTU rating for a window or portable AC unitBTU
Roof, yard and garden
- Roofing calculatorSquares and bundles of shingles from the house footprintsquares
- Deck board calculatorDeck boards, linear feet and screwsboards
- Paver calculatorPavers, gravel base and sand for a patiopavers
- Concrete calculatorCubic yards and bags for slabs, posts and footingsyards & bags
- Fence calculatorPosts, rails and pickets for a wood fenceposts & pickets
- Mulch calculatorCubic yards or bags of mulch for garden bedsyards & bags
- Gravel calculatorTons and cubic yards of gravel for paths and drivestons
The formula is on every page
Each calculator explains exactly how it reaches its number, so you can check the math or adjust it for your job.
Your numbers stay with you
The math runs in your browser. Measurements you type are not sent to us or stored anywhere.
Made for US projects
Feet, inches, gallons and the bag sizes you find at American hardware stores and garden centers.