Home & DIY calculators
Know how much to buy before you start the job. Each calculator turns measurements into a shopping list in purchasable units (bags, gallons, boxes, sheets), with waste allowance, US and metric units and an optional cost estimate at your own prices.
Concrete Calculator
Cubic yards and bags for slabs, footings, post holes and steps.
Paver Calculator
Pavers, gravel base, sand and edging for patios.
Paint Calculator
Gallons or liters for a room, minus doors and windows.
Drywall Calculator
Sheets, joint compound, tape and screws for a room.
Wallpaper Calculator
Rolls for a room or one wall, with pattern repeat.
Tile Calculator
Tiles and boxes for floors, walls and backsplashes.
Flooring Calculator
Boxes of laminate, vinyl plank or hardwood.
Roofing Calculator
Squares, bundles, underlayment and drip edge.
Deck Board Calculator
Deck boards, joists and screws for any deck size.
Fence Calculator
Posts, rails, pickets and post concrete.
Mulch Calculator
Cubic yards or bags for beds and tree rings.
Gravel Calculator
Cubic yards and tons for driveways and paths.
Topsoil Calculator
Cubic yards, tons or bags for lawns and beds.
Sand Calculator
Cubic yards, tons or bags for pavers and sandboxes.
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Home & DIY calculators: common questions
Why do the calculators add a waste allowance?
Cutting, breakage and pattern matching mean you always use more material than the exact area. Each calculator explains its default waste percentage, and you can change it.
Can I use metric or imperial units?
Yes. Every home calculator switches between metric and imperial and converts the values you have entered.
How many bags, tins or boxes should I buy?
Where materials are sold in packs — bags, tins, boxes, rolls or bundles — the result is rounded up to whole packs of the size you choose. Check the coverage printed on the product you buy: it varies by brand.