Calculator categories
Painting & Walls
Paint, wallpaper and drywall calculators for interior walls and ceilings — measure the room once and buy the right amount of everything that goes on …
Browse calculators →Floors, Tile & Roofing
Tile, grout, flooring, carpet and roofing calculators. The materials under your feet and over your head, counted by the box, bag and bundle. Flooring…
Browse calculators →Garden & Outdoor
Mulch, topsoil and gravel calculators for beds, borders, paths and driveways — volume and weight worked out before you order the load. Garden materia…
Browse calculators →Building Projects
Concrete, decking, fencing and brick calculators for the structural jobs, with the fasteners and mortar counted too. Building projects fail on the in…
Browse calculators →All calculators
Paint Calculator
Work out how many gallons or litres of paint a room needs, coat by coat.
Open calculator →Wallpaper Calculator
Estimate single rolls of wallpaper for a room, with doors and windows removed.
Open calculator →Drywall Calculator
Count drywall sheets, screws and joint compound for walls and a ceiling.
Open calculator →Tile Calculator
Find how many tiles and boxes a floor or wall needs, including cutting waste.
Open calculator →Grout Calculator
Estimate 25 lb bags of grout from tile size, joint width and area.
Open calculator →Flooring Calculator
Boxes of laminate, vinyl plank or hardwood for a room, waste included.
Open calculator →Carpet Calculator
Carpet area, square yards and roll length for standard roll widths.
Open calculator →Mulch Calculator
Cubic yards and 2 cu ft bags of mulch for beds at any depth.
Open calculator →Topsoil & Raised Bed Soil Calculator
Cubic yards and bags of soil to fill raised beds and level a garden.
Open calculator →Gravel Calculator
Cubic yards and tons of gravel for paths, driveways and drainage.
Open calculator →Concrete Bag Calculator
Cubic yards of concrete and 40, 60 and 80 lb bags for a slab or footing.
Open calculator →Deck Board Calculator
Deck boards, linear feet and a screw estimate for a rectangular deck.
Open calculator →Fence Calculator
Panels, posts, rails and concrete for a straight panel fence run.
Open calculator →Brick Calculator
Bricks and mortar bags for a wall, by brick type and wall size.
Open calculator →Roof Shingle Calculator
Roofing squares and shingle bundles from footprint and roof pitch.
Open calculator →Latest guides from the blog
The DIY Materials Checklist: Measure Twice, Order Once
A repeatable system for measuring, counting waste and ordering materials for any home project — so the job finishes in one delivery.
Read the guide →Fence Planning Guide: Posts, Panels, Boundaries and Rules
Plan a fence run properly — set-out, post depth, gravel boards, and the boundary checks to make before you dig.
Read the guide →Flooring Buying Guide: Waste, Acclimation and Underlay
How much extra flooring to buy, why acclimation matters, and the underlay decisions that decide how a floor feels.
Read the guide →Why trust these numbers?
Most calculator sites show you a box and a result, and ask you to take the result on faith. We do the opposite. Every calculator page on this site publishes the formula it uses, works a complete example by hand, lists the common mistakes that make real jobs use more material than the theory says, and answers the questions people actually ask about that material. If a manufacturer's label states different coverage for your exact product, the pages tell you how to adjust.