Plan the material, not just the shopping list.

Each project page has its own first answer, formula or decision rule, comparison table, safety boundary, and primary-source trail.

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Showing 22 projects

Paint

Interior room paint

Add the wall areas, subtract doors and windows you will not paint, multiply by the number of coats, then divide by 400 and 350 square feet per gallon to show a planning range.

Paint

Ceiling paint

For each rectangular ceiling section, multiply length by width, add the sections, multiply by coats, and divide by the cited 400-to-350-square-foot coverage range.

Paint

Exterior siding paint

Measure each exterior face, subtract large unpainted openings, multiply by coats, and divide by the general exterior range of 400 to 250 square feet per gallon.

Paint

Kitchen cabinet paint

Measure each painted face, include both sides only when both will be coated, sum the areas, multiply by coats, and run that net area through the interior paint range.

Concrete

Bagged concrete slab

Multiply slab length, width, and thickness in compatible units, add any user-selected allowance, divide by the selected bag yield, and round up to whole bags.

Concrete

Bagged concrete footing

For equal rectangular footings, multiply length × width × depth × footing count, then divide the adjusted volume by the selected bag’s cited yield and round up.

Concrete

Concrete post-hole fill

For equal cylindrical fills, use π × (diameter ÷ 2)² × concrete depth × hole count, divide by the selected bag yield, and round up.

Concrete

Concrete step volume

Model each solid rectangular portion as length × width × height, add the portions without overlap, divide by the selected bag yield, and round up.

Insulation

First inspect and air-seal the attic, identify the current insulation, choose an added R-value that exactly appears on the applicable AttiCat label, then divide attic area by that row’s maximum coverage per bag and round up.

Insulation

Attic insulation inspection

Identify the insulation, measure depth at several representative points without compressing it, note uneven or wet areas, and use the official estimated R-per-inch value only as a screening estimate.

Insulation

Attic air sealing

Inspect and address accessible air leakage and moisture pathways before adding insulation, while preserving required clearances, ventilation, and combustion safety.

Insulation

Attic hatch insulation

Calculate hatch panel area as length × width and sealable perimeter as 2 × (length + width); use those separate quantities to select label-compatible insulation and weather-sealing materials.

Drywall

Drywall panel planning

Divide net surface area by the face area of the exact panel size, round up, and then confirm the layout because an area-only count cannot account for every cut and seam.

Drywall

Drywall joint compound

USG’s FAQ estimates about two 4.5-gallon pails of the named Sheetrock UltraLightweight All Purpose Joint Compound for 1,000 square feet of gypsum board; scale that reference by board area and round purchase containers up.

Deck

Deck board planning

Use the approved deck geometry and the actual board face width plus required gap to lay out rows; calculate finish area from the faces the chosen coating system requires.

Deck

Deck finish planning

Measure only the wood faces the selected finish system calls for, then use that product’s label spread rate; do not substitute a universal deck coverage or recoat interval.

Home safety

Lead-safe renovation check

Do not start dust-producing work on suspect older paint until you have followed the applicable lead testing, certification, containment, cleanup, and verification requirements.

Home safety

Asbestos renovation check

You cannot identify asbestos by appearance alone; if renovation may disturb suspect material, stop and arrange qualified assessment or testing under the rules that apply to the property.

Home safety

U.S. mold cleanup scope

EPA says a moldy area smaller than about 10 square feet can often be handled by a homeowner, but larger areas—and sewage, HVAC contamination, major water damage, health concerns, or recurring moisture—need the relevant professional guidance.

Home safety

Canadian mould cleanup scope

Health Canada treats up to three patches with a total area no more than 1 m² as small, more than three patches or a patch over 1 but under 3 m² as medium, and a single patch over 3 m² as large and requiring professional assessment and cleanup.

Home safety

Flood cleanup plan

Before cleanup, screen electrical, structural, sewage, chemical, and combustion hazards; then inventory affected materials and begin safe drying promptly under current EPA or Health Canada guidance.

Home safety

Radon test plan

Test rather than guessing: EPA says testing is the only way to know a home’s radon level, while Health Canada calls for a long-term measurement of at least 91 days to estimate an annual average.