CalcLoft
Free calculator toolkit · No sign-up

Home improvement math, solved in seconds

Get the exact amount of paint, tile, concrete, mulch — anything — for your next DIY project. 28 free calculators using the same formulas the pros use.

Browse calculators Start with a guide
28 free tools No account needed Works on mobile
Paint Calculator12 × 12 ft · 2 coats
Calculate
You need2 gallons
Free forever
Instant results
Free Tools

Find your calculator

Built for DIYers and contractors — same formulas the pros use, with built-in waste allowances.

Most popular

Paint Calculator

How many gallons of paint do I need? Includes doors, windows and coats.

Calculate

Tile Calculator

How many tiles and boxes for a floor or wall?

Calculate

Flooring Calculator

How many boxes of laminate, vinyl or hardwood?

Calculate

Concrete Calculator

Cubic yards and bags for slabs, patios, footings.

Calculate

Painting & Finishing

Paint CalculatorHow many gallons of paint do I need? Includes doors, windows and coats.Deck Stain CalculatorHow much deck stain do I need? Coats, coverage and cost.Wallpaper CalculatorHow many double rolls of wallpaper, including pattern waste?

Flooring & Tile

Tile CalculatorHow many tiles and boxes for a floor or wall?Flooring CalculatorHow many boxes of laminate, vinyl or hardwood?Grout CalculatorHow much grout for any tile size and joint width?Drywall CalculatorHow many drywall sheets, screws and compound?Carpet CalculatorHow much carpet do I need? Sq ft, square yards and cost.Board Foot CalculatorHow much lumber do I need? Board feet for any size.

Concrete & Masonry

Concrete CalculatorCubic yards and bags for slabs, patios, footings.Gravel CalculatorCubic yards, tons and bags for paths and driveways.Roofing CalculatorHow many shingle squares and bundles, with pitch.Brick CalculatorHow many bricks for a wall? Includes mortar estimate.Siding CalculatorHow much siding for a wall or whole house? In squares.Gutter CalculatorHow much gutter and how many downspouts?Rafter CalculatorHow long are my rafters? Pitch, overhang and count.Stair Stringer CalculatorCut stairs right: risers, treads and stringer length.

Outdoor & Garden

Mulch CalculatorHow many bags or yards of mulch for any bed?Sod CalculatorHow many rolls or slabs of sod for a new lawn?Fence CalculatorHow many pickets, posts and rails for a fence?Paver CalculatorHow many pavers for a patio or path? Includes base materials.Topsoil CalculatorHow much topsoil for a lawn or garden bed?Plant Spacing CalculatorHow many plants fit my garden? Grid or staggered.Deck Board CalculatorHow many deck boards do I need? Gaps and waste included.

Climate & Comfort

BTU / AC Size CalculatorWhat size air conditioner for any room?Insulation CalculatorHow much insulation and what R-value? Batts & rolls.Ceiling Fan Size CalculatorWhat blade span for any room? Mounting advice too.Water Heater Size CalculatorWhat tank size for your household? FHR included.

Guides & Articles

All guides →

Why use material calculators?

Buying too much material wastes money. Buying too little means extra trips to the store — and matching problems when you have to re-order from a different batch. Our calculators use the same formulas contractors use, with built-in waste allowances, so you order the right amount the first time.

How the calculators work

Each calculator asks a few simple measurements — room length, width, height, and openings like doors or windows. It then applies standard coverage rates and waste factors for that material. All calculations run in your browser: nothing you type is sent to a server.

Tip: always round up and add 5–10% extra. It covers mistakes, odd corners and future repairs.