Home Improvement Calculators
Stop guessing. Get the exact amount of paint, tile, concrete or flooring your project needs — in seconds.
Pick a calculator
Built for DIYers and contractors. Same formulas professionals use, with built-in waste allowances.
Paint Calculator
How many gallons of paint do I need? Enter your room size and get the exact amount, including doors, windows and coats.
Calculate →Tile Calculator
How many tiles and boxes do I need for a floor or wall? Includes waste allowance and cost estimate.
Calculate →Concrete Calculator
Cubic yards and bags needed for slabs, patios and footings. Works for any depth.
Calculate →Flooring Calculator
How many boxes of laminate, vinyl or hardwood do I need? Includes waste and box rounding.
Calculate →Wallpaper Calculator
How many double rolls of wallpaper do I need? Includes pattern repeat waste.
Calculate →Mulch Calculator
How many bags or cubic yards of mulch do I need? Includes depth and cost.
Calculate →Drywall Calculator
How many sheets of drywall do I need? Walls and ceiling, with screws and compound.
Calculate →Grout Calculator
How much grout do I need for my tile job? Works for any tile size and gap.
Calculate →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.